CVE-2026-64383
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.46% probability · 38th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-415
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15dPatch
- https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adafPatch
- https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5aPatch
- https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedbPatch
- https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515dPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.