High [CVE-2026-64386] fix query_info replay double-free
This high-severity Red Hat Linux advisory covers CVE-2026-64386 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 query_info() replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_info_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 can happen if an error occurs during the initialization of an SMB2 query before the next data send, leading to the same memory being freed twice.
Such an issue can result in memory corruption, potentially causing a denial of service (DoS) condition for the system. 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; Red Hat Hardened Images as not affected. Red Hat fixing advisory: RHSA-2026:57251, RHSA-2026:77634, RHSA-2026:57252, RHSA-2026:77219.
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 28 days ago·verify at source
- kernel-0:6.12.0-211.49.1.el10_2
- kernel-0:6.12.0-55.109.1.el10_0
- kernel-0:5.14.0-687.41.1.el9_8
- kernel-0:5.14.0-570.147.1.el9_6
- RHSA-2026:57251
- RHSA-2026:77634
- RHSA-2026:57252
- RHSA-2026:77219
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.49.1.el10_2, kernel-0:6.12.0-55.109.1.el10_0, kernel-0:5.14.0-687.41.1.el9_8, kernel-0:5.14.0-570.147.1.el9_6, RHSA-2026:57251, RHSA-2026:77634. 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 28 days ago·verify at source
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