{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43455", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.010Z", "datePublished": "2026-05-08T14:22:19.375Z", "dateUpdated": "2026-05-11T22:24:55.256Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:24:55.256Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp: route: hold key->lock in mctp_flow_prepare_output()\n\nmctp_flow_prepare_output() checks key->dev and may call\nmctp_dev_set_key(), but it does not hold key->lock while doing so.\n\nmctp_dev_set_key() and mctp_dev_release_key() are annotated with\n__must_hold(&key->lock), so key->dev access is intended to be\nserialized by key->lock. The mctp_sendmsg() transmit path reaches\nmctp_flow_prepare_output() via mctp_local_output() -> mctp_dst_output()\nwithout holding key->lock, so the check-and-set sequence is racy.\n\nExample interleaving:\n\n CPU0 CPU1\n ---- ----\n mctp_flow_prepare_output(key, devA)\n if (!key->dev) // sees NULL\n mctp_flow_prepare_output(\n key, devB)\n if (!key->dev) // still NULL\n mctp_dev_set_key(devB, key)\n mctp_dev_hold(devB)\n key->dev = devB\n mctp_dev_set_key(devA, key)\n mctp_dev_hold(devA)\n key->dev = devA // overwrites devB\n\nNow both devA and devB references were acquired, but only the final\nkey->dev value is tracked for release. One reference can be lost,\ncausing a resource leak as mctp_dev_release_key() would only decrease\nthe reference on one dev.\n\nFix by taking key->lock around the key->dev check and\nmctp_dev_set_key() call."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mctp/route.c"], "versions": [{"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "47893166bc5611ee9a20de6b8d2933b2320fb772", "status": "affected", "versionType": "git"}, {"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "86f5334fcb48a5b611c33364ab52ca684d0f6d91", "status": "affected", "versionType": "git"}, {"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "0695712f3a6f1a48915f95767cfb42077683dcdc", "status": "affected", "versionType": "git"}, {"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "925a5ffd99cddd7a7e41d5ad120c7a2c6d50260f", "status": "affected", "versionType": "git"}, {"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "8d27d9b260dd19c1b519e1a13de6448f9984e30e", "status": "affected", "versionType": "git"}, {"version": "67737c457281dd199ceb9e31b6ba7efd3bfe566d", "lessThan": "7d86aa41c073c4e7eb75fd2e674f1fd8f289728a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mctp/route.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "5.16", "versionEndExcluding": "6.1.167"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.130"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.19.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/47893166bc5611ee9a20de6b8d2933b2320fb772"}, {"url": "https://git.kernel.org/stable/c/86f5334fcb48a5b611c33364ab52ca684d0f6d91"}, {"url": "https://git.kernel.org/stable/c/0695712f3a6f1a48915f95767cfb42077683dcdc"}, {"url": "https://git.kernel.org/stable/c/925a5ffd99cddd7a7e41d5ad120c7a2c6d50260f"}, {"url": "https://git.kernel.org/stable/c/8d27d9b260dd19c1b519e1a13de6448f9984e30e"}, {"url": "https://git.kernel.org/stable/c/7d86aa41c073c4e7eb75fd2e674f1fd8f289728a"}], "title": "mctp: route: hold key->lock in mctp_flow_prepare_output()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp: route: hold key->lock in mctp_flow_prepare_output()\n\nmctp_flow_prepare_output() checks key->dev and may call\nmctp_dev_set_key(), but it does not hold key->lock while doing so.\n\nmctp_dev_set_key() and mctp_dev_release_key() are annotated with\n__must_hold(&key->lock), so key->dev access is intended to be\nserialized by key->lock. The mctp_sendmsg() transmit path reaches\nmctp_flow_prepare_output() via mctp_local_output() -> mctp_dst_output()\nwithout holding key->lock, so the check-and-set sequence is racy.\n\nExample interleaving:\n\n CPU0 CPU1\n ---- ----\n mctp_flow_prepare_output(key, devA)\n if (!key->dev) // sees NULL\n mctp_flow_prepare_output(\n key, devB)\n if (!key->dev) // still NULL\n mctp_dev_set_key(devB, key)\n mctp_dev_hold(devB)\n key->dev = devB\n mctp_dev_set_key(devA, key)\n mctp_dev_hold(devA)\n key->dev = devA // overwrites devB\n\nNow both devA and devB references were acquired, but only the final\nkey->dev value is tracked for release. One reference can be lost,\ncausing a resource leak as mctp_dev_release_key() would only decrease\nthe reference on one dev.\n\nFix by taking key->lock around the key->dev check and\nmctp_dev_set_key() call."}], "id": "CVE-2026-43455", "lastModified": "2026-05-12T14:10:27.343", "metrics": {}, "published": "2026-05-08T15:16:58.263", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0695712f3a6f1a48915f95767cfb42077683dcdc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47893166bc5611ee9a20de6b8d2933b2320fb772"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d86aa41c073c4e7eb75fd2e674f1fd8f289728a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86f5334fcb48a5b611c33364ab52ca684d0f6d91"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8d27d9b260dd19c1b519e1a13de6448f9984e30e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/925a5ffd99cddd7a7e41d5ad120c7a2c6d50260f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: mctp: route: hold key->lock in mctp_flow_prepare_output()", "id": "2468265", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468265"}, "csaw": false, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's Message Control Transport Protocol (MCTP) module. A race condition exists in the `mctp_flow_prepare_output()` function where a lock is not properly held during a critical check-and-set operation. This can lead to multiple device references being acquired without proper tracking for release, resulting in a resource leak. Over time, this resource leak could potentially lead to system instability or a denial of service."], "name": "CVE-2026-43455", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43455\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43455\nhttps://lore.kernel.org/linux-cve-announce/2026050859-CVE-2026-43455-3fb2@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,47893166bc5611ee9a20de6b8d2933b2320fb772)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,86f5334fcb48a5b611c33364ab52ca684d0f6d91)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,0695712f3a6f1a48915f95767cfb42077683dcdc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,925a5ffd99cddd7a7e41d5ad120c7a2c6d50260f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,8d27d9b260dd19c1b519e1a13de6448f9984e30e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[67737c457281dd199ceb9e31b6ba7efd3bfe566d,7d86aa41c073c4e7eb75fd2e674f1fd8f289728a)"}}], "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": "generic", "value": "5.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-08T17:00:16.207078+00:00", "updated": "2026-05-09T16:00:13.045684+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}