CVE-2026-23204

medium

Published 2026-05-20 · Modified 2026-04-02

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

—

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.5

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

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
rocky	8	fixed
rhel	9	fixed
sles		affected
rocky	9	fixed
debian	bookworm	fixed	`6.1.170-1`
debian	forky	fixed	`6.18.10-1`
debian	sid	fixed	`6.18.10-1`
debian	trixie	fixed	`6.12.73-1`
debian	bullseye	fixed	`6.1.170-1~deb11u1`
almalinux	9	fixed	`kernel-devel-5.14.0-611.45.1.el9_7.aarch64.rpm`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.