Medium [CVE-2026-64383] fix double-free in SMB2_flush replay
This medium-severity Red Hat Linux advisory covers CVE-2026-64383 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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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. This vulnerability, a double-free error within the `SMB2_flush()` replay mechanism, occurs when the system attempts to free a memory buffer twice.
A malicious SMB server could exploit this by sending a specially crafted flush response, potentially leading to memory corruption. This could result in a denial of service or, in some scenarios, arbitrary code execution.
Red Hat severity: Important — CVSS 6.4 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L). Weakness: CWE-1341.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9. Red Hat fixing advisory: RHSA-2026:71233, RHSA-2026:71232.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
- kernel-0:6.12.0-211.59.1.el10_2
- kernel-0:5.14.0-687.51.1.el9_8
- RHSA-2026:71233
- RHSA-2026:71232
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.59.1.el10_2, kernel-0:5.14.0-687.51.1.el9_8, RHSA-2026:71233, RHSA-2026:71232. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
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