Resource exhaustion in Linux kernel - CVE-2026-63834
Published: July 21, 2026
Vulnerability identifier: #VU138825
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63834
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the batman-adv tp_meter unacked_list handling when processing crafted messages with small lengths and seqno gaps. A remote attacker can send specially crafted messages to cause a denial of service.
The issue can lead to an out-of-memory condition or excessive CPU usage from management overhead while searching the enlarged list.
Affected software
Linux kernel
How to mitigate CVE-2026-63834
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/1111a3381bca2d1f084a07686bc783af5ab23df7
- https://git.kernel.org/stable/c/1c616b0be4bd8399d485e25e91859373b95d6013
- https://git.kernel.org/stable/c/1fb8762600a393d1caccd63be5d07e1756982d68
- https://git.kernel.org/stable/c/2233787658db859f0a9b83cb397cf783bb8be865
- https://git.kernel.org/stable/c/31a88792bfba142be3c9521538c1db805677381f
- https://git.kernel.org/stable/c/c6231d628d06d841bc1617b2f7034f5f39876b16
- https://git.kernel.org/stable/c/e7c775110e1858e5a7471a23a9c9658c0af9df89
- https://git.kernel.org/stable/c/f8c499fd275e59203b77fca76ae6ef2d096c2133