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

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d affected < 13336a6239b9d7c6e61483017bb8bdfe3ceb10a5
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d affected < e41a23e61259f5526af875c3b86b3d42a9bae0e5
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d affected < 8a672f177ebe19c93d795fbe967846084fbc7943
fbc2e7d9cf49e0bf89b9e91fd60a06851a855c5d affected < cabd1a976375780dabab888784e356f574bbaed8
Linux Linux affected
Version Status Constraints
2.6.35 affected —
0 unaffected < 2.6.35
6.6.124 unaffected ≤ 6.6.*
6.12.70 unaffected ≤ 6.12.*
6.18.10 unaffected ≤ 6.18.*
6.19 unaffected ≤ *

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Fixes

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Workaround

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References
Link Providers
https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5 cve-icon cve-icon
https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943 cve-icon cve-icon
https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8 cve-icon cve-icon
https://git.kernel.org/stable/c/e41a23e61259f5526af875c3b86b3d42a9bae0e5 cve-icon cve-icon
History

Sat, 14 Feb 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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
Title net/sched: cls_u32: use skb_header_pointer_careful()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-02-14T16:27:27.708Z

Reserved: 2026-01-13T15:37:45.986Z

Link: CVE-2026-23204

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-02-14T17:15:58.297

Modified: 2026-02-14T17:15:58.297

Link: CVE-2026-23204

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses

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