CVE-2026-64379 PUBLISHED

smb: client: mask server-provided mode to 07777 in modefromsid

Assigner: Linux
Reserved: 19.07.2026 Published: 25.07.2026 Updated: 25.07.2026

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

smb: client: mask server-provided mode to 07777 in modefromsid

When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to 07777. Apply the correct masking, same as in the read path.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to 5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14 (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to ee2216dbdf0c677e89bb43e03247dba590ed00ef (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to f511807feee7cb29b61bdfa86472c7e9e2e5df94 (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to 08c600b7e1818539ba5efee4cdb06215c245ca78 (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to c6c484a7d5bff6b929a86d7ed5130f29834c6a0d (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to f80add1bfb3425100a325b14f19648e75669a954 (excl.)
  • affected from e2f8fbfb8d09c06decde162090fac3ee220aa280 to e3d9c7160d483fc8f9e225aafad8ecbbc43f3151 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.4 is affected
  • unaffected from 0 to 5.4 (excl.)
  • unaffected from 5.10.261 to 5.10.* (incl.)
  • unaffected from 5.15.212 to 5.15.* (incl.)
  • unaffected from 6.1.178 to 6.1.* (incl.)
  • unaffected from 6.6.145 to 6.6.* (incl.)
  • unaffected from 6.12.96 to 6.12.* (incl.)
  • unaffected from 6.18.39 to 6.18.* (incl.)
  • unaffected from 7.1.4 to 7.1.* (incl.)
  • unaffected from 7.2-rc3 to * (incl.)

References