High [CVE-2026-64382] fix double-free in SMB2_open replay
This high-severity Red Hat Linux advisory covers CVE-2026-64382 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, 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_open() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_init() fails before the next send, cleanup retains the previous buffer type and frees that response again.
Reset response bookkeeping before each attempt to prevent the stale free. This occurs when a response-bearing attempt returns a replayable error and frees its response buffer, and then the cleanup process attempts to free the same buffer again.
This memory corruption vulnerability could potentially lead to a denial of service or, in some cases, arbitrary code execution. Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).
Weakness: CWE-1341. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat lists Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8 as not affected. Red Hat fixing advisory: RHSA-2026:57251, RHSA-2026:69089, RHSA-2026:57252, RHSA-2026:67720.
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 27 days ago·verify at source
- kernel-0:6.12.0-211.49.1.el10_2
- kernel-0:6.12.0-55.105.1.el10_0
- kernel-0:5.14.0-687.41.1.el9_8
- kernel-0:5.14.0-570.141.1.el9_6
- RHSA-2026:57251
- RHSA-2026:69089
- RHSA-2026:57252
- RHSA-2026:67720
Official advisory · high-confidence parse· fetched 27 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.49.1.el10_2, kernel-0:6.12.0-55.105.1.el10_0, kernel-0:5.14.0-687.41.1.el9_8, kernel-0:5.14.0-570.141.1.el9_6, RHSA-2026:57251, RHSA-2026:69089. 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 27 days ago·verify at source
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