Double free in Linux kernel - CVE-2026-64597

Vulnerability identifier: #VU141259

CSH Severity: Medium

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64597

CWE-ID: CWE-415

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to double free in SMB2_close() in the SMB client close request handling when processing a response-bearing attempt that returns a replayable error. A remote user can trigger a replay sequence that causes the same response buffer to be freed twice to cause a denial of service.

Linux kernel
openEuler
kernel
bpftool
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-extra-modules
kernel-headers
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python3-perf
python3-perf-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 6.6.0-145.3.29.160
bpftool - update to 6.6.0-145.3.29.160
bpftool-debuginfo - update to 6.6.0-145.3.29.160
kernel-debuginfo - update to 6.6.0-145.3.29.160
kernel-debugsource - update to 6.6.0-145.3.29.160
kernel-devel - update to 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
kernel-headers - update to 6.6.0-145.3.29.160
kernel-source - update to 6.6.0-145.3.29.160
kernel-tools - update to 6.6.0-145.3.29.160
kernel-tools-debuginfo - update to 6.6.0-145.3.29.160
kernel-tools-devel - update to 6.6.0-145.3.29.160
perf - update to 6.6.0-145.3.29.160
perf-debuginfo - update to 6.6.0-145.3.29.160
python3-perf - update to 6.6.0-145.3.29.160
python3-perf-debuginfo - update to 6.6.0-145.3.29.160

• https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3
• https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a
• https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1
• https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13
• https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee

• Double free in Linux kernel smb client
• openEuler 24.03 LTS SP3 update for kernel