{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26811", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.180Z", "datePublished": "2024-04-08T10:02:18.184Z", "dateUpdated": "2026-08-05T11:27:30.296Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:30.296Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate payload size in ipc response\n\nIf installing malicious ksmbd-tools, ksmbd.mountd can return invalid ipc\nresponse to ksmbd kernel server. ksmbd should validate payload size of\nipc response from ksmbd.mountd to avoid memory overrun or\nslab-out-of-bounds. This patch validate 3 ipc response that has payload." } ], "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 vulnerable parsing lives in the in-kernel SMB3 server (fs/smb/server/) and is only entered on behalf of a remote client's SMB2 SESSION_SETUP, TREE_CONNECT, or DCERPC-over-IPC$ request, and the over-read bytes are copied straight back into the SMB response sent to that client over TCP/445.\nAC:L - The kernel unconditionally trusts the embedded length fields, so no memory-layout luck is needed; where handle reuse after the 2 s IPC timeout is involved the attacker drives both sides by opening many connections and issuing concurrent requests to stall ksmbd.mountd, which the rubric treats as attacker-created and therefore Low.\nPR:N - One of the three responses this patch validates (SPNEGO_AUTHEN) is consumed inside ksmbd_krb5_authenticate() during SMB2 SESSION_SETUP, before the client's credentials are verified, and the over-read blob is written into the response returned to that unauthenticated client; the share-config and IPC$ RPC paths are additionally reachable via guest/anonymous sessions that ksmbd-tools enables by default.\nUI:N - The attacker triggers the IPC transaction entirely on their own by sending SMB2 requests to the listening server; no local user or administrator has to perform any action.\nS:U - The out-of-bounds access and its consequences are confined to the kernel that hosts the ksmbd server; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - smb2_read_pipe() memcpys rpc_resp->payload_sz bytes out of a short slab object and returns them verbatim to the client as SMB2 READ data, and ksmbd_krb5_authenticate() ships spnego_blob_len over-read bytes back in the SESSION_SETUP SecurityBuffer — a large, directly exfiltrated kernel heap disclosure.\nI:H - Because a wrong-type response is accepted and reinterpreted, security-critical state is built from out-of-bounds slab memory: ksmbd_alloc_user() derives the session's uid/gid/status flags from an OOB login_response, and share->path is kstrdup'd from bytes past the object, letting the server grant a session under an unintended identity or root a share at an unintended path.\nA:H - An unvalidated payload_sz drives kvmalloc() of an arbitrary u32 size and a matching memcpy from a much smaller allocation, so the slab-out-of-bounds read readily walks into unmapped memory and oopses the kernel (or trips KASAN/hardened usercopy), killing the SMB service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/ksmbd_netlink.h", "fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "88b7f1143b15b29cccb8392b4f38e75b7bb3e300", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "51a6c2af9d20203ddeeaf73314ba8854b38d01bd", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a637fabac554270a851033f5ab402ecb90bc479c", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "76af689a45aa44714b46d1a7de4ffdf851ded896", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "a677ebd8ca2f2632ccdecbad7b87641274e15aac", "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/ksmbd_netlink.h", "fs/smb/server/mgmt/share_config.c", "fs/smb/server/transport_ipc.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.157", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.85", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.26", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.5", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.15.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.85" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.26" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.8.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/88b7f1143b15b29cccb8392b4f38e75b7bb3e300" }, { "url": "https://git.kernel.org/stable/c/51a6c2af9d20203ddeeaf73314ba8854b38d01bd" }, { "url": "https://git.kernel.org/stable/c/a637fabac554270a851033f5ab402ecb90bc479c" }, { "url": "https://git.kernel.org/stable/c/76af689a45aa44714b46d1a7de4ffdf851ded896" }, { "url": "https://git.kernel.org/stable/c/a677ebd8ca2f2632ccdecbad7b87641274e15aac" } ], "title": "ksmbd: validate payload size in ipc response", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/88b7f1143b15b29cccb8392b4f38e75b7bb3e300", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/51a6c2af9d20203ddeeaf73314ba8854b38d01bd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a637fabac554270a851033f5ab402ecb90bc479c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/76af689a45aa44714b46d1a7de4ffdf851ded896", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/a677ebd8ca2f2632ccdecbad7b87641274e15aac", "tags": [ "x_transferred" ] }, { "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6XCNJZBDMGJXRIKLGKM4RRJU4XCHPX62/" }, { "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RO3RO34MLQ6WT3A7O6STQUVXW43N6W3K/" }, { "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LG6L4FXO4WNWUM6W7USOH2YTRVWREM3V/" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-04T22:06:01.323Z" } }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26811", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:50:30.655244Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:43.255Z" } } ] } }