VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90265: Linux kernel · btrfs: defrag: fix deadlock between defrag and delalloc space reservation

Source GCVE Database

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Authoritative record:CVE-2026-90265· Medium

Not known to be exploited · fixed in c97277aa6ce8ac725642aced0fe20cd8d31f6e09 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:33 UTC

Severity

Medium

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

Thin evidence

One scorer or none

Patch: Available – fixed in c97277aa6ce8ac725642aced0fe20cd8d31f6e09, ba02eab28041f9a4bbe9fc90c7249644fef6de0f, ac916391e1c70801649f7d6f85014f687983bc33 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 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 30 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.
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.

ghsa-hrjh-vpgf-4c95

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < c97277aa6ce8ac725642aced0fe20cd8d31f6e09	Fixed in c97277aa6ce8ac725642aced0fe20cd8d31f6e09
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < ba02eab28041f9a4bbe9fc90c7249644fef6de0f	Fixed in ba02eab28041f9a4bbe9fc90c7249644fef6de0f
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < ac916391e1c70801649f7d6f85014f687983bc33	Fixed in ac916391e1c70801649f7d6f85014f687983bc33
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < a9701dd06e82c345fe70debdf8835b7eb5000c59	Fixed in a9701dd06e82c345fe70debdf8835b7eb5000c59
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < 37614074596827a5f292243673b699c90ff63e7d	Fixed in 37614074596827a5f292243673b699c90ff63e7d
LinuxLinux	Affected ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < 046396bd16fdf0a9fbdf5f04c6eda26024e7695e	Fixed in 046396bd16fdf0a9fbdf5f04c6eda26024e7695e

AI-suggested

A fix for this deadlock issue has been implemented in the Linux kernel. Users should update to a kernel version that includes this fix to prevent the deadlock condition. No additional mitigation steps are indicated beyond applying the official kernel update.

Description

A deadlock vulnerability in the Linux kernel's Btrfs filesystem defragmentation process has been fixed. The issue occurs when defrag operations reserve delayed allocation (delalloc) space while holding dirty and locked folios and the extent range lock, causing a deadlock during concurrent filesystem stress tests with autodefrag and flushoncommit enabled.

References

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