5.5

CVE-2026-43451: linux

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43451DEBIAN-CVE-2026-43451
Published 08-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-43451 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 40 · Related 40
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23221-1

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue entry from the queue data structures, taking ownership of the entry. For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN attributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN present but NFQA_VLAN_TCI missing), the function returns immediately without freeing the dequeued entry or its sk_buff. This leaks the nf_queue_entry, its associated sk_buff, and all held references (net_device refcounts, struct net refcount). Repeated triggering exhausts kernel memory. Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict on the error path, consistent with other error handling in this file.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

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

Affected systems

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < a907bea273b60d3e604ec4e8e1f6c49954805794 | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < 0b18d1b834ab5a5009be70b530f978d7989e445b | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < b38d2b4603fd3dda24eb8b3dd81c18a0930be97b | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < 47b1c5d1b0944aa88299f55a846fabaefc756982 | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < cf4a4df38d1747e06fc54f9879bd7a6f4178032f | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < 9853d94b82d303fc4ac37d592a23a154096ecd41 | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < 208669df703a25a601f45822b10c413f258bf275 | ≥ 8d45ff22f1b43249f0cf1baafe0262ca10d1666e, < f1ba83755d81c6fc66ac7acd723d238f974091e9 | 4.7
  • linux_kernel≥ 4.7, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.19 | ≥ 6.19, < 6.19.9 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 159 products

References

39 links
Show all 39 references