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CVE-2026-74704

Unknown

Last modified

CVE-2026-74704 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases.

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases. Depending on the system configuration, this leads either to either spamming dmesg with warnings, or a panic if panic_on_warn is set. The code already correctly skips the offending packet in the branch that triggers the warning, so the WARN_ON itself doesn't really serve any purpose. So just drop it altogether to avoid the inconvenient side effects.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < c1693b7844a6c06d31a565e5a494948034dfd235; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < a4b52612004a5639c4bfc30ba93ba414b8326e2a; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < 0c4882bff34558d8d53fb04c3e96da5c327c7dc8; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < 2504a76e5c0694e14e15562730e1339f2d9f9458; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < cd2f1d9fe8a507c2dc86ad326fe221f121c47734; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < a1ae353d8355407c1bea971d1c1af5e7f242bb7d; >= 8b7138814f29933898ecd31dfc83e35a30ee69f5, < 2a33516f9ef59ad11844d4fc152f889449b5daf3
LinuxLinux4.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74704?
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases. Depending on the system configuration, this leads either to either spamming dmesg with warnings, or a panic if panic_on_warn is set. The code already correctly skips the offending packet in the branch that triggers the warning, so the WARN_ON itself doesn't really serve any purpose. So just drop it altogether to avoid the inconvenient side effects.
How severe is CVE-2026-74704?
Severity scoring for CVE-2026-74704 is pending analysis.
How do I fix CVE-2026-74704?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST