Race condition in Linux kernel - CVE-2026-93204
Published: September 18, 2026
Vulnerability identifier: #VU150798
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93204
CWE-ID: CWE-362
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to poison an ARP cache.
The vulnerability exists due to a race condition caused by non-atomic MAC address updates in batadv_dat_entry_add() in the batman-adv distributed ARP table when a MAC address is updated concurrently with a reader accessing the entry. A remote attacker can cause a MAC address update to race with a reader to poison an ARP cache.
Affected software
Linux kernel
How to mitigate CVE-2026-93204
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040
- https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274
- https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7
- https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd
- https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515
- https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73
- https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9