VulnerabilityPublished 17 Sep 2026Updated 30 Oct 2026

CVE-2026-90418: Linux kernel · nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch

Source GCVE Database

Compare

Authoritative record:CVE-2026-90418· Medium

Not known to be exploited · fixed in f181155baf0c93a74ebe804c6cecbe970e78ee9e : update Linux kernel when convenient.

Data as of 30 Oct 2026, 18:21 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 f181155baf0c93a74ebe804c6cecbe970e78ee9e, 6879c603a8d07af82da83768cc2342a11bd444e5, 5166a21b12f549774f2983fa86d2526ea9e66ace +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-c854-fhx8-wg6w

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < f181155baf0c93a74ebe804c6cecbe970e78ee9e	Fixed in f181155baf0c93a74ebe804c6cecbe970e78ee9e
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < 6879c603a8d07af82da83768cc2342a11bd444e5	Fixed in 6879c603a8d07af82da83768cc2342a11bd444e5
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < 5166a21b12f549774f2983fa86d2526ea9e66ace	Fixed in 5166a21b12f549774f2983fa86d2526ea9e66ace
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < 3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05	Fixed in 3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < 66f4ad3ce158902e5f98afea93189972ed8750c2	Fixed in 66f4ad3ce158902e5f98afea93189972ed8750c2
LinuxLinux	Affected ≥ 8c26c4e2694a163d525976e804d81cd955bbb40c, < 4e1f21e7540b25d83f86b50780836ed7d2afcc93	Fixed in 4e1f21e7540b25d83f86b50780836ed7d2afcc93

AI-suggested

A fix is available that modifies nilfs_copy_dirty_pages() to return an error when the filesystem is read-only and limits kernel warnings to one occurrence when writable. Users should apply the official Linux kernel updates that include this fix to prevent kernel BUGs related to this issue.

Description

A bug in the Linux kernel's nilfs2 filesystem component was fixed to prevent a kernel BUG triggered by a dirty state mismatch in nilfs_copy_dirty_pages(). The issue occurs when a dirty page unexpectedly loses its dirty status due to asynchronous clearing after metadata corruption detection and filesystem transition to read-only mode. The fix returns an error if the filesystem is read-only and limits kernel warnings to one occurrence when the filesystem is writable.

Impact

The vulnerability causes a kernel BUG that can lead to system instability or crashes when the nilfs2 filesystem encounters metadata corruption and transitions to read-only mode. This can disrupt normal filesystem operations and potentially affect system reliability. However, no exploitation in the wild is known, and the issue is triggered by internal filesystem state inconsistencies rather than external attack vectors.

References

Community reviews

Loading reviews…