VulnerabilityPublished 28 Oct 2026

CVE-2026-99112: Linux kernel · net/sched: cls_flower: validate mask pointer after nla_next()

Source GCVE Database

Authoritative record:CVE-2026-99112

Not known to be exploited · fixed in fee10655709c5c597e8e9f722f3035d9ea31ff3a : update Linux kernel when convenient.

Data as of 28 Oct 2026, 14:15 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in fee10655709c5c597e8e9f722f3035d9ea31ff3a, bb187146c7e5c666874784e4f3fc1bc5126e6e92, 45e60747a9db2307929260d9aa9c1c6cbb70ee77 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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.

ghsa-mhx6-cq85-vmgg

What to do

Upgrade Linux kernel to fee10655709c5c597e8e9f722f3035d9ea31ff3a, bb187146c7e5c666874784e4f3fc1bc5126e6e92, 45e60747a9db2307929260d9aa9c1c6cbb70ee77 or 5.11.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=5.10.11 <5.11	Fixed in fee10655709c5c597e8e9f722f3035d9ea31ff3a bb187146c7e5c666874784e4f3fc1bc5126e6e92 45e60747a9db2307929260d9aa9c1c6cbb70ee77 5.11
LinuxLinux	Affected =5.11	Fixed in–

AI-suggested

A fix has been implemented that validates the advanced mask pointer after nla_next(). Filters with invalid mask pointers are rejected with -EINVAL, preventing out-of-bounds reads. Users should apply the official kernel update containing this fix once available. No additional mitigations are indicated.

Description

A vulnerability in the Linux kernel's net/sched cls_flower component involves improper validation of a mask pointer after advancing it with nla_next(). This can lead to out-of-bounds reads when processing nested tunnel-option attributes, potentially causing kernel memory access violations. The issue arises because the mask pointer is advanced without proper validation, allowing reads beyond the intended attribute boundaries.

References

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