PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-46278 Linux CVE debrief

A vulnerability was discovered in the Linux kernel, specifically in the drm/imagination component. The issue occurs when updating the ftrace mask, leading to a segmentation fault due to invalid data access. The problem arises from passing incorrect data to a debugfs entry. This vulnerability can be triggered by writing to a debugfs attribute, which causes the kernel to attempt to access a null pointer, resulting in a crash.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-06-08
Advisory published
2026-06-08
Advisory updated
2026-06-08

Who should care

Linux kernel developers and users who rely on the drm/imagination component, particularly those using the powervr driver, should be aware of this vulnerability. This issue may affect systems that utilize this driver for graphics processing.

Technical summary

The vulnerability is caused by a null pointer dereference in the pvr_fw_trace_mask_set function of the powervr driver. When an attacker writes to a specific debugfs attribute, the function attempts to access a null pointer, leading to a segmentation fault. The issue is due to incorrect data being passed to the debugfs entry.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patches provided in the kernel.org references to fix the vulnerability.
  • Restrict access to debugfs attributes to prevent unauthorized writes.
  • Monitor kernel updates for a patched version of the Linux kernel.

Evidence notes

The vulnerability was discovered and resolved by passing the correct data to the debugfs entry. The fix involves modifying the pvr_fw_trace_mask_set function to handle data correctly.

Official resources

CVE-2026-46278 was published on 2026-06-08T17:16:45.390Z.