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CVE-2026-99226

keys: Avoid the owner account dereference in named keyring lookup

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 06/11/2026, 21:10:31 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

The Linux kernel is vulnerable due to a use-after-free bug in named keyring lookup. Affected versions include those before specific git commits. The vulnerability allows reading freed memory.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

9 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

2ea190d0a006ce5218baa6e798512652446a605a → before 77249d4b1bb5ad43552b7023c4a0978937aa7a56

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before 0b865fa477d94ac96c26848aab1fd176397de3f6

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before 6763329f673d261641c79212abf773af77b2c922

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before aa03c8fb4334f14d218020f7431debf2b7766865

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before c9664f780f861dd9f11f120c7a03ed0993671ebb

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before b0830a26e2c3008a6e21863126b4a0e68b2761cd

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before 5c6a9512887a6cc694d594d9c0b57c0841d215b5

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before 40b12b93ae4ab9e22c3d571e9b09fd08afad53f6

git versions

2ea190d0a006ce5218baa6e798512652446a605a → before 51409aaa01f8602552c336009fd22b226b0cdf1d

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

11 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

2.6.30

unaffected

0 → before 2.6.30

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.161 → through 6.6.*

semver versions

6.12.115 → through 6.12.*

semver versions

6.18.60 → through 6.18.*

semver versions

7.2.14 → through 7.2.*

semver versions

7.3.1 → through 7.3.*

semver versions

7.4-rc1 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

keys: Avoid the owner account dereference in named keyring lookup

Named keyring lookup must keep the storage containing the owner UID alive through the namespace mapping check. find_keyring_by_name() reads keyring->user->uid under keyring_name_lock, but that lock protects the keyring's name entry and allocation, not its separate key_user.

A named session-keyring join can overlap a privileged KEYCTL_CHOWN on another CPU. If the keyring holds the last reference to its old dynamic key_user and the ownership transfer succeeds, the following ordering is possible:

Named join                         Chown
find_keyring_by_name()              keyctl_chown_key()
  read_lock(keyring_name_lock)       down_write(key->sem)
  load old keyring->user
                                     replace key->user and key->uid
                                     up_write(key->sem)
                                     key_put(key)
                                     key_user_put(old user): free
  read old user->uid
  read_unlock(keyring_name_lock)

Chown neither takes keyring_name_lock nor key_session_mutex, so it can free the old account between the pointer load and the UID read. The lookup then reads freed memory even though the keyring itself is alive.

Use keyring->uid for the mapping check. key_alloc() initializes this inline owner UID and keyctl_chown_key() updates it on chown. The existing name lock keeps its containing keyring allocated throughout the check, so lookup no longer depends on the account's lifetime. This also matches the owner UID used by the permission check.

KASAN report as below:

BUG: KASAN: slab-use-after-free in find_keyring_by_name+0x577/0x5d0
Read of size 4 at addr ffff8881128ae2ec by task keycase/500

References

9 sources
git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56
Source referenceLinux
git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6
Source referenceLinux
git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922
Source referenceLinux
git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865
Source referenceLinux
git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb
Source referenceLinux
git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd
Source referenceLinux
View 3 more references
git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5
Source referenceLinux
git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6
Source referenceLinux
git.kernel.org/stable/c/51409aaa01f8602552c336009fd22b226b0cdf1d
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-99226

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 6.6.161

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 6.12.115

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 6.18.60

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 7.2.14

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 7.3.1

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 2.6.30

Before: 7.4-rc1

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "5.10.273"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "5.15.224"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "6.6.161"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "6.12.115"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "6.18.60"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "7.2.14"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "7.3.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.6.30",
            "versionEndExcluding": "7.4-rc1"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-11-03

