CVE-2026-43451 (GCVE-0-2026-43451)
Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:24
VLAI
EPSS
VEX
Title
netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
Summary
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.
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < a907bea273b60d3e604ec4e8e1f6c49954805794
(git)
Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < 0b18d1b834ab5a5009be70b530f978d7989e445b (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < b38d2b4603fd3dda24eb8b3dd81c18a0930be97b (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < 47b1c5d1b0944aa88299f55a846fabaefc756982 (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < cf4a4df38d1747e06fc54f9879bd7a6f4178032f (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < 9853d94b82d303fc4ac37d592a23a154096ecd41 (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < 208669df703a25a601f45822b10c413f258bf275 (git) Affected: 8d45ff22f1b43249f0cf1baafe0262ca10d1666e , < f1ba83755d81c6fc66ac7acd723d238f974091e9 (git) |
guessed | |
| Linux | Linux |
Affected:
4.7
Unaffected: 0 , < 4.7 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
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"aggregate_severity": "Low",
"current_release_date": "2026-07-03T14:58:17+00:00",
"cve": "CVE-2026-43451",
"id": "CVE-2026-43451",
"initial_release_date": "2026-05-08T00:00:00+00:00",
"product_status:known_affected": "246",
"product_status:known_not_affected": "28",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43451.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:17:27Z",
"cve": "CVE-2026-43451",
"id": "CVE-2026-43451",
"initial_release_date": "2026-05-13T03:33:47Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "672",
"product_status:known_not_affected": "6",
"product_status:recommended": "273",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-43451",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43451.json",
"version": "11"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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