Race condition in Linux kernel - CVE-2026-92501
Published: September 18, 2026
Vulnerability identifier: #VU151018
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-2026-92501
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in ext4_buffered_write_iter() when a direct I/O write falls back to buffered I/O while concurrent direct I/O completes. A local user can issue concurrent direct I/O operations to cause a denial of service.
The issue can also occur when non-overlapping direct I/O writes share a large folio and the block size is smaller than the folio size.
Affected software
Linux kernel
How to mitigate CVE-2026-92501
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/15cdefd0c0522f9d5e12d947fa04f4c11649b699
- https://git.kernel.org/stable/c/4e4e3eec506247c8f8bd8aaa1eb25e67016681a5
- https://git.kernel.org/stable/c/7341e234927ff215f1d5d0bcfe04b74f53af378d
- https://git.kernel.org/stable/c/74eee4ff9698a65b2e6e15dac0e50d6526ad5f20
- https://git.kernel.org/stable/c/9fd3ffc3c51c9deaba99bd7b338fff2d08f52416
- https://git.kernel.org/stable/c/d47cdadd6e49023f7ee248048463807f1214f1ee
- https://git.kernel.org/stable/c/f0af3ae09fb72382da1a5371bf6761b0264668e4
- https://git.kernel.org/stable/c/fd7e0dab20837b9ea1eeef7c26f78ace8ac8258c