Tracker / CVE-2026-31611
CVE-2026-31611
In the Linux kernel, the following vulnerability has been resolved: ksmbd: require 3 sub-authorities before reading sub_auth[2] parse_dacl() compares each ACE SID against sid_unix_NFS_mode and on match reads sid.sub_auth[2] as the file mode. If sid_unix_NFS_mode is the prefix S-1-5-88-3 with num_subauth = 2 then compare_sids() compares only min(num_subauth, 2) sub-authorities so a client SID with num_subauth = 2 and sub_auth = {88, 3} will match. If num_subauth = 2 and the ACE is placed at the very end of the security descriptor, sub_auth[2] will be 4 bytes past end_of_acl. The out-of-band bytes will then be masked to the low 9 bits and applied as the file's POSIX mode, probably not something that is good to have happen. Fix this up by forcing the SID to actually carry a third sub-authority before reading it at all.
Prodotti e versioni affette
| linux | linux_kernel · 5.15 → 6.6.136 |
|---|---|
| linux | linux_kernel · 6.13 → 6.18.24 |
| linux | linux_kernel · 6.19 → 6.19.14 |
| linux | linux_kernel · 6.7 → 6.12.83 |
| linux | linux_kernel · 7.0 → 7.0.1 |