{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64531", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.794Z", "datePublished": "2026-07-27T06:32:32.596Z", "dateUpdated": "2026-07-27T06:32:32.596Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-27T06:32:32.596Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: reject oversized nested action attrs\n\nOpen vSwitch stores generated flow actions as nlattrs, whose nla_len\nfield is u16. Commit a1e64addf3ff (\"net: openvswitch: remove\nmisbehaving actions length check\") allowed the total sw_flow_actions\nstream to grow beyond 64 KiB, which is valid, but also removed the last\nguard preventing a generated nested action attribute from exceeding\nU16_MAX.\n\nAn oversized generated container can thus be closed with a truncated\nnla_len. A later dump or teardown then walks a structurally different\nstream than the one that was validated. In particular, an oversized\nnested CLONE/CT action may cause subsequent bytes in the generated\nstream to be interpreted as independent actions.\n\nKeep the larger total-action-stream behavior, but make nested action\nclose reject generated containers that do not fit in nla_len, and return\nthe error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and\nCHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse\nconstruction order before discarding failed wrappers, so resources copied\ninto the rejected tails are released before the wrappers are removed.\n\nMost failed outer wrappers are discarded by truncating actions_len after\nchild resources have been released. CHECK_PKT_LEN also trims its parent\nafter branch resources are gone. SET/TUNNEL close failures unwind their\nknown tun_dst ownership directly, and SET_TO_MASKED has no external\nownership and truncates on close failure."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/openvswitch/flow_netlink.c"], "versions": [{"version": "057dbc5b72e9fcac439cd561c3a539b8a0edeb92", "lessThan": "ab855641241387db062a5e41d9ad6b8561542572", "status": "affected", "versionType": "git"}, {"version": "2532adbfe917c0e71dba2650ffc6efe396314c87", "lessThan": "c66bd2626c2764f23764ff0f8277f44a9cfe8349", "status": "affected", "versionType": "git"}, {"version": "4b1a0ee6164c7204c68ab5a9c48c07bfe8852485", "lessThan": "d573250d228401f707f4dbc09d11227a6215ee5f", "status": "affected", "versionType": "git"}, {"version": "e6610f9c08b4c04cf7949c10fc246c071d00e935", "lessThan": "f1efff8858403191361a01269c6fe8dd7f55a385", "status": "affected", "versionType": "git"}, {"version": "a1e64addf3ff9257b45b78bc7d743781c3f41340", "lessThan": "dbd14f736be02cfe73049bd801af89becd1a0749", "status": "affected", "versionType": "git"}, {"version": "a1e64addf3ff9257b45b78bc7d743781c3f41340", "lessThan": "1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe", "status": "affected", "versionType": "git"}, {"version": "a1e64addf3ff9257b45b78bc7d743781c3f41340", "lessThan": "3f1f755366687d051174739fb99f7d560202f60b", "status": "affected", "versionType": "git"}, {"version": "6b099d285d7ed324494b6d684f377aa103856118", "status": "affected", "versionType": "git"}, {"version": "5.15.180", "lessThan": "5.15.212", "status": "affected", "versionType": "semver"}, {"version": "6.1.132", "lessThan": "6.1.178", "status": "affected", "versionType": "semver"}, {"version": "6.6.84", "lessThan": "6.6.145", "status": "affected", "versionType": "semver"}, {"version": "6.12.20", "lessThan": "6.12.97", "status": "affected", "versionType": "semver"}, {"version": "6.13.8", "lessThan": "6.14", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/openvswitch/flow_netlink.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.180", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.132", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.84", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.20", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "7.2-rc4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ab855641241387db062a5e41d9ad6b8561542572"}, {"url": "https://git.kernel.org/stable/c/c66bd2626c2764f23764ff0f8277f44a9cfe8349"}, {"url": "https://git.kernel.org/stable/c/d573250d228401f707f4dbc09d11227a6215ee5f"}, {"url": "https://git.kernel.org/stable/c/f1efff8858403191361a01269c6fe8dd7f55a385"}, {"url": "https://git.kernel.org/stable/c/dbd14f736be02cfe73049bd801af89becd1a0749"}, {"url": "https://git.kernel.org/stable/c/1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe"}, {"url": "https://git.kernel.org/stable/c/3f1f755366687d051174739fb99f7d560202f60b"}], "title": "net: openvswitch: reject oversized nested action attrs", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[057dbc5b72e9fcac439cd561c3a539b8a0edeb92,ab855641241387db062a5e41d9ad6b8561542572)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2532adbfe917c0e71dba2650ffc6efe396314c87,c66bd2626c2764f23764ff0f8277f44a9cfe8349)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[4b1a0ee6164c7204c68ab5a9c48c07bfe8852485,d573250d228401f707f4dbc09d11227a6215ee5f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e6610f9c08b4c04cf7949c10fc246c071d00e935,f1efff8858403191361a01269c6fe8dd7f55a385)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e64addf3ff9257b45b78bc7d743781c3f41340,dbd14f736be02cfe73049bd801af89becd1a0749)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e64addf3ff9257b45b78bc7d743781c3f41340,1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e64addf3ff9257b45b78bc7d743781c3f41340,3f1f755366687d051174739fb99f7d560202f60b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "6b099d285d7ed324494b6d684f377aa103856118"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.180,5.15.212)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.132,6.1.178)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.84,6.6.145)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.20,6.12.97)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.13.8,6.14)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-27T09:00:12.285338+00:00", "updated": "2026-07-27T09:00:12.285411+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}