CVE-2026-31753 auxdisplay: line-display: fix NULL dereference in linedisp_release

What is CVE-2026-31753?

CVE-2026-31753 is a medium-severity vulnerability in Linux kernel, published on 1 May 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:

auxdisplay: line-display: fix NULL dereference in linedisp_release

linedisp_release() currently retrieves the enclosing struct linedisp via to_linedisp(). That lookup depends on the attachment list, but the attachment may already have been removed before put_device() invokes the release callback. This can happen in linedisp_unregister(), and can also be reached from some linedisp_register() error paths.

In that case, to_linedisp() returns NULL and linedisp_release() dereferences it while freeing the display resources.

The struct device released here is the embedded linedisp->dev used by linedisp_register(), so retrieve the enclosing object directly with container_of() instead.

Weakness: CWE-476

Which versions are affected by CVE-2026-31753?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31753?

Apply the vendor's patch.

Is CVE-2026-31753 being exploited?

There is no known exploitation of CVE-2026-31753 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 DEBIAN-CVE-2026-31753, GHSA-gmmh-f7fw-32mm, UBUNTU-CVE-2026-31753.