Use-after-free in Linux kernel - CVE-2026-99061

Vulnerability identifier: #VU157448

CSH Severity: Low

CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-99061

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause a denial of service by crashing the kernel.

The vulnerability exists due to a use-after-free caused by a race condition in the brcmfmac driver's brcmf_detach() function when driver removal overlaps with removal of a P2P device interface by an exiting user-space process. A local privileged user can remove the driver while the process that created the P2P device is still exiting to trigger duplicate interface unregistration and access to freed memory, causing a kernel crash.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/08a3f02fea636e97a7422d1512f76dacdb5b0887
• https://git.kernel.org/stable/c/2e0c8c60a11b3177e7432c71d41249e276a0825f
• https://git.kernel.org/stable/c/47ca6395a1d91545cc9403f9218bc61be941a0c3
• https://git.kernel.org/stable/c/7b79131e357c4786765b20a994ad40d4d35f2163
• https://git.kernel.org/stable/c/eef16a74ff8ed2a838d6bb862bb2c7783fce7466

• Use-after-free in Linux kernel brcm80211 brcmfmac driver
• SUSE update for the Linux Kernel