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CVE-2026-74704

net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in c1693b7844a6c06d31a565e5a494948034dfd235; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in a4b52612004a5639c4bfc30ba93ba414b8326e2a; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in 0c4882bff34558d8d53fb04c3e96da5c327c7dc8; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in 2504a76e5c0694e14e15562730e1339f2d9f9458; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in cd2f1d9fe8a507c2dc86ad326fe221f121c47734; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in a1ae353d8355407c1bea971d1c1af5e7f242bb7d; From 8b7138814f29933898ecd31dfc83e35a30ee69f5 · fixed in 2a33516f9ef59ad11844d4fc152f889449b5daf3

  • Linux Linux

    4.19

  • KernelLinux

    From 4.19.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.152; From 6.7.0 · fixed in 6.12.104; From 6.13.0 · fixed in 6.18.45; From 6.19.0 · fixed in 7.1.9

References 8

git.kernel.org