CVE-2026-72057
net/sched: act_ct: preserve tc_skb_cb across defragmentation
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
0th
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().
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 15, 2026 |
| Last Updated | Aug 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
0d76daf2013ce1da20eab5e26bd81d983e1c18fb < fb080b6f54835d5d4d11ce3122800e6f0f6689e6 ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 67d6b00a54446c008f52cf70fc0c2ad0c712f85d ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 2400c4b05d58834b994500a9eec90a37db44187c ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac ec624fe740b416fb68d536b37fb8eef46f90b5c2 < b3d835407846134b0d54637c0281b39bebef831d ec624fe740b416fb68d536b37fb8eef46f90b5c2 < f7f45ceb855d9ba1cba594fb3f383255f7013fad ec624fe740b416fb68d536b37fb8eef46f90b5c2 < 9092e15defbe6c7bc241c306093ca9d358a578e7 5.15.13 < 5.15.217
Linux / Linux
5.16
References
git.kernel.org: https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6 git.kernel.org: https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d git.kernel.org: 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/b3d835407846134b0d54637c0281b39bebef831d git.kernel.org: https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad git.kernel.org: https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7