Answer in brief
CVE-2026-74704 records a High severity (CVSS 8.2) vulnerability in net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <c1693b7844a6c06d31a565e5a494948034dfd235 || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <a4b52612004a5639c4bfc30ba93ba414b8326e2a || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3 || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <0c4882bff34558d8d53fb04c3e96da5c327c7dc8 || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <2504a76e5c0694e14e15562730e1339f2d9f9458 || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <cd2f1d9fe8a507c2dc86ad326fe221f121c47734 || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <a1ae353d8355407c1bea971d1c1af5e7f242bb7d || >=8b7138814f29933898ecd31dfc83e35a30ee69f5 <2a33516f9ef59ad11844d4fc152f889449b5daf3 | c1693b7844a6c06d31a565e5a494948034dfd235, a4b52612004a5639c4bfc30ba93ba414b8326e2a, ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3, 0c4882bff34558d8d53fb04c3e96da5c327c7dc8, 2504a76e5c0694e14e15562730e1339f2d9f9458, cd2f1d9fe8a507c2dc86ad326fe221f121c47734, a1ae353d8355407c1bea971d1c1af5e7f242bb7d, 2a33516f9ef59ad11844d4fc152f889449b5daf3 |
| Linux/Linuxgeneric | 4.19 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.