Race condition in Linux kernel - CVE-2026-45892

Vulnerability identifier: #VU132594

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-45892

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper synchronization in ext4 extent status tree handling in ext4_split_extent() when processing buffered writes to the middle of an unwritten extent without dioread_nolock enabled. A local user can trigger a stale unwritten extent entry to cause a denial of service.

The issue occurs when splitting an unwritten extent in the middle and converting it to initialized after a partial zeroout operation leaves extent status information inconsistent with the on-disk extent state.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 5.10.0-323.0.0.224
bpftool - update to 5.10.0-323.0.0.224
bpftool-debuginfo - update to 5.10.0-323.0.0.224
kernel-debuginfo - update to 5.10.0-323.0.0.224
kernel-debugsource - update to 5.10.0-323.0.0.224
kernel-devel - update to 5.10.0-323.0.0.224
kernel-headers - update to 5.10.0-323.0.0.224
kernel-source - update to 5.10.0-323.0.0.224
kernel-tools - update to 5.10.0-323.0.0.224
kernel-tools-debuginfo - update to 5.10.0-323.0.0.224
kernel-tools-devel - update to 5.10.0-323.0.0.224
perf - update to 5.10.0-323.0.0.224
perf-debuginfo - update to 5.10.0-323.0.0.224
python3-perf - update to 5.10.0-323.0.0.224
python3-perf-debuginfo - update to 5.10.0-323.0.0.224

• https://git.kernel.org/stable/c/6d882ea3b0931b43530d44149b79fcd4ffc13030
• https://git.kernel.org/stable/c/a1b962a821e7a52d48212ae269b45808b4411267
• https://git.kernel.org/stable/c/c2ee51d684adca7645e4aa74adca13f6750390bc
• https://git.kernel.org/stable/c/d8ee559fccdef713f058cfe5f2c03dc9b18be3b1
• https://git.kernel.org/stable/c/f0931a5c17005a0c4fc35bd1a001245effc3354b

• Race condition in Linux kernel ext4
• openEuler 22.03 LTS SP4 update for kernel