{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74694","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.926Z","datePublished":"2026-08-22T15:32:57.113Z","dateUpdated":"2026-08-22T15:32:57.113Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-22T15:32:57.113Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length\n\nncsi_send_cmd_nl() takes the number of bytes to copy from the\nattacker-controlled ncsi_pkt_hdr.length field of the in-band packet\nheader, while the source buffer is the NCSI_ATTR_DATA netlink\nattribute whose readable size is nla_len() - sizeof(ncsi_pkt_hdr).\nThe two length sources are never cross-checked: only\nnla_len() >= sizeof(struct ncsi_pkt_hdr) is enforced.\n\nWith hdr->length set larger than the attribute payload (up to 65535\nagainst at most 2032 readable bytes), ncsi_cmd_handler_oem() copies\npast the end of the netlink attribute buffer with unsafe_memcpy(),\nleaking up to ~64KB of kernel heap memory into the transmitted NCSI\ncommand packet. The destination skb is sized by the declared payload,\nso the write side does not overflow - this is a pure OOB read /\ninformation leak, reachable with CAP_NET_ADMIN on systems with a\nregistered NCSI device (e.g. OpenBMC on Aspeed BMC SoCs, where\nNET_NCSI=y is standard).\n\nReject commands whose declared payload extends past the end of the\ndata attribute.\n\nThe issue was found by the autokbug dynamic kernel fuzzer at Tencent\nYunding Lab."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ncsi/ncsi-netlink.c"],"versions":[{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"e60afa01d35f8b2671b27ca93309921427144cce","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"67c72b8ef63d9d9a610546fda30b116638f39745","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"4489b4a17892750131e4bef4bc1d3d703c8fb5ba","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"43c7d0a6917751ea898ae584d00f24f5deac46d4","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"b5231ad0b376b801ab8cf2962b182cc29deaedb3","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"02226af69362758046822840fc6a497f5de33f00","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"3a60b5af75abe8e3494ccd074fb4ae6e601a3e55","status":"affected","versionType":"git"},{"version":"9771b8ccdfa6dcb1ac5128ca7fe8649f3092d392","lessThan":"afa58b7384913c8773d837acdb07b035690ec5d2","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-netlink.c"],"versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","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":"4.20","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e60afa01d35f8b2671b27ca93309921427144cce"},{"url":"https://git.kernel.org/stable/c/67c72b8ef63d9d9a610546fda30b116638f39745"},{"url":"https://git.kernel.org/stable/c/4489b4a17892750131e4bef4bc1d3d703c8fb5ba"},{"url":"https://git.kernel.org/stable/c/43c7d0a6917751ea898ae584d00f24f5deac46d4"},{"url":"https://git.kernel.org/stable/c/b5231ad0b376b801ab8cf2962b182cc29deaedb3"},{"url":"https://git.kernel.org/stable/c/02226af69362758046822840fc6a497f5de33f00"},{"url":"https://git.kernel.org/stable/c/3a60b5af75abe8e3494ccd074fb4ae6e601a3e55"},{"url":"https://git.kernel.org/stable/c/afa58b7384913c8773d837acdb07b035690ec5d2"}],"title":"net/ncsi: fix heap OOB read in NCSI_CMD_SEND_CMD payload length","x_generator":{"engine":"bippy-1.2.0"}}}}