CVE-2026-63834: linux

CVSS: UnknownAwaiting analysis
AliasesUBUNTU-CVE-2026-63834DEBIAN-CVE-2026-63834
Published 19-07-2026Last modified 17-08-2026
Open JSON

Vulnerability summary

CVE-2026-63834 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 19
MGASA-2026-0312OPENSUSE-SU-2026:11339-1USN-8726-1USN-8726-2USN-8726-3USN-8726-4

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

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().

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.177-1 | < 6.12.95-1 | < 7.1.3-1
Linux1 product
  • linux≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 31a88792bfba142be3c9521538c1db805677381f | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1111a3381bca2d1f084a07686bc783af5ab23df7 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1c616b0be4bd8399d485e25e91859373b95d6013 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < f8c499fd275e59203b77fca76ae6ef2d096c2133 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < c6231d628d06d841bc1617b2f7034f5f39876b16 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 2233787658db859f0a9b83cb397cf783bb8be865 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < 1fb8762600a393d1caccd63be5d07e1756982d68 | ≥ 33a3bb4a3345bb511f9c69c913da95d4693e2a4e, < e7c775110e1858e5a7471a23a9c9658c0af9df89 | 4.8

3 vendors · 170 products

References

31 links
Show all 31 references