Linux Kernel up to 6.18.15/6.19.5 IRQ null pointer dereference

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.18.15/6.19.5 and classified as critical. The impacted element is an unknown function of the component IRQ Handler. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2026-43263. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.15/6.19.5. It has been rated as critical. This issue affects an unknown part of the component IRQ Handler. 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: media: chips-media: wave5: Fix Null reference while testing fluster When multi instances are created/destroyed, many interrupts happens and structures for decoder are removed. "struct vpu_instance" this structure is shared for all flow in the decoder, so if the structure is not protected by lock, Null dereference could happens sometimes. IRQ Handler was spilt to two phases and Lock was added as well.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-43263 since 05/01/2026. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch ea316b784fe6a61b29131c98cddb24e651b1dcbc/d12bcf183ec7da4305d848068d15f18044eaf62a/e66ff2b08e4ee1c4d3b84f24818e5bcc178cc3a4 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

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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