Incorrect calculation in Linux kernel - CVE-2026-100073
Published: September 28, 2026
Vulnerability identifier: #VU152278
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100073
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a transaction overflow.
The vulnerability exists due to incorrect transaction credit calculation in the ext4 writeback extent-conversion logic when performing ext4 writeback that requires extent conversion. A local user can trigger ext4 writeback requiring extent conversion to cause a transaction overflow.
This may occur when sparse folio dirtying requires a large unwritten extent to be split into multiple written extents and new extent-tree nodes to be allocated.
Affected software
Linux kernel
How to mitigate CVE-2026-100073
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3