CVE-2026-31651 mmc: vub300: fix NULL-deref on disconnect

What is CVE-2026-31651?

CVE-2026-31651 is a medium-severity vulnerability in Linux kernel, published on 24 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

mmc: vub300: fix NULL-deref on disconnect

Make sure to deregister the controller before dropping the reference to the driver data on disconnect to avoid NULL-pointer dereferences or use-after-free.

Weakness: CWE-476

Which versions are affected by CVE-2026-31651?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31651?

Apply the vendor's patch.

Is CVE-2026-31651 being exploited?

There is no known exploitation of CVE-2026-31651 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-83705, BELL-CVE-2026-31651, DEBIAN-CVE-2026-31651, GHSA-gv6p-37ww-qhq7, ROOT-OS-DEBIAN-11-CVE-2026-31651, ROOT-OS-DEBIAN-12-CVE-2026-31651 and 3 more.