CVE-2026-64383

Summary

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

smb: client: fix double-free in SMB2_flush() replay

SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time.

Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux433042a91f9373241307725b52de573933ffedbf < 6e27f40b682a5e42a2daae3ce6d96f0e0e16dedbaffected
LinuxLinux4f1fffa2376922f3d1d506e49c0fd445b023a28e < 878757163eea684750107a31ea134c103863515daffected
LinuxLinux4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3407240cde132a4b72d6429a2625a09a2f78adafaffected
LinuxLinux4f1fffa2376922f3d1d506e49c0fd445b023a28e < 013a9a3da46c5dabcf18f65ea6a47874ba12a15daffected
LinuxLinux4f1fffa2376922f3d1d506e49c0fd445b023a28e < 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5aaffected
LinuxLinux6.6.32 < 6.6.145affected
LinuxLinux6.8affected
LinuxLinux0 < 6.8unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References