CVE-2026-97549: Linux kernel · xfs: fix under-reservation of blocks when repairing sf directories
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
- 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 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 has been implemented in the Linux kernel to correct the block reservation logic in XFS directory repair functions. Users should update to the patched versions of the Linux kernel where this issue is resolved. No additional mitigation actions are indicated beyond applying the official fix.
Description
A vulnerability in the Linux kernel's XFS filesystem was fixed that involved under-reservation of blocks when repairing shortform (sf) directories. This issue caused assertion failures and could lead to filesystem shutdowns due to incorrect block reservation calculations during directory repairs. The problem stemmed from incorrect assumptions about directory block sizes and reservation counts in certain repair functions. The fix involved correcting these calculations to properly reserve the required blocks.
References
- ubuntu.com/security/CVE-2026-97549 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97549 (opens in a new tab)
- git.kernel.org/stable/c/b950e84acd072ac648ace4fea53c0b1212da4b2c (opens in a new tab)
- git.kernel.org/stable/c/4d3c07591534517c633945c8d8e6526f10e3fabc (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-97549 (opens in a new tab)
- git.kernel.org/stable/c/996cce0c422b66a0e8b1a99505f896b0669ee5b6 (opens in a new tab)
- git.kernel.org/stable/c/b8f46ca5cbd629ffb91489ad7f970b3837835b0a (opens in a new tab)