CVE-2026-80638: Linux kernel · ocfs2: fix out-of-bounds write in ocfs2_remove_refcount_extent
Affects Linux kernelSource GCVE Database
Not known to be exploited · CVSS 8.8 High · fixed in 7.0.0-1014.14~24.04.1 : patch Linux kernel soon.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 28 Aug 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
Upgrade to a fixed release listed under Affected software.
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 patch is available that fixes the out-of-bounds write by correcting the memset operation in ocfs2_remove_refcount_extent(). Users should apply the official Linux kernel updates for the affected versions to remediate this vulnerability.
Description
A vulnerability in the Linux kernel's ocfs2 filesystem subsystem caused an out-of-bounds write when unlinking a refcounted file with leaf blocks in its refcount tree. This was due to an incorrect bulk memset operation on a union member, leading to memory corruption detected by fortify checks. The issue has been fixed by bounding the memset correctly after adjusting the refcount tree structure.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80638 (opens in a new tab)
- git.kernel.org/stable/c/1ec3cca2d8b6b9ff6584ca626d4c8918bbf48d44 (opens in a new tab)
- git.kernel.org/stable/c/f5255516ec7add3a6d5d37853ad5a9a9ddb14305 (opens in a new tab)
- ubuntu.com/security/CVE-2026-80638 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80638 (opens in a new tab)
- git.kernel.org/linus/1ec3cca2d8b6b9ff6584ca626d4c8918bbf48d44 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)