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VULNERABILITIES

CVE-2026-72057 Details

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().

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: kernel.orgCVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c kernel.org
https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac kernel.org
https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d kernel.org
https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7 kernel.org
https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d kernel.org

see all 7 references

Weakness Enumeration

No weakness enumeration is available for this CVE.

Affected Products

No affected product data is available for this CVE.

Change History

3 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-72057
NVD Published Date:
Aug 15, 2026
NVD Last Modified:
Aug 23, 2026
Source:
kernel.org
CVE-2026-72057 Details - Not Deferred