CVE-2026-98168

Summary

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix reparse buffer bounds in cifs_query_reparse_point()

In cifs_query_reparse_point(), the start >= end check before casting to struct reparse_data_buffer * only ensures the start pointer is within the response. It fails to verify that there is enough space remaining for the fixed 8-byte header of the structure.

If a server provides a DataOffset that leaves less than 8 bytes remaining, the check passes, but subsequent reads of ReparseTag and ReparseDataLength will occur out-of-bounds.

Fix this by ensuring the remaining space is at least the size of the reparse_data_buffer structure before accessing its fields.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux48ca7139ab7f0bbed95ff7a901ea497017769657 < 3d67f155fe5813cfb02a551a9a12d6ea06a902e9affected
LinuxLinux56e84c64fc257a95728ee73165456b025c48d408 < d1152c96a3002e3df6b9a5b007cecaa7b19b4f79affected
LinuxLinux56e84c64fc257a95728ee73165456b025c48d408 < 8dc5db3a0e583ea8d31d0613cefd99e93e095c3caffected
LinuxLinux56e84c64fc257a95728ee73165456b025c48d408 < 5f0306e731e2f46e91419eae57eee3a241c055e0affected
LinuxLinux848d78e3625f15de09d34a562dc49a98b78a62f3affected
LinuxLinuxc13b779d26b3702fba8f7d5fe757aba5bda85fd0affected
LinuxLinux6.12.34 < 6.12.112affected
LinuxLinux6.6.94 < 6.7affected
LinuxLinux6.15.3 < 6.16affected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References