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CVE-2026-63834

UnknownEPSS 0.17%

Last modified

CVE-2026-63834 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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().

Metrics

EPSS Probability
0.17%

7.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 31a88792bfba142be3c9521538c1db805677381f; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1111a3381bca2d1f084a07686bc783af5ab23df7; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1c616b0be4bd8399d485e25e91859373b95d6013; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < f8c499fd275e59203b77fca76ae6ef2d096c2133; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < c6231d628d06d841bc1617b2f7034f5f39876b16; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 2233787658db859f0a9b83cb397cf783bb8be865; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1fb8762600a393d1caccd63be5d07e1756982d68; >= 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < e7c775110e1858e5a7471a23a9c9658c0af9df89
LinuxLinux4.8

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-63834?
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().
How severe is CVE-2026-63834?
Severity scoring for CVE-2026-63834 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63834?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST