Vulnerability-Lookup

GHSA-CR2W-747Q-47QC

Vulnerability from github – Published: 2026-06-16 09:32 – Updated: 2026-06-19 15:33

Details

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

net/sched: fix pedit partial COW leading to page cache corruption

tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd.

Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46331"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-16T08:16:23Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix pedit partial COW leading to page cache corruption\n\ntcf_pedit_act() computes the COW range for skb_ensure_writable()\nonce before the key loop using tcfp_off_max_hint, but the hint does\nnot account for the runtime header offset added by typed keys. This\ncan leave part of the write region un-COW\u0027d.\n\nFix by moving skb_ensure_writable() inside the per-key loop where\nthe actual write offset is known, and add overflow checking on the\noffset arithmetic. For negative offsets (e.g. Ethernet header edits\nat ingress), use skb_cow() to COW the headroom instead. Guard\noffset_valid() against INT_MIN, where negation is undefined.",
  "id": "GHSA-cr2w-747q-47qc",
  "modified": "2026-06-19T15:33:15Z",
  "published": "2026-06-16T09:32:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46331"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3dee9d0c198faeb95d052c1b94c2958751a28512"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/899ee91156e57784090c5565e4f31bd7dbffbc5a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b198ed4e52580a7238c7c7082f03906f8b310313"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46331 (GCVE-0-2026-46331)

Vulnerability from cvelistv5 – Published: 2026-06-16 06:26 – Updated: 2026-06-19 12:00

Title

net/sched: fix pedit partial COW leading to page cache corruption

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: fix pedit partial COW leading to page cache corruption tcf_pedit_act() computes the COW range for skb_ensure_writable() once before the key loop using tcfp_off_max_hint, but the hint does not account for the runtime header offset added by typed keys. This can leave part of the write region un-COW'd. Fix by moving skb_ensure_writable() inside the per-key loop where the actual write offset is known, and add overflow checking on the offset arithmetic. For negative offsets (e.g. Ethernet header edits at ingress), use skb_cow() to COW the headroom instead. Guard offset_valid() against INT_MIN, where negation is undefined.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/2bec122b9fb91507a…
https://git.kernel.org/stable/c/b198ed4e52580a723…
https://git.kernel.org/stable/c/3dee9d0c198faeb95…
https://git.kernel.org/stable/c/899ee91156e577840…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8b796475fd7882663a870456466a4fb315cc1bd6 , < 2bec122b9fb91507a758ab5e3e5c4fbe7cb3f61b (git) Affected: 8b796475fd7882663a870456466a4fb315cc1bd6 , < b198ed4e52580a7238c7c7082f03906f8b310313 (git) Affected: 8b796475fd7882663a870456466a4fb315cc1bd6 , < 3dee9d0c198faeb95d052c1b94c2958751a28512 (git) Affected: 8b796475fd7882663a870456466a4fb315cc1bd6 , < 899ee91156e57784090c5565e4f31bd7dbffbc5a (git) Affected: d0c38a914b0c4c21d553da801003d36979016726 (git) Affected: 2ec2dd7d51a9320151f275ddbb2b53260fb32ca1 (git) Affected: abe35bf3be51482593076d516a680d79e5fbc8e1 (git) Affected: b773640d5bb9e2acfd91e2695717af04d47aa116 (git) Affected: c19cc520b3d69904e9518d401ad0df7f4702aca0 (git) Affected: 4.19.244 , < 4.20 (semver) Affected: 5.4.195 , < 5.5 (semver) Affected: 5.10.117 , < 5.11 (semver) Affected: 5.15.41 , < 5.16 (semver) Affected: 5.17.9 , < 5.18 (semver)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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              "status": "affected",
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              "versionType": "semver"
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              "status": "affected",
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              "status": "affected",
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              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "5.17.9",
              "versionType": "semver"
            }
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        },
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          "programFiles": [
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            "net/sched/act_pedit.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fix pedit partial COW leading to page cache corruption\n\ntcf_pedit_act() computes the COW range for skb_ensure_writable()\nonce before the key loop using tcfp_off_max_hint, but the hint does\nnot account for the runtime header offset added by typed keys. This\ncan leave part of the write region un-COW\u0027d.\n\nFix by moving skb_ensure_writable() inside the per-key loop where\nthe actual write offset is known, and add overflow checking on the\noffset arithmetic. For negative offsets (e.g. Ethernet header edits\nat ingress), use skb_cow() to COW the headroom instead. Guard\noffset_valid() against INT_MIN, where negation is undefined."
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    "datePublished": "2026-06-16T06:26:21.066Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-CR2W-747Q-47QC

CVE-2026-46331 (GCVE-0-2026-46331)

Tags

Sightings

Nomenclature