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CVE-2026-99220

asymmetric_keys: reject trust keys without IDs

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 to a NULL pointer dereference when an unprivileged caller supplies a PKCS#8 key without IDs to a key_or_keyring restriction. Affected versions include Linux kernel versions starting from 4.20. The vulnerability can cause a general protection fault and kernel panic.

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

7 ranges
Linux version evidence

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

affected

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 889a2293a95f6c2880bf73b67f9b0af23251a128

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 7f0728ba89624e25df2bb80ff59bbfb545060935

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 2a40bdd4409567de4c2a141ac66439dc238af752

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 1aa0c7aa4c2554a5b6d74ae1924508ca4718234b

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 33a078f04e264eb71aa9f209cb334e4010123818

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 57e54b6939c6539d90a81c7e57531901d5991651

git versions

3c58b2362ba828ee2970c66c6a6fd7b04fde4413 → before 9695df3b1db4ac4534274d38ee16e3b9b0bf910e

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

9 ranges
Linux version evidence

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

affected

4.20

unaffected

0 → before 4.20

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:

asymmetric_keys: reject trust keys without IDs

The PKCS#8 parser deliberately leaves the asym_key_ids payload slot empty. key_or_keyring_common() unconditionally dereferences that slot when a PKCS#8 key is supplied to a key_or_keyring restriction. Both the plain and :chain forms reach this branch, allowing an unprivileged caller to trigger a NULL pointer dereference through KEYCTL_RESTRICT_KEYRING followed by add_key().

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:key_or_keyring_common (crypto/asymmetric_keys/restrict.c:205 crypto/asymmetric_keys/restrict.c:279) Call Trace: <TASK> __key_create_or_update (security/keys/key.c:884) key_create_or_update (security/keys/key.c:1021) __do_sys_add_key (security/keys/keyctl.c:134) do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Kernel panic - not syncing: Fatal exception

Reject an asymmetric restriction key without key IDs. A PKCS#8 private key cannot identify the signer of a candidate certificate and is not a valid trust anchor.

References

7 sources
git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128
Source referenceLinux
git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935
Source referenceLinux
git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752
Source referenceLinux
git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b
Source referenceLinux
git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818
Source referenceLinux
git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651
Source referenceLinux
View 1 more references
git.kernel.org/stable/c/9695df3b1db4ac4534274d38ee16e3b9b0bf910e
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-2026-99220

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): 4.20

Before: 6.1.191

Vulnerable product

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

From (inclusive): 4.20

Before: 6.6.161

Vulnerable product

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

From (inclusive): 4.20

Before: 6.12.115

Vulnerable product

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

From (inclusive): 4.20

Before: 6.18.60

Vulnerable product

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

From (inclusive): 4.20

Before: 7.2.14

Vulnerable product

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

From (inclusive): 4.20

Before: 7.3.1

Vulnerable product

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

From (inclusive): 4.20

Before: 7.4-rc1

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "6.1.191"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "6.6.161"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "6.12.115"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "6.18.60"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "7.2.14"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "versionEndExcluding": "7.3.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.20",
            "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-2026-99220

    Observed 2026-11-03T19:48:19.241Z · upstream updated 2026-11-03T19:12:54.971Z

    Product or version evidence changed

    before

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        "versionType": "git"
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      {
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        "lessThan": "7f0728ba89624e25df2bb80ff59bbfb545060935",
        "versionType": "git"
      },
      {
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        "lessThan": "2a40bdd4409567de4c2a141ac66439dc238af752",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
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      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
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        "status": "affected",
        "lessThan": "57e54b6939c6539d90a81c7e57531901d5991651",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99220"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.20",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.20",
        "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-2026-99220"
  }
]

    after

    [
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "889a2293a95f6c2880bf73b67f9b0af23251a128",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "7f0728ba89624e25df2bb80ff59bbfb545060935",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "2a40bdd4409567de4c2a141ac66439dc238af752",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "1aa0c7aa4c2554a5b6d74ae1924508ca4718234b",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "33a078f04e264eb71aa9f209cb334e4010123818",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "57e54b6939c6539d90a81c7e57531901d5991651",
        "versionType": "git"
      },
      {
        "version": "3c58b2362ba828ee2970c66c6a6fd7b04fde4413",
        "status": "affected",
        "lessThan": "9695df3b1db4ac4534274d38ee16e3b9b0bf910e",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99220"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.20",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.20",
        "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-2026-99220"
  }
]
    References changed

    before

    [
  "https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128",
  "https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935",
  "https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752",
  "https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b",
  "https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818",
  "https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651"
]

    after

    [
  "https://git.kernel.org/stable/c/889a2293a95f6c2880bf73b67f9b0af23251a128",
  "https://git.kernel.org/stable/c/7f0728ba89624e25df2bb80ff59bbfb545060935",
  "https://git.kernel.org/stable/c/2a40bdd4409567de4c2a141ac66439dc238af752",
  "https://git.kernel.org/stable/c/1aa0c7aa4c2554a5b6d74ae1924508ca4718234b",
  "https://git.kernel.org/stable/c/33a078f04e264eb71aa9f209cb334e4010123818",
  "https://git.kernel.org/stable/c/57e54b6939c6539d90a81c7e57531901d5991651",
  "https://git.kernel.org/stable/c/9695df3b1db4ac4534274d38ee16e3b9b0bf910e"
]
    Environment requirements changed

    before

    [
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
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              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.1.191"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.6.161"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.12.115"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.18.60"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "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": "4.20",
                "versionEndExcluding": "6.1.191"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.6.161"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.12.115"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "6.18.60"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "7.2.14"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "7.3.1"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.20",
                "versionEndExcluding": "7.4-rc1"
              }
            ]
          }
        ]
      }
    ]
  }
]

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

Showing up to 50 most recent observed changes.