{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43373", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.006Z", "datePublished": "2026-05-08T14:21:23.875Z", "dateUpdated": "2026-08-05T12:27:33.592Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:33.592Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ncsi: fix skb leak in error paths\n\nEarly return paths in NCSI RX and AEN handlers fail to release\nthe received skb, resulting in a memory leak.\n\nSpecifically, ncsi_aen_handler() returns on invalid AEN packets\nwithout consuming the skb. Similarly, ncsi_rcv_rsp() exits early\nwhen failing to resolve the NCSI device, response handler, or\nrequest, leaving the skb unfreed." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable handlers are reached through the kernel Ethernet receive path for ETH_P_NCSI frames on an NCSI-enabled network device. A remote peer capable of delivering NCSI frames to the management interface can trigger the bug with network packets.\nAC:L - Triggering only requires malformed or unmatched NCSI response/AEN packets that take deterministic early error paths. No race, timing, or hard-to-control system state is required.\nPR:N - The packet receive path performs no credential, capability, or authentication checks before entering ncsi_rcv_rsp() or ncsi_aen_handler(). Local NCSI netlink operations may require admin permission, but the vulnerable receive path does not.\nUI:N - No victim user action is needed. Packets are processed automatically by the network receive stack.\nS:U - The impact remains within the kernel and the affected NCSI/network device security authority. There is no VM, sandbox, IOMMU, or other cross-scope boundary crossing.\nC:N - The fixed bug is a missing kfree_skb()/consume_skb() on error paths, not an information disclosure. The leaked skb is not exposed back to the attacker.\nI:N - The bug does not corrupt memory or provide a write primitive. It only retains references to received skb objects that should have been freed.\nA:H - Each trigger leaks a received skb, and the attacker can repeat this indefinitely with malformed or unmatched NCSI packets. On plausible BMC/management-controller deployments this can exhaust kernel memory and deny service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ncsi/ncsi-aen.c", "net/ncsi/ncsi-rsp.c" ], "versions": [ { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "9891d7f4f1ede473c54b49776ae07755083eef06", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "fef5aa6e3bcf3c8053307642663a63b7362d7552", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "81d6aee32f8f7bbc175c05dbf61f4430bfb88c4a", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "59962588197863d0d746879f193905c0c6b3df49", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "553366c271479c0d571dd1bb5d1bcde4747fb82e", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "b70c4e5e711931cdd56e6e905737b72f1e649189", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "87138dde2d6937b12b967f28fe598a7d59000ae4", "status": "affected", "versionType": "git" }, { "version": "138635cc27c9737f940c3aa80912ff7a61c825af", "lessThan": "5c3398a54266541610c8d0a7082e654e9ff3e259", "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/ncsi/ncsi-aen.c", "net/ncsi/ncsi-rsp.c" ], "versions": [ { "version": "4.8", "status": "affected" }, { "version": "0", "lessThan": "4.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "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": "4.8", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.18.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "6.19.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.8", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9891d7f4f1ede473c54b49776ae07755083eef06" }, { "url": "https://git.kernel.org/stable/c/fef5aa6e3bcf3c8053307642663a63b7362d7552" }, { "url": "https://git.kernel.org/stable/c/81d6aee32f8f7bbc175c05dbf61f4430bfb88c4a" }, { "url": "https://git.kernel.org/stable/c/59962588197863d0d746879f193905c0c6b3df49" }, { "url": "https://git.kernel.org/stable/c/553366c271479c0d571dd1bb5d1bcde4747fb82e" }, { "url": "https://git.kernel.org/stable/c/b70c4e5e711931cdd56e6e905737b72f1e649189" }, { "url": "https://git.kernel.org/stable/c/87138dde2d6937b12b967f28fe598a7d59000ae4" }, { "url": "https://git.kernel.org/stable/c/5c3398a54266541610c8d0a7082e654e9ff3e259" } ], "title": "net: ncsi: fix skb leak in error paths", "x_generator": { "engine": "bippy-1.2.0" } } } }