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. 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 versions
Linux kernel versions
6.6.32,
6.8
and later are affected. Fixed in
6.6.145,
6.12.96,
6.18.39,
7.1.4,
7.2-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-64383?
CVE-2026-64383 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.32 onward and has been patched in 6.6.145, 6.12.96, 6.18.39 and others. CVE-2026-64383 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64383?
Yes. CVE-2026-64383 has been patched. Fixed versions include 6.6.145, 6.12.96, 6.18.39 and others. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64383 actively exploited?
No. CVE-2026-64383 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.