CVE-2026-89496: Linux kernel · ocfs2: always run deallocs on copy-on-write completion
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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 for this vulnerability has been implemented in the Linux kernel. Users should update to a kernel version that includes this resolution. Since no vendor advisory or patch links are provided, verify with the official Linux kernel release notes or distribution security advisories for the exact fixed versions and apply updates accordingly.
Description
A memory leak vulnerability in the Linux kernel's ocfs2 filesystem was identified and resolved. The issue occurs during copy-on-write operations triggered by the copy_file_range() syscall within the same filesystem, leading to unreferenced memory objects. This flaw was detected through local fuzzing of kernel version 6.12.94. The vulnerability affects multiple specific Linux kernel versions. No evidence of active exploitation is reported.
References
- nvd.nist.gov/vuln/detail/CVE-2026-89496 (opens in a new tab)
- git.kernel.org/stable/c/09e93a60e18e83a630ff84ae00cb564bab96ab1f (opens in a new tab)
- git.kernel.org/stable/c/123c050eb96aae0bab74c9f06c6ad3de7992722b (opens in a new tab)
- git.kernel.org/stable/c/71f07b7f90b3109c9098d1b9c8efbbeece5deb8a (opens in a new tab)
- git.kernel.org/stable/c/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616 (opens in a new tab)
- msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89496.json (opens in a new tab)
- support.microsoft.com/lifecycle (opens in a new tab)
- first.org/cvss (opens in a new tab)
- ubuntu.com/security/CVE-2026-89496 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-89496 (opens in a new tab)
- git.kernel.org/linus/82ea9d4fc05fb7a387db547c6a7c0aa6a3719616 (opens in a new tab)