Vulnerability details
CVE-2026-74704
net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.2High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.19 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < a4b52612004a5639c4bfc30ba93ba414b8326e2a | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < 0c4882bff34558d8d53fb04c3e96da5c327c7dc8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < c1693b7844a6c06d31a565e5a494948034dfd235 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < cd2f1d9fe8a507c2dc86ad326fe221f121c47734 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < a1ae353d8355407c1bea971d1c1af5e7f242bb7d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < 2a33516f9ef59ad11844d4fc152f889449b5daf3 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8b7138814f29933898ecd31dfc83e35a30ee69f5 ≤ v < 2504a76e5c0694e14e15562730e1339f2d9f9458 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235
- https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a
- https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3
- https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8
- https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458
- https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734
- https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d
- https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3
Details
- Published
- 2026-08-22
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- —