{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"1ba1937de005e261a8858f45bfef5da7458df94c","status":"affected","version":"d8e050398d23ef7c019c96200b80d73f4e5cec0c","versionType":"git"},{"lessThan":"2ec9cdf469dd32bcf33073aeb30c08e9356e0ca1","status":"affected","version":"d8e050398d23ef7c019c96200b80d73f4e5cec0c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"3.7"},{"lessThan":"3.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.3.*","status":"unaffected","version":"7.3.2","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.4-rc1","versionType":"original_commit_for_fix"}]}],"cveId":"CVE-2026-99272","cwes":[],"description":"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.","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1794060525332,"publishedAt":1794060525332,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/1ba1937de005e261a8858f45bfef5da7458df94c"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/2ec9cdf469dd32bcf33073aeb30c08e9356e0ca1"}],"remediation":[],"revision":"3906e3dd3f8164bc36d9ae5cbd1ab815aa6ce298aa3506d3d21639ef9e696ac7","sources":[{"modifiedAt":1794060525332,"name":"CNA: Linux","retrievedAt":1794064150875,"url":"https://www.cve.org/CVERecord?id=CVE-2026-99272"}],"ssvc":null,"status":"published","title":"smb: client: validate the data area in SMB2_read()","updatedAt":1794064150875}