What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

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.

Affected products

• Linux kernel: 4.19 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841
• https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b
• https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5
• https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467
• https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804
• https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f
• https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf
• https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4

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