{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74659", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.924Z", "datePublished": "2026-08-22T15:32:32.926Z", "dateUpdated": "2026-08-22T15:32:32.926Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:32.926Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mrp: fix uninitialised bytes on the wire\n\nbr_mrp_alloc_test_skb() builds MRP test frames on an skb from\ndev_alloc_skb(), which does not clear the linear data area. On the MRA\nring-role branch the sub-option TLV header is appended with\n\n\tsub_tlv = skb_put(skb, sizeof(*sub_tlv));\n\tsub_tlv->type = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR;\n\nso sub_tlv->length is never written, and the two trailing alignment bytes\nare appended with a bare skb_put() that does not clear them either. The\nneighbouring oui and sub_opt regions are explicitly zeroed, so three\nuninitialised bytes are left in every MRA MRP_Test frame that goes out.\n\nPut the sub-option TLV header and the alignment padding in a single\nskb_put_zero(), which clears both. The AUTO_MGR sub-TLV carries no\npayload, so the zeroed length field is already the value it should have."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/br_mrp.c"], "versions": [{"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "014c062d23c63ec77ef2cf17a0d9363c7441cc94", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "7ebc23ff03668042e0b0e4034bb1518d36198d9e", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "06d58b8d2f053ced82e01efaeb6e7c82891eed58", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "a5e385eeb2d6dbbbdebfa050e67c34734ae12693", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "5912cf1822fbe53ae275c147868740eb384a5d3e", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "e08665218040f8e312abe40f74543186f3c2c941", "status": "affected", "versionType": "git"}, {"version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "lessThan": "63488dba65ef91373ef616575b32eb0eb21459f4", "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/bridge/br_mrp.c"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.14", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/014c062d23c63ec77ef2cf17a0d9363c7441cc94"}, {"url": "https://git.kernel.org/stable/c/7ebc23ff03668042e0b0e4034bb1518d36198d9e"}, {"url": "https://git.kernel.org/stable/c/06d58b8d2f053ced82e01efaeb6e7c82891eed58"}, {"url": "https://git.kernel.org/stable/c/a5e385eeb2d6dbbbdebfa050e67c34734ae12693"}, {"url": "https://git.kernel.org/stable/c/5912cf1822fbe53ae275c147868740eb384a5d3e"}, {"url": "https://git.kernel.org/stable/c/e08665218040f8e312abe40f74543186f3c2c941"}, {"url": "https://git.kernel.org/stable/c/63488dba65ef91373ef616575b32eb0eb21459f4"}], "title": "net: bridge: mrp: fix uninitialised bytes on the wire", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/br_mrp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "014c062d23c63ec77ef2cf17a0d9363c7441cc94", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "7ebc23ff03668042e0b0e4034bb1518d36198d9e", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "06d58b8d2f053ced82e01efaeb6e7c82891eed58", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "a5e385eeb2d6dbbbdebfa050e67c34734ae12693", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "5912cf1822fbe53ae275c147868740eb384a5d3e", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "e08665218040f8e312abe40f74543186f3c2c941", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}, {"lessThan": "63488dba65ef91373ef616575b32eb0eb21459f4", "status": "affected", "version": "f7458934b0791c39a001e4d902fc3bf697b439b5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/br_mrp.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"lessThan": "5.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mrp: fix uninitialised bytes on the wire\n\nbr_mrp_alloc_test_skb() builds MRP test frames on an skb from\ndev_alloc_skb(), which does not clear the linear data area. On the MRA\nring-role branch the sub-option TLV header is appended with\n\n\tsub_tlv = skb_put(skb, sizeof(*sub_tlv));\n\tsub_tlv->type = BR_MRP_SUB_TLV_HEADER_TEST_AUTO_MGR;\n\nso sub_tlv->length is never written, and the two trailing alignment bytes\nare appended with a bare skb_put() that does not clear them either. The\nneighbouring oui and sub_opt regions are explicitly zeroed, so three\nuninitialised bytes are left in every MRA MRP_Test frame that goes out.\n\nPut the sub-option TLV header and the alignment padding in a single\nskb_put_zero(), which clears both. The AUTO_MGR sub-TLV carries no\npayload, so the zeroed length field is already the value it should have."}], "id": "CVE-2026-74659", "lastModified": "2026-08-22T16:16:39.613", "metrics": {}, "published": "2026-08-22T16:16:39.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/014c062d23c63ec77ef2cf17a0d9363c7441cc94"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06d58b8d2f053ced82e01efaeb6e7c82891eed58"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5912cf1822fbe53ae275c147868740eb384a5d3e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63488dba65ef91373ef616575b32eb0eb21459f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7ebc23ff03668042e0b0e4034bb1518d36198d9e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a5e385eeb2d6dbbbdebfa050e67c34734ae12693"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e08665218040f8e312abe40f74543186f3c2c941"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,014c062d23c63ec77ef2cf17a0d9363c7441cc94)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,7ebc23ff03668042e0b0e4034bb1518d36198d9e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,06d58b8d2f053ced82e01efaeb6e7c82891eed58)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,a5e385eeb2d6dbbbdebfa050e67c34734ae12693)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,5912cf1822fbe53ae275c147868740eb384a5d3e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,e08665218040f8e312abe40f74543186f3c2c941)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f7458934b0791c39a001e4d902fc3bf697b439b5,63488dba65ef91373ef616575b32eb0eb21459f4)"}}], "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": "5.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"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": "2026-08-22T19:30:17.494911+00:00", "updated": "2026-08-22T19:45:03.037281+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-758", "CWE-788"]}