Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate absolute native symlink targets before NT fixups With symlinkroot unset, an absolute target is copied without conversion to an NT drive path. Later code still assumes an NT prefix is present when modifying the target and calculating the print name length. For "/ab", this causes two failures: sym[5] and path[5] are written past their allocations, and plen -= 2 * poff subtracts an assumed 8-byte prefix from a 6-byte UTF-16 target, wrapping u16 plen to 65534. That underflow causes another overflow: memcpy() copies 65534 bytes into a 24-byte buffer. A user with write access to a mounted share can trigger these bugs with default settings. Validate the NT drive prefix, including an ASCII drive letter, before accessing fixed offsets or subtracting the prefix length.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
3363da82e02f1bddc54faa92ea430c6532e2cd2e to < 6913ff607c2bc8694193e1fcc40bf16d75f35f16affected3363da82e02f1bddc54faa92ea430c6532e2cd2e to < 23c240d9509e15f72e4112fc95f0160ab32ec430affectedb6ea7b6c6be65149ab6b8e37a9dd1671f76add1baffected6.15.6 to < 6.16affected
Linux Linux
Default version status: affected
6.16affected0 to < 6.16unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected