{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50283", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.984Z", "datePublished": "2024-11-19T01:30:25.968Z", "dateUpdated": "2026-08-05T11:43:02.613Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:43:02.613Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-use-after-free in smb3_preauth_hash_rsp\n\nksmbd_user_session_put should be called under smb3_preauth_hash_rsp().\nIt will avoid freeing session before calling smb3_preauth_hash_rsp()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in ksmbd, the in-kernel SMB server, and is reached purely by sending SMB2 NEGOTIATE/SESSION_SETUP packets to TCP port 445 (or SMB-Direct/RDMA). No local access is required.\nAC:L - The attacker controls both sides of the race — one pipelined SESSION_SETUP is made to fail (marking the session EXPIRED and dropping refcnt to 0 at the premature put), while a second concurrent SESSION_SETUP on the same connection invokes ksmbd_expire_session() to free it, with requests served in parallel by ksmbd-io kworkers. Attempts are cheap and unlimited since no authentication or delay gates the path.\nPR:N - The entire path is pre-authentication: ksmbd_smb2_session_create() runs on a SESSION_SETUP with SessionId==0 before any credential check, and the failing setup can be triggered by a malformed negotiate blob (-EINVAL) with no valid user. No SMB credentials or local account are needed.\nUI:N - Exploitation requires only that the target has ksmbd running and reachable; the attacker sends all traffic itself with no victim action involved.\nS:U - The freed object, the corrupting write, and the impact all reside within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a slab use-after-free on struct ksmbd_session, and after heap reclaim smb3_preauth_hash_rsp() reads the attacker-supplied Preauth_HashValue pointer and feeds 64 bytes from that address into SHA-512, yielding a controlled kernel-memory read primitive on top of the freed-object disclosure.\nI:H - crypto_shash_final() writes a 64-byte SHA-512 digest through the attacker-controlled Preauth_HashValue pointer taken from the reclaimed session object, giving a remote arbitrary kernel write suitable for control-flow hijacking; the UAF itself also enables standard heap-spray exploitation.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free / oops, and the write through a bogus pointer read from freed memory panics the kernel, taking down the whole system remotely and repeatably." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/server.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "cb645064e0811053c94e86677f2e58ed29359d62", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "f7557bbca40d4ca8bb1c6c940ac6c95078bd0827", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "c6cdc08c25a868a08068dfc319fa9fce982b8e7f", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1b6ad475d4ed577d34e0157eb507be00c588bf5c", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b8fc56fbca7482c1e5c0e3351c6ae78982e25ada", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/server.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.174", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.117", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.61", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.8", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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", "versionEndExcluding": "5.15.174" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.117" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.11.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cb645064e0811053c94e86677f2e58ed29359d62" }, { "url": "https://git.kernel.org/stable/c/f7557bbca40d4ca8bb1c6c940ac6c95078bd0827" }, { "url": "https://git.kernel.org/stable/c/c6cdc08c25a868a08068dfc319fa9fce982b8e7f" }, { "url": "https://git.kernel.org/stable/c/1b6ad475d4ed577d34e0157eb507be00c588bf5c" }, { "url": "https://git.kernel.org/stable/c/b8fc56fbca7482c1e5c0e3351c6ae78982e25ada" } ], "title": "ksmbd: fix slab-use-after-free in smb3_preauth_hash_rsp", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50283", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-03-06T16:08:00.711339Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-03-06T16:14:33.216Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:28:04.991Z" } } ] } }