CVE-2026-64531 (GCVE-0-2026-64531)
Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-08-22 04:12
VLAI
EPSS
VEX
Title
net: openvswitch: reject oversized nested action attrs
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: openvswitch: reject oversized nested action attrs
Open vSwitch stores generated flow actions as nlattrs, whose nla_len
field is u16. Commit a1e64addf3ff ("net: openvswitch: remove
misbehaving actions length check") allowed the total sw_flow_actions
stream to grow beyond 64 KiB, which is valid, but also removed the last
guard preventing a generated nested action attribute from exceeding
U16_MAX.
An oversized generated container can thus be closed with a truncated
nla_len. A later dump or teardown then walks a structurally different
stream than the one that was validated. In particular, an oversized
nested CLONE/CT action may cause subsequent bytes in the generated
stream to be interpreted as independent actions.
Keep the larger total-action-stream behavior, but make nested action
close reject generated containers that do not fit in nla_len, and return
the error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and
CHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse
construction order before discarding failed wrappers, so resources copied
into the rejected tails are released before the wrappers are removed.
Most failed outer wrappers are discarded by truncating actions_len after
child resources have been released. CHECK_PKT_LEN also trims its parent
after branch resources are gone. SET/TUNNEL close failures unwind their
known tun_dst ownership directly, and SET_TO_MASKED has no external
ownership and truncates on close failure.
Severity
7.8 (High)
Assigner
References
12 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
057dbc5b72e9fcac439cd561c3a539b8a0edeb92 , < ab855641241387db062a5e41d9ad6b8561542572
(git)
Affected: 2532adbfe917c0e71dba2650ffc6efe396314c87 , < c66bd2626c2764f23764ff0f8277f44a9cfe8349 (git) Affected: 4b1a0ee6164c7204c68ab5a9c48c07bfe8852485 , < d573250d228401f707f4dbc09d11227a6215ee5f (git) Affected: e6610f9c08b4c04cf7949c10fc246c071d00e935 , < f1efff8858403191361a01269c6fe8dd7f55a385 (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < dbd14f736be02cfe73049bd801af89becd1a0749 (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < 1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe (git) Affected: a1e64addf3ff9257b45b78bc7d743781c3f41340 , < 3f1f755366687d051174739fb99f7d560202f60b (git) Affected: 6b099d285d7ed324494b6d684f377aa103856118 (git) Affected: 5.15.180 , < 5.15.212 (semver) Affected: 6.1.132 , < 6.1.178 (semver) Affected: 6.6.84 , < 6.6.145 (semver) Affected: 6.12.20 , < 6.12.97 (semver) Affected: 6.13.8 , < 6.14 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.14
Unaffected: 0 , < 6.14 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f1efff8858403191361a01269c6fe8dd7f55a385"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/07/28/8"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/07/31/17"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/08/01/1"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/08/01/3"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/08/22/1"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-01T12:34:16+00:00",
"cve": "CVE-2026-64531",
"id": "CVE-2026-64531",
"initial_release_date": "2026-07-27T00:00:00+00:00",
"product_status:fixed": "1145",
"product_status:known_affected": "23",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: openvswitch: reject oversized nested action attrs",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64531.json",
"version": "3"
}
}
}
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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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