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2026-02-14 16:27CVE-2026-23204Linux
PUBLISHED5.2

net/sched: cls_u32: use skb_header_pointer_careful()

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

Affected products

Linux

Linux

< 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 - AFFECTED

< e41a23e61259f5526af875c3b86b3d42a9bae0e5 - AFFECTED

< 8a672f177ebe19c93d795fbe967846084fbc7943 - AFFECTED

< cabd1a976375780dabab888784e356f574bbaed8 - AFFECTED

Linux

2.6.35 - AFFECTED

< 2.6.35 - UNAFFECTED

<= 6.6.* - UNAFFECTED

<= 6.12.* - UNAFFECTED

<= 6.18.* - UNAFFECTED

<= * - UNAFFECTED

References

git.kernel.org

https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5

git.kernel.org

https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5

git.kernel.org

https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943

git.kernel.org

https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8

GitHub Security Advisories

GHSA-rf63-9f5h-hhg6

In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use...

https://github.com/advisories/GHSA-rf63-9f5h-hhg6

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

nvd.nist.gov

https://nvd.nist.gov/vuln/detail/CVE-2026-23204

git.kernel.org

https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5

git.kernel.org

https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943

git.kernel.org

https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8

git.kernel.org

https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5

github.com

https://github.com/advisories/GHSA-rf63-9f5h-hhg6

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-23204
Click to expand
{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-23204",
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "dateUpdated": "2026-02-14T16:27:27.708Z",
    "dateReserved": "2026-01-13T15:37:45.986Z",
    "datePublished": "2026-02-14T16:27:27.708Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux",
        "dateUpdated": "2026-02-14T16:27:27.708Z"
      },
      "title": "net/sched: cls_u32: use skb_header_pointer_careful()",
      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "affected": [
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          "product": "Linux",
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              "versionType": "original_commit_for_fix",
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          ]
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}