Bug 2439931 (CVE-2026-23204) - CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful()
Summary: CVE-2026-23204 kernel: net/sched: cls_u32: use skb_header_pointer_careful()
Keywords:
Status: NEW
Alias: CVE-2026-23204
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-14 17:03 UTC by OSIDB Bzimport
Modified: 2026-02-17 14:50 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-02-14 17:03:39 UTC 
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
Comment 1 TEJ RATHI 2026-02-16 06:36:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021437-CVE-2026-23204-be85@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.