{"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"]}]}]}}