Use-after-free in Linux kernel - CVE-2026-43379

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Main Vulnerability Database Vulnerabilities #VU130797

Use-after-free in Linux kernel - CVE-2026-43379

Published: May 8, 2026


Vulnerability identifier: #VU130797
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43379
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a use-after-free in smb_lazy_parent_lease_break_close() when handling concurrent lease break close operations. A local user can trigger a race condition to cause a denial of service.


Affected software

Linux kernel
Anolis OS
Ubuntu
kernel
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-headers
kernel-devel
kernel-debug-devel
kernel-debug
bpftool
linux-azure-6.17 (Ubuntu package)
linux-oracle-6.17 (Ubuntu package)
linux-nvidia-6.17 (Ubuntu package)

How to mitigate CVE-2026-43379

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - update to 6.6.102-6
python3-perf - update to 6.6.102-6
perf - update to 6.6.102-6
kernel-tools-libs-devel - update to 6.6.102-6
kernel-tools-libs - update to 6.6.102-6
kernel-tools - update to 6.6.102-6
kernel-headers - update to 6.6.102-6
kernel-devel - update to 6.6.102-6
kernel-debug-devel - update to 6.6.102-6
kernel-debug - update to 6.6.102-6
bpftool - update to 6.6.102-6
linux-azure-6.17 (Ubuntu package) - addressed in versions 6.17.0-42.42+1, 6.17.0-1019.22, 6.17.0-1022.22, 6.17.0-1022.25, 6.17.0-1032.32
linux-oracle-6.17 (Ubuntu package) - update to 6.17.0-1020.20
linux-nvidia-6.17 (Ubuntu package) - update to 6.17.0-1031.31

External References

Related Security Bulletins