Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment smb2_get_ea() applies 4-byte alignment padding via memset() after writing each EA entry. The bounds check on buf_free_len is performed before the value memcpy, but the alignment memset fires unconditionally afterward with no check on remaining space. When the EA value exactly fills the remaining buffer (buf_free_len == 0 after value subtraction), the alignment memset writes 1-3 NUL bytes past the buf_free_len boundary. In compound requests where the response buffer is shared across commands, the first command (e.g., READ) can consume most of the buffer, leaving a tight remainder for the QUERY_INFO EA response. The alignment memset then overwrites past the physical kvmalloc allocation into adjacent kernel heap memory. Add a bounds check before the alignment memset to ensure buf_free_len can accommodate the padding bytes. This is the same bug pattern fixed by commit beef2634f81f ("ksmbd: fix potencial OOB in get_file_all_info() for compound requests") and commit fda9522ed6af ("ksmbd: fix OOB write in QUERY_INFO for compound requests"), both of which added bounds checks before unconditional writes in QUERY_INFO response handlers.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 before ddbbc8b2a09dd2cfed90871313e3691ae1db08a2; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before ffbce350c6fd1e99116ea57383b9031717e36d3b; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 98f3de6ef4efbd899348d333f0902dc4ff14380c; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 790304c02bf9bd7b8171feda4294d6e62d32ae8f; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 922d48fe8c19f388ffa2f709f33acaae4e408de2; affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d before 30010c952077a1c89ecdd71fc4d574c75a8f5617; affected f2283680a80571ca82d710bc6ecd8f8beac67d63; affected 6.1.71 before 6.1.175; affected 5.15.145 before 5.16 |
| Linux / Linux | affected 6.6; unaffected 0 before 6.6; unaffected 6.1.175 through 6.1.*; unaffected 6.6.136 through 6.6.*; unaffected 6.12.84 through 6.12.*; unaffected 6.18.25 through 6.18.*; unaffected 7.0.2 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ddbbc8b2a09dd2cfed90871313e3691ae1db08a2
- https://git.kernel.org/stable/c/ffbce350c6fd1e99116ea57383b9031717e36d3b
- https://git.kernel.org/stable/c/98f3de6ef4efbd899348d333f0902dc4ff14380c
- https://git.kernel.org/stable/c/790304c02bf9bd7b8171feda4294d6e62d32ae8f
- https://git.kernel.org/stable/c/922d48fe8c19f388ffa2f709f33acaae4e408de2
- https://git.kernel.org/stable/c/30010c952077a1c89ecdd71fc4d574c75a8f5617
ADP enrichment
No English description supplied.