Linux Kernel up to 6.19.11 auxdisplay linedisp_release null pointer dereference

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.19.11 and classified as critical. Impacted is the function linedisp_release of the component auxdisplay. The manipulation leads to null pointer dereference. This vulnerability is traded as CVE-2026-31753. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.19.11. It has been rated as critical. This issue affects the function linedisp_release of the component auxdisplay. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-31753 since 03/09/2026. Technical details are known, but no exploit is available.

Upgrading to version 6.19.12 eliminates this vulnerability. Applying the patch 625fdac41cfc4ca9e1774a0d31d7985aec2c1d66/7f138de156b20d9f9da6f72f90b63c01941d97d3 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5
• 6.19.6
• 6.19.7
• 6.19.8
• 6.19.9
• 6.19.10
• 6.19.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

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