{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26936", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.196Z", "datePublished": "2024-05-01T05:26:51.773Z", "dateUpdated": "2026-08-05T11:28:27.772Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:28:27.772Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate request buffer size in smb2_allocate_rsp_buf()\n\nThe response buffer should be allocated in smb2_allocate_rsp_buf\nbefore validating request. But the fields in payload as well as smb2 header\nis used in smb2_allocate_rsp_buf(). This patch add simple buffer size\nvalidation to avoid potencial out-of-bounds in request buffer." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is in ksmbd, the in-kernel SMB server processing requests received on TCP port 445; the OOB read is driven entirely by fields in a remotely supplied SMB2 packet, making it remotely reachable over the network.\nAC:L - A single crafted SMB2 QUERY_INFO / transform request deterministically triggers the field read on an undersized buffer, with no race or unpredictable precondition the attacker cannot control.\nPR:N - In the affected code smb2_allocate_rsp_buf() runs before init_rsp_hdr and before check_user_session, and in the original ordering before decryption/session lookup, so a crafted (transform) request reaches the OOB read pre-authentication—consistent with the paired CVE-2024-26980.\nUI:N - The attacker sends the malformed request directly to the server; no action by any local user or victim is required.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority; no VM, hypervisor, IOMMU, or sandbox boundary is crossed.\nC:L - The read goes out of bounds by a couple of bytes (InfoType/FileInfoClass) of adjacent slab memory; it is strictly bounded to a few bytes and feeds only an internal size decision, so limited rather than arbitrary disclosure.\nI:N - The defect is purely an out-of-bounds read used to size the response buffer; there is no out-of-bounds write, freed-object reuse, or type confusion, so no data can be modified.\nA:H - Reading past a small slab allocation into a redzone or unmapped region produces a KASAN-detected slab-out-of-bounds and can oops/panic the kernel, and the request can be repeated at will, yielding a remote denial of 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/smb2pdu.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "8f3d0bf1d0c62b539d54c5b9108a845cff619b99", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "21ff9d7d223c5c19cb4334009e4c0c83a2f4d674", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "5c20b242d4fed73a93591e48bfd9772e2322fb11", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "17cf0c2794bdb6f39671265aa18aea5c22ee8c4a", "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/smb2pdu.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.159", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.88", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.29", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.8", "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": "5.15.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.29" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.8.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99" }, { "url": "https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674" }, { "url": "https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11" }, { "url": "https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6" }, { "url": "https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a" } ], "title": "ksmbd: validate request buffer size in smb2_allocate_rsp_buf()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-26936", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-10T18:35:18.289818Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T17:22:47.084Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:21:05.890Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8f3d0bf1d0c62b539d54c5b9108a845cff619b99", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/21ff9d7d223c5c19cb4334009e4c0c83a2f4d674", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/5c20b242d4fed73a93591e48bfd9772e2322fb11", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a", "tags": [ "x_transferred" ] } ] } ] } }