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CVE-2026-72057

8.2 · HIGH

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 s…

Published Aug 15, 2026EPSS 0.58%

Overview

CVE-2026-72057 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187cRefgit.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bacRefgit.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85dRefgit.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7Refgit.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831dRefgit.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fadRefgit.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72057?

CVE-2026-72057 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-72057?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72057?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72057?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72057 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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