Race condition in Linux kernel - CVE-2026-64093
Published: July 20, 2026
Vulnerability identifier: #VU138540
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-2026-64093
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 batman-adv tp_meter timer handling in batadv_tp_sender_cleanup() when shutting down the sender timer during cleanup. A local user can trigger timer re-arming after cleanup to cause a denial of service.
The issue occurs because the timer may be re-armed after its reference has already been released.
How to mitigate CVE-2026-64093
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c
- https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e
- https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a
- https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43
- https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991
- https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a
- https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff