CVEvulnerability
CVE-2026-72057
8.2 HIGH
Official page ↗
- Status
- Received
- Published
- 2026-08-15
- Last modified
- 2026-10-19
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 8.2 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weaknesses
- CWE-662
Description
In the Linux kernel, the following vulnerability has been resolved:
net/sched: act_ct: preserve tc_skb_cb across defragmentation
tcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving
and restoring skb->cb. The defrag helper clears IPCB/IP6CB, which aliases
the tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through
act_ct therefore loses qdisc metadata such as pkt_segs and can trigger
WARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled.
Save and restore the full tc_skb_cb around nf_ct_handle_fragments(),
matching the pattern used by ovs_ct_handle_fragments().
Related
Weakness · CWE (1)
- CWE-662 Improper Synchronization weakness
References
- https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c git.kernel.org
- https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac git.kernel.org
- https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d git.kernel.org
- https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7 git.kernel.org
- https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d git.kernel.org
- https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad git.kernel.org
- https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6 git.kernel.org