CVE-2025-21843 drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

What is CVE-2025-21843?

CVE-2025-21843 is a medium-severity vulnerability in Linux kernel, published on 7 Mar 2025. 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:

drm/panthor: avoid garbage value in panthor_ioctl_dev_query()

'priorities_info' is uninitialized, and the uninitialized value is copied to user object when calling PANTHOR_UOBJ_SET(). Using memset to initialize 'priorities_info' to avoid this garbage value problem.

Weakness: CWE-908

Which versions are affected by CVE-2025-21843?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-21843?

Apply the vendor's patch.

Is CVE-2025-21843 being exploited?

There is no known exploitation of CVE-2025-21843 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 BELL-CVE-2025-21843, GHSA-r2jh-h942-fgww, UBUNTU-CVE-2025-21843.