by Kastro CVE-2026-64383
Linux Linux — smb: client: fix double-free in SMB2_flush() replay
Description · from the CVE record
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
ProductAffectedFixed inSource
Linux433042a91f9373241307725b52de573933ffedbf – < 6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb6e27f40b682a5e42a2daae3ce6d96f0e0e16dedbCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 878757163eea684750107a31ea134c103863515d878757163eea684750107a31ea134c103863515dCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 3407240cde132a4b72d6429a2625a09a2f78adaf3407240cde132a4b72d6429a2625a09a2f78adafCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 013a9a3da46c5dabcf18f65ea6a47874ba12a15d013a9a3da46c5dabcf18f65ea6a47874ba12a15dCNA
Linux4f1fffa2376922f3d1d506e49c0fd445b023a28e – < 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a4be31c943a3a27a5a0251dbb8f5cb89059ec3d5aCNA
Linux6.6.32 – < 6.6.1456.6.145CNA
Linux6.86.6.145CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total