Use-after-free in Linux kernel - CVE-2026-99035

Vulnerability identifier: #VU157470

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-2026-99035

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to potentially cause a denial of service through a kernel crash.

The vulnerability exists due to use-after-free in the mtk-sd MMC host driver when driver unbinding overlaps with an active request timeout callback. A local privileged user can trigger this overlap to cause the callback to access freed host memory, potentially crashing the kernel.

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/46e75703ca3f00fb8c935b3ce35b90836e34e8af
• https://git.kernel.org/stable/c/9e799f25c420e759641eb25102967ea091fc758f
• https://git.kernel.org/stable/c/b38af5386a74416e898955443f2e26547b358cb2
• https://git.kernel.org/stable/c/edef1355224c0799a502a46b71d3649fa0dd218e
• https://git.kernel.org/stable/c/f37e0367ad6f2147a0b37564b442b7a25bec0d23

• Use-after-free in Linux kernel mmc host driver
• SUSE update for the Linux Kernel