Race condition in Linux kernel - CVE-2026-43484
Published: May 14, 2026
Vulnerability identifier: #VU131432
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43484
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the mmc core claim and retune flag handling when processing concurrent asynchronous operations. A local user can trigger concurrent flag updates to cause a denial of service.
The issue can trigger a spurious WARN_ON(!host->claimed) due to shared-word coupling between the claimed and retune control flags.
How to mitigate CVE-2026-43484
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d
- https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e
- https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c
- https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9
- https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824
- https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5
- https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc