High [CVE-2026-64387] fix query directory replay double-free
This high-severity Red Hat Linux advisory covers CVE-2026-64387 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat package: kernel-rt.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Get an email when Red Hat Linux publishes the next one.
VulniPulse checks Red Hat Linux's security advisories around the clock and emails you new ones with the severity, the fixed version and the vendor's link. First month free, then US$15/month; we email you before the first charge.
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query directory replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_directory_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, a double-free error, occurs when the client attempts to free the same memory buffer twice during a directory query operation.
An attacker could potentially exploit this flaw to cause memory corruption, leading 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-2026:63128, RHSA-2026:67114, RHSA-2026:63129, 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-0:6.12.0-211.51.1.el10_2
- kernel-0:6.12.0-55.104.1.el10_0
- kernel-0:5.14.0-687.44.1.el9_8
- kernel-0:5.14.0-570.141.1.el9_6
- RHSA-2026:63128
- RHSA-2026:67114
- RHSA-2026:63129
- RHSA-2026:67720
Official advisory · high-confidence parse· fetched 27 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.51.1.el10_2, kernel-0:6.12.0-55.104.1.el10_0, kernel-0:5.14.0-687.44.1.el9_8, kernel-0:5.14.0-570.141.1.el9_6, RHSA-2026:63128, RHSA-2026:67114. 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
More Red Hat Linux advisories
- CVE-2026-46300May 13, 2026"Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local
- CVE-2026-31431Apr 22, 2026algif_aead - Revert to operating out-of-place
- CVE-2026-34486Apr 9, 2026Missing Encryption of Sensitive Data due to EncryptInterceptor bypass
- CVE-2026-53362Jul 4, 2026account for fraggap on the paged allocation path
- CVE-2026-111497Oct 22, 2026Out-of-Bounds Write in Google Brotli Decoder
- CVE-2026-109619Oct 21, 2026fatal error handling retains stale request state leading to use-after-free
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.