CVE-2026-43451netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < a907bea273b60d3e604ec4e8e1f6c49954805794
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < 0b18d1b834ab5a5009be70b530f978d7989e445b
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < b38d2b4603fd3dda24eb8b3dd81c18a0930be97b
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < 47b1c5d1b0944aa88299f55a846fabaefc756982
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < cf4a4df38d1747e06fc54f9879bd7a6f4178032f
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < 9853d94b82d303fc4ac37d592a23a154096ecd41
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < 208669df703a25a601f45822b10c413f258bf275
- affected 8d45ff22f1b43249f0cf1baafe0262ca10d1666e – < f1ba83755d81c6fc66ac7acd723d238f974091e9
- affected 4.7
- unaffected < 4.7
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.167 – ≤ 6.1.*
- unaffected 6.6.130 – ≤ 6.6.*
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.19 – ≤ 6.18.*
- unaffected 6.19.9 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794 (opens in a new tab)
- https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b (opens in a new tab)
- https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b (opens in a new tab)
- https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982 (opens in a new tab)
- https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f (opens in a new tab)
- https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41 (opens in a new tab)
- https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275 (opens in a new tab)
- https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28757 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-43451)Record last updated .