High [CVE-2026-64384] fix change notify replay double-free
This high-severity Red Hat Linux advisory covers CVE-2026-64384 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 change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_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 vulnerability occurs due to a double-free error when handling change notify replies.
If a response attempt returns a replayable error and frees its buffer, and then SMB2_notify_init() fails, the same buffer can be freed again. This can lead to memory corruption and potentially a denial of service.
Red Hat severity: Moderate — 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 9. Red Hat fixing advisory: RHSA-2026:61887, RHSA-2026:64808.
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-0:6.12.0-211.50.1.el10_2
- kernel-0:5.14.0-687.45.1.el9_8
- RHSA-2026:61887
- RHSA-2026:64808
Official advisory · high-confidence parse· fetched 28 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.50.1.el10_2, kernel-0:5.14.0-687.45.1.el9_8, RHSA-2026:61887, RHSA-2026:64808. 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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