CVE-2026-72057

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 v3 8.2 HIGH

8.2^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c
https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac
https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d
https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7
https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d
https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad
https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:21

Updated : 2026-08-23 13:16

NVD link : CVE-2026-72057

Mitre link : CVE-2026-72057

CVE.ORG link : CVE-2026-72057

JSON object : View

Products Affected

No product.

CWE

No CWE.

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