CVE-2026-74704net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
- 8.2HighCVSS base score
- 0.44%Exploitation in 30 daysEPSS · top 61% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 55 days later
· 55 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
| NVDNVD · Received | 3.1 | High8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.44% · top 61% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Affected products
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < c1693b7844a6c06d31a565e5a494948034dfd235
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < a4b52612004a5639c4bfc30ba93ba414b8326e2a
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < 0c4882bff34558d8d53fb04c3e96da5c327c7dc8
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < 2504a76e5c0694e14e15562730e1339f2d9f9458
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < cd2f1d9fe8a507c2dc86ad326fe221f121c47734
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < a1ae353d8355407c1bea971d1c1af5e7f242bb7d
- affected 8b7138814f29933898ecd31dfc83e35a30ee69f5 – < 2a33516f9ef59ad11844d4fc152f889449b5daf3
- affected 4.19
- unaffected < 4.19
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.152 – ≤ 6.6.*
- unaffected 6.12.104 – ≤ 6.12.*
- unaffected 6.18.45 – ≤ 6.18.*
- unaffected 7.1.9 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235 (opens in a new tab)
- https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a (opens in a new tab)
- https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3 (opens in a new tab)
- https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8 (opens in a new tab)
- https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458 (opens in a new tab)
- https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734 (opens in a new tab)
- https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d (opens in a new tab)
- https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-64391 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74704)Record last updated .