CVE-2026-90418: Linux kernel · nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 17 Sep 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| 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 is available that addresses the issue by returning an error when the filesystem is read-only and limiting kernel warnings. Users should apply the official kernel updates that include this fix to prevent kernel BUGs related to nilfs2 dirty page state mismatches.
Description
A vulnerability in the Linux kernel's nilfs2 filesystem component was resolved that addressed a kernel BUG triggered by a mismatch in the dirty state of file pages. The issue occurred when a dirty page unexpectedly lost its 'dirty' status due to asynchronous clearing of the dirty flag after the filesystem detected metadata corruption and switched to read-only mode. The fix involves returning an error when the filesystem is read-only and limiting kernel warnings to a single occurrence when the unexpected state is detected outside read-only mode.
References
- ubuntu.com/security/CVE-2026-90418 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-90418 (opens in a new tab)
- git.kernel.org/linus/66f4ad3ce158902e5f98afea93189972ed8750c2 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90418.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)