CVE-2026-72326
net/sched: cake: reject overhead values that underflow length
In the Linux kernel, the following vulnerability has been resolved: net/sched: cake: reject overhead values that underflow length CAKE accepts signed overhead values and stores them in an s16, but the adjusted packet length calculation uses unsigned arithmetic. A negative effective length can therefore wrap to a large value. Such configurations make rate accounting depend on integer wraparound rather than on the packet size userspace intended to model. A static netlink lower bound is not enough because packets reaching CAKE can be smaller than any reasonable manual-overhead allowance. Fold the signed overhead adjustment into the existing datapath MPU clamp so negative adjusted lengths are clamped before link-layer framing adjustments.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ a729b7f0bd5bf4919306556aed614438f5174537; < f511dd7bf6077aa7afbe72914520553fedaacbb4 (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < 297f459865360b46a887667cbf3aac6a6f013841 (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < 336c1e414fc0e9844d445174e8ada2a7dd8d1c4b (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < bcdf3a3664f7d2c4e37e155f30f72ef33f041804 (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < 7aa0e64fea778a9e3df73e64da95367ff8ad2ea5 (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < f1e7807df5bf2d42a40266430e9f82f37633cdcf (affected, git) ≥ a729b7f0bd5bf4919306556aed614438f5174537; < b7f97cae7ec1b6c3c32843c42be218690d310467 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.19 (affected) ≥ 0; < 4.19 (unaffected, semver) ≥ 5.10.261; ≤ 5.10.* (unaffected, semver) ≥ 5.15.212; ≤ 5.15.* (unaffected, semver) ≥ 6.1.178; ≤ 6.1.* (unaffected, semver) ≥ 6.6.145; ≤ 6.6.* (unaffected, semver) ≥ 6.12.97; ≤ 6.12.* (unaffected, semver) ≥ 6.18.40; ≤ 6.18.* (unaffected, semver) ≥ 7.1.5; ≤ 7.1.* (unaffected, semver) ≥ 7.2; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4CNA: Linux
- https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6fCNA: Linux
- https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841CNA: Linux
- https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4bCNA: Linux
- https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804CNA: Linux
- https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5CNA: Linux
- https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcfCNA: Linux
- https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467CNA: Linux
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