# CVE-2026-72326: net/sched: cake: reject overhead values that underflow length

Status: published. Published: 2026-08-15. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- 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). Source: 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). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-06; percentile 12.54%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4 (CNA: Linux)

- https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f (CNA: Linux)

- https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841 (CNA: Linux)

- https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b (CNA: Linux)

- https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804 (CNA: Linux)

- https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5 (CNA: Linux)

- https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf (CNA: Linux)

- https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467 (CNA: Linux)

- https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-72326; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72326; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-72326; retrieved 2026-11-06; source updated Not reported

Revision: cbf3de0f78362398cafb54201f503c887a0ca244827576bd4a5a25ba563a8d91

Canonical: https://y2.dev/cve/CVE-2026-72326

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