CVE-2026-99270

tcp: Fix potential UAF in reqsk_timer_handler().

Products / packages Linux

Published 03/11/2026, 12:32:09 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

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

Linux · CVSS:3.1 · 8.1

Assessment vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity

high8.1

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

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

Source excerpt · Linux

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

4 ranges

Linux version evidence

Check a product version

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

affected

83fccfc3940c4a2db90fd7e7079f5b465cd8c6af → before b3b56e95f6fad7fa7281450b443e861d82616fdb

git versions

83fccfc3940c4a2db90fd7e7079f5b465cd8c6af → before 97c8a3c1f73d828de43a5a88e8a9a143efb2b661

git versions

d3a1196bfc462943694623412d8e03aaf172bdc1

git versions

4.1.11 → before 4.2

semver versions

Other versions: unaffected

Linux · Linux

Linux

4 ranges

Linux version evidence

Check a product version

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

affected

4.2

unaffected

0 → before 4.2

semver versions

6.18.61 → through 6.18.*

semver versions

7.1 → through *

original_commit_for_fix versions

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:

tcp: Fix potential UAF in reqsk_timer_handler().

When TCP socket migration fails at inet_ehash_insert() in reqsk_timer_handler(), we jump to the no_ownership: label and free the new reqsk immediately with __reqsk_free().

Thus, we must stop the new reqsk's timer before jumping to the label, but the timer might be missed since the cited commit, resulting in UAF.

As we are in the original reqsk's timer context, we can safely call timer_delete_sync() for the new reqsk.

Let's pass false to __inet_csk_reqsk_queue_drop() to stop the new reqsk's timer.

References

2 sources

git.kernel.org/stable/c/b3b56e95f6fad7fa7281450b443e861d82616fdb

Source referenceLinux

git.kernel.org/stable/c/97c8a3c1f73d828de43a5a88e8a9a143efb2b661

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-2026-99270

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): 4.2

After:

Through (inclusive):

Before: 6.18.61

Vulnerable product

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

From (inclusive): 4.2

After:

Through (inclusive):

Before: 7.1

Vulnerable product

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

From (inclusive): 4.1.11

After:

Through (inclusive):

Before:

Original applicability statements

[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.2",
            "versionEndExcluding": "6.18.61"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.2",
            "versionEndExcluding": "7.1"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.1.11"
          }
        ]
      }
    ]
  }
]

Contributing organizations · 1

Linux

Assigning organization

2026-11-06

Timeline

All times UTC

3 Nov 2026, 12:32
Advisory published
Publication date supplied by the source.
6 Nov 2026, 17:15
Source updated
Latest modification date supplied by the source.
6 Nov 2026, 17:59
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-992702026-11-06

Observed 2026-11-06T17:59:08.358Z · upstream updated 2026-11-06T17:15:14.125Z

Product or version evidence changed

before

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "83fccfc3940c4a2db90fd7e7079f5b465cd8c6af",
        "status": "affected",
        "lessThan": "97c8a3c1f73d828de43a5a88e8a9a143efb2b661",
        "versionType": "git"
      },
      {
        "version": "d3a1196bfc462943694623412d8e03aaf172bdc1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "4.1.11",
        "status": "affected",
        "lessThan": "4.2",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99270"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.2",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99270"
  }
]

after

[
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "83fccfc3940c4a2db90fd7e7079f5b465cd8c6af",
        "status": "affected",
        "lessThan": "b3b56e95f6fad7fa7281450b443e861d82616fdb",
        "versionType": "git"
      },
      {
        "version": "83fccfc3940c4a2db90fd7e7079f5b465cd8c6af",
        "status": "affected",
        "lessThan": "97c8a3c1f73d828de43a5a88e8a9a143efb2b661",
        "versionType": "git"
      },
      {
        "version": "d3a1196bfc462943694623412d8e03aaf172bdc1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "4.1.11",
        "status": "affected",
        "lessThan": "4.2",
        "versionType": "semver"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99270"
  },
  {
    "vendor": "Linux",
    "name": "Linux",
    "platforms": [],
    "versions": [
      {
        "version": "4.2",
        "status": "affected"
      },
      {
        "version": "0",
        "status": "unaffected",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "version": "6.18.61",
        "status": "unaffected",
        "lessThanOrEqual": "6.18.*",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "status": "unaffected",
        "lessThanOrEqual": "*",
        "versionType": "original_commit_for_fix"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [],
    "source": "Linux",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-99270"
  }
]

References changed

before

[
  "https://git.kernel.org/stable/c/97c8a3c1f73d828de43a5a88e8a9a143efb2b661"
]

after

[
  "https://git.kernel.org/stable/c/b3b56e95f6fad7fa7281450b443e861d82616fdb",
  "https://git.kernel.org/stable/c/97c8a3c1f73d828de43a5a88e8a9a143efb2b661"
]

Environment requirements changed

before

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.2",
                "versionEndExcluding": "7.1"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.1.11"
              }
            ]
          }
        ]
      }
    ]
  }
]

after

[
  {
    "source": "Linux",
    "statements": [
      {
        "nodes": [
          {
            "operator": "OR",
            "negate": false,
            "cpeMatch": [
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.2",
                "versionEndExcluding": "6.18.61"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.2",
                "versionEndExcluding": "7.1"
              },
              {
                "vulnerable": true,
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "versionStartIncluding": "4.1.11"
              }
            ]
          }
        ]
      }
    ]
  }
]

CVE · CVE-2026-992702026-11-03
Observed 2026-11-03T19:51:28.231Z · upstream updated 2026-11-03T19:14:43.225Z
Severity assessment changed
before
[]
after
[ { "source": "Linux", "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "score": 8.1 } ]

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

Showing up to 50 most recent observed changes.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-99270

Enrichment coverage

NVDNo result

Checked 03/11/2026, 12:45:35 UTC

GHSANo result

Checked 03/11/2026, 12:45:35 UTC

EUVDNo result

Checked 03/11/2026, 12:45:36 UTC

EPSSNo result

Checked 03/11/2026, 12:45:36 UTC

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Investigate in your agent.

tcp: Fix potential UAF in reqsk_timer_handler().

Severity and exploitation

What this means

Attack conditions

Affected versions

Linux

affected

unaffected

unknown

Linux

affected

unaffected

unknown

What to do

Public exploit evidence

Original source description

References

Inside the record

Evidence available

Original records

Environment requirements

Timeline

Advisory published

Source updated

Last imported by cve.new

What changed