VulnerabilityPublished 28 Oct 2026

CVE-2026-99175: Linux kernel · fsnotify: prevent mark additions during connector teardown

Source GCVE Database

Authoritative record:CVE-2026-99175

Not known to be exploited · fixed in 952501bfc6e5e654ac4a17ec9d90c1ec614bd9f1 : patch Linux kernel soon.

Data as of 28 Oct 2026, 13:46 UTC

Severity

High

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

Patch: Available – fixed in 952501bfc6e5e654ac4a17ec9d90c1ec614bd9f1, 472589eacdf10b5f9bd10b333957ed5291b2544b, 36ebddca56b9d8993d6dc984fdecc748ee1f5e06

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-qvp9-6wr3-29m5

What to do

Upgrade Linux kernel to 952501bfc6e5e654ac4a17ec9d90c1ec614bd9f1, 472589eacdf10b5f9bd10b333957ed5291b2544b or 36ebddca56b9d8993d6dc984fdecc748ee1f5e06.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6b3f05d24d355f50f3d9814304650fcab0efb482, < 952501bfc6e5e654ac4a17ec9d90c1ec614bd9f1	Fixed in 952501bfc6e5e654ac4a17ec9d90c1ec614bd9f1
LinuxLinux	Affected ≥ 6b3f05d24d355f50f3d9814304650fcab0efb482, < 472589eacdf10b5f9bd10b333957ed5291b2544b	Fixed in 472589eacdf10b5f9bd10b333957ed5291b2544b
LinuxLinux	Affected ≥ 6b3f05d24d355f50f3d9814304650fcab0efb482, < 36ebddca56b9d8993d6dc984fdecc748ee1f5e06	Fixed in 36ebddca56b9d8993d6dc984fdecc748ee1f5e06
LinuxLinux	Affected =4.12	Fixed in–
Debiandebian/linux`pkg:deb/debian/linux`Other threats	Affected =4.12	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to prevent mark additions during connector teardown by setting a DESTROYING flag and rejecting new marks with an error. Users should apply the official kernel updates that include this fix. Since this is a kernel-level vulnerability, updating to the patched kernel version is the recommended mitigation.

Description

A vulnerability in the Linux kernel's fsnotify subsystem could lead to a null pointer dereference during connector teardown. This occurs due to a race condition where new marks can be added while the connector is being destroyed, potentially causing a kernel crash (KASAN null pointer dereference). The issue has been resolved by preventing mark additions during connector teardown.

References

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