CVE-2026-72159: Linux kernel · ocfs2: reject non-inline dinodes with i_size and zero i_clusters
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1117.124~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1117.124~20.04.1, 5.15.0-1123.132~20.04.1, 5.15.0-1122.131~20.04.1 +41
Exploitation evidence
Disclosed: evidence found.
CVE published 15 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 and should be applied to affected Linux kernel versions to enforce the invariant rejecting malformed non-inline dinodes with inconsistent i_size and cluster allocation states. The vendor advisory confirms that this issue has been fixed. Systems running affected kernel versions should update to the patched releases to mitigate this vulnerability.
Description
A vulnerability in the Linux kernel's OCFS2 filesystem was resolved that involved malformed non-inline dinodes with inconsistent i_size and cluster allocation states. Specifically, on volumes mounted without the sparse allocation feature, non-inline regular files or directories with a non-zero i_size but zero allocated clusters are structurally malformed, potentially causing errors during inode reads and file checks. This flaw was addressed by enforcing a shared predicate to reject such malformed dinodes, preventing improper processing. The issue affects certain Linux kernel versions and has been patched.
References
- nvd.nist.gov/vuln/detail/CVE-2026-72159 (opens in a new tab)
- git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3 (opens in a new tab)
- git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233 (opens in a new tab)
- git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260 (opens in a new tab)
- git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265 (opens in a new tab)
- git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 (opens in a new tab)
- git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c (opens in a new tab)
- git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e (opens in a new tab)
- git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4 (opens in a new tab)
- ubuntu.com/security/CVE-2026-72159 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-72159 (opens in a new tab)
- git.kernel.org/linus/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 (opens in a new tab)
- ubuntu.com/security/notices/USN-8876-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8878-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8879-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8877-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8875-1 (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)