VulnerabilityPublished 28 Oct 2026

CVE-2026-99158: Linux kernel · ring-buffer: Fix false warning in ring_buffer_map_get_reader()

Source GCVE Database

Authoritative record:CVE-2026-99158

Not known to be exploited · fixed in 029770f5badedc0f0ff85fc45e24785cbbee4a67 : update Linux kernel when convenient.

Data as of 28 Oct 2026, 13:58 UTC

Severity

Low

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

Patch: Available – fixed in 029770f5badedc0f0ff85fc45e24785cbbee4a67, 89bab1dba8a0167ef0d819e0f55b6bafa038e87f, 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438

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-vq2v-33jv-5cr9

What to do

Upgrade Linux kernel to 029770f5badedc0f0ff85fc45e24785cbbee4a67, 89bab1dba8a0167ef0d819e0f55b6bafa038e87f or 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 029770f5badedc0f0ff85fc45e24785cbbee4a67	Fixed in 029770f5badedc0f0ff85fc45e24785cbbee4a67
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 89bab1dba8a0167ef0d819e0f55b6bafa038e87f	Fixed in 89bab1dba8a0167ef0d819e0f55b6bafa038e87f
LinuxLinux	Affected ≥ 117c39200d9d760cbd5944bb89efb7b9c51965aa, < 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438	Fixed in 68e6ab180cfb6dfa79652f41ed7899a6d4cf5438
LinuxLinux	Affected =6.10	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this issue. Users should apply the official kernel update that includes this correction. Since this is not a cloud service, manual patching is required. Patch status is not explicitly confirmed in the input; users should consult the vendor advisory or kernel update notes for the fixed version.

Description

A vulnerability in the Linux kernel's ring-buffer subsystem caused false warnings in the ring_buffer_map_get_reader() function when the mmap reader caught up with a writer still committing events. This was due to improper handling of a NULL return value from rb_get_reader_page(), which was mistakenly treated as an error. The issue has been fixed by correctly handling the NULL case without warning and removing redundant checks.

References

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