Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: restrict number of unacked list entries When the unacked_list is unbound, an attacker could send messages with small lengths and appropriated seqno + gaps to force the receiver to allocate more and more unacked_list entries. And the end either causing an out-of-memory situation or increase the management overhead for the (large) list that significant portions of CPU cycles are wasted in searching through the list. When limiting the list to a specific number, it is important to still correctly add a new entry to the list. But if the list became larger than the limit, the last entry of the list (with the highest seqno) must be dropped to still allow the earlier seqnos to finish and therefore to continue the process. Otherwise, the process might get stuck with too high seqnos which are not handled by batadv_tp_ack_unordered().
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
FAQ
What is CVE-2026-63834?
CVE-2026-63834 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: restrict number of unacked list entries When the unacked_list is unbound, an attacker could send messages wi...
How severe is CVE-2026-63834?
CVSS scoring is not yet available for CVE-2026-63834. Check NVD for updates.
Is there a patch for CVE-2026-63834?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.