{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99272","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.404Z","datePublished":"2026-11-07T14:08:45.332Z","dateUpdated":"2026-11-07T14:08:45.332Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-11-07T14:08:45.332Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate the data area in SMB2_read()\n\nSMB2_read() copies le32_to_cpu(rsp->DataLength) bytes from\n(char *)rsp + rsp->DataOffset without checking that the range lies\nwithin the response actually received. A READ response with\nDataOffset == 0 makes smb2_get_data_area_len() zero the data length, so\nsmb2_check_message() accepts a frame as short as the fixed response,\nwhile SMB2_read() still uses the server-supplied DataLength, capped only\nby CIFS_MAX_MSGSIZE and the caller's length.\n\nA malicious server can answer the synchronous read used by the\nmfsymlinks (or SFU) symlink parser with an 81-byte READ response\ncarrying DataOffset 0 and DataLength 1067, making the client copy 1067\nbytes from a 448-byte receive object (KASAN slab-out-of-bounds; up to\n16 KiB in the general case).\n\nClamp a zero (or header-overlapping) DataOffset to read_rsp_size, as\nhandle_read_data() does for the asynchronous path, and reject the\nresponse unless DataOffset + DataLength fits within rsp_iov.iov_len.\nThe SMB1 helper was fixed the same way in 5be5bdda5863."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2pdu.c"],"versions":[{"version":"d8e050398d23ef7c019c96200b80d73f4e5cec0c","lessThan":"1ba1937de005e261a8858f45bfef5da7458df94c","status":"affected","versionType":"git"},{"version":"d8e050398d23ef7c019c96200b80d73f4e5cec0c","lessThan":"2ec9cdf469dd32bcf33073aeb30c08e9356e0ca1","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/client/smb2pdu.c"],"versions":[{"version":"3.7","status":"affected"},{"version":"0","lessThan":"3.7","status":"unaffected","versionType":"semver"},{"version":"7.3.2","lessThanOrEqual":"7.3.*","status":"unaffected","versionType":"semver"},{"version":"7.4-rc1","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":"3.7","versionEndExcluding":"7.3.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"7.4-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1ba1937de005e261a8858f45bfef5da7458df94c"},{"url":"https://git.kernel.org/stable/c/2ec9cdf469dd32bcf33073aeb30c08e9356e0ca1"}],"title":"smb: client: validate the data area in SMB2_read()","x_generator":{"engine":"bippy-1.2.0"}}}}