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-99226

    Observed 2026-11-03T19:50:23.330Z · upstream updated 2026-11-03T19:12:58.803Z

    Product or version evidence changed

    before

    [
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "77249d4b1bb5ad43552b7023c4a0978937aa7a56",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "0b865fa477d94ac96c26848aab1fd176397de3f6",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "6763329f673d261641c79212abf773af77b2c922",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "aa03c8fb4334f14d218020f7431debf2b7766865",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "c9664f780f861dd9f11f120c7a03ed0993671ebb",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "b0830a26e2c3008a6e21863126b4a0e68b2761cd",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "5c6a9512887a6cc694d594d9c0b57c0841d215b5",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "40b12b93ae4ab9e22c3d571e9b09fd08afad53f6",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99226"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2.6.30",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "2.6.30",
        "versionType": "semver"
      },
      {
        "version": "5.10.273",
        "status": "unaffected",
        "lessThanOrEqual": "5.10.*",
        "versionType": "semver"
      },
      {
        "version": "5.15.224",
        "status": "unaffected",
        "lessThanOrEqual": "5.15.*",
        "versionType": "semver"
      },
      {
        "version": "6.1.191",
        "status": "unaffected",
        "lessThanOrEqual": "6.1.*",
        "versionType": "semver"
      },
      {
        "version": "6.6.161",
        "status": "unaffected",
        "lessThanOrEqual": "6.6.*",
        "versionType": "semver"
      },
      {
        "version": "6.12.115",
        "status": "unaffected",
        "lessThanOrEqual": "6.12.*",
        "versionType": "semver"
      },
      {
        "version": "6.18.60",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.1",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99226"
  }
]

    after

    [
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "77249d4b1bb5ad43552b7023c4a0978937aa7a56",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "0b865fa477d94ac96c26848aab1fd176397de3f6",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "6763329f673d261641c79212abf773af77b2c922",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "aa03c8fb4334f14d218020f7431debf2b7766865",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "c9664f780f861dd9f11f120c7a03ed0993671ebb",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "b0830a26e2c3008a6e21863126b4a0e68b2761cd",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "5c6a9512887a6cc694d594d9c0b57c0841d215b5",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "40b12b93ae4ab9e22c3d571e9b09fd08afad53f6",
        "versionType": "git"
      },
      {
        "version": "2ea190d0a006ce5218baa6e798512652446a605a",
        "status": "affected",
        "lessThan": "51409aaa01f8602552c336009fd22b226b0cdf1d",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99226"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "2.6.30",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "2.6.30",
        "versionType": "semver"
      },
      {
        "version": "5.10.273",
        "status": "unaffected",
        "lessThanOrEqual": "5.10.*",
        "versionType": "semver"
      },
      {
        "version": "5.15.224",
        "status": "unaffected",
        "lessThanOrEqual": "5.15.*",
        "versionType": "semver"
      },
      {
        "version": "6.1.191",
        "status": "unaffected",
        "lessThanOrEqual": "6.1.*",
        "versionType": "semver"
      },
      {
        "version": "6.6.161",
        "status": "unaffected",
        "lessThanOrEqual": "6.6.*",
        "versionType": "semver"
      },
      {
        "version": "6.12.115",
        "status": "unaffected",
        "lessThanOrEqual": "6.12.*",
        "versionType": "semver"
      },
      {
        "version": "6.18.60",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.2.14",
        "status": "unaffected",
        "lessThanOrEqual": "7.2.*",
        "versionType": "semver"
      },
      {
        "version": "7.3.1",
        "status": "unaffected",
        "lessThanOrEqual": "7.3.*",
        "versionType": "semver"
      },
      {
        "version": "7.4-rc1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99226"
  }
]
    References changed

    before

    [
  "https://git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56",
  "https://git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6",
  "https://git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922",
  "https://git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865",
  "https://git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb",
  "https://git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd",
  "https://git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5",
  "https://git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6"
]

    after

    [
  "https://git.kernel.org/stable/c/77249d4b1bb5ad43552b7023c4a0978937aa7a56",
  "https://git.kernel.org/stable/c/0b865fa477d94ac96c26848aab1fd176397de3f6",
  "https://git.kernel.org/stable/c/6763329f673d261641c79212abf773af77b2c922",
  "https://git.kernel.org/stable/c/aa03c8fb4334f14d218020f7431debf2b7766865",
  "https://git.kernel.org/stable/c/c9664f780f861dd9f11f120c7a03ed0993671ebb",
  "https://git.kernel.org/stable/c/b0830a26e2c3008a6e21863126b4a0e68b2761cd",
  "https://git.kernel.org/stable/c/5c6a9512887a6cc694d594d9c0b57c0841d215b5",
  "https://git.kernel.org/stable/c/40b12b93ae4ab9e22c3d571e9b09fd08afad53f6",
  "https://git.kernel.org/stable/c/51409aaa01f8602552c336009fd22b226b0cdf1d"
]
    Environment requirements changed

    before

    [
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "5.10.273"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "5.15.224"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "6.1.191"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "6.6.161"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "6.12.115"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "6.18.60"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "7.3.1"
              }
            ]
          }
        ]
      }
    ]
  }
]

    after

    [
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "5.10.273"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "5.15.224"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
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              },
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                "vulnerable": true,
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                "vulnerable": true,
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              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "2.6.30",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
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              },
              {
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                "versionEndExcluding": "7.4-rc1"
              }
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        ]
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    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.