VulnerabilityPublished 28 Oct 2026

CVE-2026-99142: Linux kernel · tracing: Check operator stack capacity before pushing

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c47a7b11bcb3d45e29723afcf6336866476b1d08 : update Linux kernel when convenient.

Data as of 28 Oct 2026, 10:58 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Patch: Available – fixed in c47a7b11bcb3d45e29723afcf6336866476b1d08, a866a8a753922cdf7710b8eb3f686dc0efc06505, 75e894f92417390f0ef44fd350f2d3634c784876

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.

What to do

Upgrade Linux kernel to c47a7b11bcb3d45e29723afcf6336866476b1d08, a866a8a753922cdf7710b8eb3f686dc0efc06505 or 75e894f92417390f0ef44fd350f2d3634c784876.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 39f7c41c908bc82947ce47cdd021520ff486c53f, < c47a7b11bcb3d45e29723afcf6336866476b1d08	Fixed in c47a7b11bcb3d45e29723afcf6336866476b1d08
LinuxLinux	Affected ≥ 39f7c41c908bc82947ce47cdd021520ff486c53f, < a866a8a753922cdf7710b8eb3f686dc0efc06505	Fixed in a866a8a753922cdf7710b8eb3f686dc0efc06505
LinuxLinux	Affected ≥ 39f7c41c908bc82947ce47cdd021520ff486c53f, < 75e894f92417390f0ef44fd350f2d3634c784876	Fixed in 75e894f92417390f0ef44fd350f2d3634c784876
LinuxLinux	Affected =6.6	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Check operator stack capacity before pushing predicate_parse() uses the first operator stack entry before processing any opening parentheses. A push then increments top before writing. The existing check still permits that write when top already points to the last allocated entry, which can access beyond the operator stack. Reject the push when top reaches the last allocated entry.

References

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