CVE-2026-99272 is a vulnerability in Linux Kernel
Published on November 7, 2026
smb: client: validate the data area in SMB2_read()
In the Linux kernel, the following vulnerability has been resolved:
smb: client: validate the data area in SMB2_read()
SMB2_read() copies le32_to_cpu(rsp->DataLength) bytes from
(char *)rsp + rsp->DataOffset without checking that the range lies
within the response actually received. A READ response with
DataOffset == 0 makes smb2_get_data_area_len() zero the data length, so
smb2_check_message() accepts a frame as short as the fixed response,
while SMB2_read() still uses the server-supplied DataLength, capped only
by CIFS_MAX_MSGSIZE and the caller's length.
A malicious server can answer the synchronous read used by the
mfsymlinks (or SFU) symlink parser with an 81-byte READ response
carrying DataOffset 0 and DataLength 1067, making the client copy 1067
bytes from a 448-byte receive object (KASAN slab-out-of-bounds; up to
16 KiB in the general case).
Clamp a zero (or header-overlapping) DataOffset to read_rsp_size, as
handle_read_data() does for the asynchronous path, and reject the
response unless DataOffset + DataLength fits within rsp_iov.iov_len.
The SMB1 helper was fixed the same way in 5be5bdda5863.
Products Associated with CVE-2026-99272
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Affected Versions
Linux:- Version d8e050398d23ef7c019c96200b80d73f4e5cec0c and below 1ba1937de005e261a8858f45bfef5da7458df94c is affected.
- Version d8e050398d23ef7c019c96200b80d73f4e5cec0c and below 2ec9cdf469dd32bcf33073aeb30c08e9356e0ca1 is affected.
- Version 3.7 is affected.
- Before 3.7 is unaffected.
- Version 7.3.2, <= 7.3.* is unaffected.
- Version 7.4-rc1, <= * is unaffected.