CVE-2026-72057 (GCVE-0-2026-72057)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-10-19 21:19
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0d76daf2013ce1da20eab5e26bd81d983e1c18fb
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: ec624fe740b416fb68d536b37fb8eef46f90b5c2
Version: 5.15.13   ≤
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