CVE-2026-23204

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

CVSS 3.1

7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-02-14

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/13336a6239b9d7c6e61483017bb8bdfe3ceb10a5
• https://git.kernel.org/stable/c/29681ed51e737be14d18ecd1c304c57002e4b72c
• https://git.kernel.org/stable/c/66e4b63d61c15de6ca5332d9ca6db59a404d7136
• https://git.kernel.org/stable/c/8a672f177ebe19c93d795fbe967846084fbc7943
• https://git.kernel.org/stable/c/cabd1a976375780dabab888784e356f574bbaed8

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