Azure linux: A vulnerability in the Linux kernel ext4 filesystem code could leave stale extent entries in the extent status tree if splitting an extent fails. (CVE-2026-45899)
A vulnerability in the Linux kernel ext4 filesystem code could leave stale extent entries in the extent status tree if splitting an extent fails. This occurs because the code might return an error without properly dropping all partially processed extents. The issue has been resolved by ensuring all potentially stale extents are dropped when splitting fails. The vulnerability affects version 3.0 of the Linux kernel ext4 code. It has a medium severity rating and no known exploits in the wild.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel ext4 filesystem involves improper handling of extent splitting failures. When the split extent operation fails, some extents may remain partially processed and stale entries can persist in the extent status tree. This can lead to inconsistent filesystem state or potential denial of service due to corrupted extent metadata. The fix involves dropping all remaining potentially stale extents if the splitting operation fails, preventing stale entries from lingering.
Potential Impact
The vulnerability does not impact confidentiality or integrity but affects availability by potentially causing denial of service through filesystem corruption or instability. There are no known exploits in the wild. The impact is limited to local attackers with low privileges due to the local attack vector and required privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or workaround information is provided in the available data. Users should monitor the Microsoft Security Response Center advisory for updates and apply any official fixes once available.
Azure linux: A vulnerability in the Linux kernel ext4 filesystem code could leave stale extent entries in the extent status tree if splitting an extent fails. (CVE-2026-45899)
Description
A vulnerability in the Linux kernel ext4 filesystem code could leave stale extent entries in the extent status tree if splitting an extent fails. This occurs because the code might return an error without properly dropping all partially processed extents. The issue has been resolved by ensuring all potentially stale extents are dropped when splitting fails. The vulnerability affects version 3.0 of the Linux kernel ext4 code. It has a medium severity rating and no known exploits in the wild.
CVSS v3.1
Score 5.5medium
Affected software
pkg:github/microsoft/azure-linuxRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel ext4 filesystem involves improper handling of extent splitting failures. When the split extent operation fails, some extents may remain partially processed and stale entries can persist in the extent status tree. This can lead to inconsistent filesystem state or potential denial of service due to corrupted extent metadata. The fix involves dropping all remaining potentially stale extents if the splitting operation fails, preventing stale entries from lingering.
Potential Impact
The vulnerability does not impact confidentiality or integrity but affects availability by potentially causing denial of service through filesystem corruption or instability. There are no known exploits in the wild. The impact is limited to local attackers with low privileges due to the local attack vector and required privileges.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or workaround information is provided in the available data. Users should monitor the Microsoft Security Response Center advisory for updates and apply any official fixes once available.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-45899
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a18ab95e29bf47b50289759
Added to database: 05/28/2026, 20:54:45 UTC
Last enriched: 06/26/2026, 23:38:31 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 62
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