VulnerabilityPublished 15 Aug 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f511dd7bf6077aa7afbe72914520553fedaacbb4 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 17:04 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in f511dd7bf6077aa7afbe72914520553fedaacbb4, f1e7807df5bf2d42a40266430e9f82f37633cdcf, e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f +5

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < f511dd7bf6077aa7afbe72914520553fedaacbb4	Fixed in f511dd7bf6077aa7afbe72914520553fedaacbb4
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < f1e7807df5bf2d42a40266430e9f82f37633cdcf	Fixed in f1e7807df5bf2d42a40266430e9f82f37633cdcf
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f	Fixed in e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < bcdf3a3664f7d2c4e37e155f30f72ef33f041804	Fixed in bcdf3a3664f7d2c4e37e155f30f72ef33f041804
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < b7f97cae7ec1b6c3c32843c42be218690d310467	Fixed in b7f97cae7ec1b6c3c32843c42be218690d310467
LinuxLinux	Affected ≥ a729b7f0bd5bf4919306556aed614438f5174537, < 336c1e414fc0e9844d445174e8ada2a7dd8d1c4b	Fixed in 336c1e414fc0e9844d445174e8ada2a7dd8d1c4b

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.

References

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