CVE-2026-72057net/sched: act_ct: preserve tc_skb_cb across defragmentation
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0d76daf2013ce1da20eab5e26bd81d983e1c18fb before fb080b6f54835d5d4d11ce3122800e6f0f6689e6; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before 67d6b00a54446c008f52cf70fc0c2ad0c712f85d; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before 2400c4b05d58834b994500a9eec90a37db44187c; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before b3d835407846134b0d54637c0281b39bebef831d; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before f7f45ceb855d9ba1cba594fb3f383255f7013fad; from ec624fe740b416fb68d536b37fb8eef46f90b5c2 before 9092e15defbe6c7bc241c306093ca9d358a578e7; from 5.15.13 before 5.15.217 | CNA record |
References
- https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6
- https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d
- https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c
- https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac
- https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d
- https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad
- https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.