Vulnerability-Lookup

GHSA-RF63-9F5H-HHG6

Vulnerability from github – Published: 2026-02-14 18:30 – Updated: 2026-02-14 18:30

Details

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

net/sched: cls_u32: use skb_header_pointer_careful()

skb_header_pointer() does not fully validate negative @offset values.

Use skb_header_pointer_careful() instead.

GangMin Kim provided a report and a repro fooling u32_classify():

BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23204"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-14T17:15:58Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_u32: use skb_header_pointer_careful()\n\nskb_header_pointer() does not fully validate negative @offset values.\n\nUse skb_header_pointer_careful() instead.\n\nGangMin Kim provided a report and a repro fooling u32_classify():\n\nBUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0\nnet/sched/cls_u32.c:221",
  "id": "GHSA-rf63-9f5h-hhg6",
  "modified": "2026-02-14T18:30:16Z",
  "published": "2026-02-14T18:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23204"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-23204 (GCVE-0-2026-23204)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-02-14 16:27

Title

net/sched: cls_u32: use skb_header_pointer_careful()

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a report and a repro fooling u32_classify(): BUG: KASAN: slab-out-of-bounds in u32_classify+0x1180/0x11b0 net/sched/cls_u32.c:221

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/13336a6239b9d7c6e…
	https://git.kernel.org/stable/c/e41a23e61259f5526…
	https://git.kernel.org/stable/c/8a672f177ebe19c93…
	https://git.kernel.org/stable/c/cabd1a976375780da…

Impacted products

Vendor

Product

Version

Linux

Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < e41a23e61259f5526af875c3b86b3d42a9bae0e5 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < 8a672f177ebe19c93d795fbe967846084fbc7943 (git)
Affected: fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d , < cabd1a976375780dabab888784e356f574bbaed8 (git)

Linux

Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 6.6.124 , ≤ 6.6.* (semver)
Unaffected: 6.12.70 , ≤ 6.12.* (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_u32.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "version": "fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d",
              "versionType": "git"
            },
            {
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          ],
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          "versions": [
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            },
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              "version": "0",
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    "datePublished": "2026-02-14T16:27:27.708Z",
    "dateReserved": "2026-01-13T15:37:45.986Z",
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    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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-RF63-9F5H-HHG6

CVE-2026-23204 (GCVE-0-2026-23204)

Tags

Sightings

Nomenclature