CVE-2026-46278
Received Received - Intake
Kernel NULL Pointer Dereference in PowerVR DRM Driver

Publication date: 2026-06-08

Last updated on: 2026-06-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Fix segfault when updating ftrace mask Fix invalid data access by passing right data for debugfs entry. [ 171.549793] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 171.559248] Mem abort info: [ 171.562173] ESR = 0x0000000096000044 [ 171.566227] EC = 0x25: DABT (current EL), IL = 32 bits [ 171.573108] SET = 0, FnV = 0 [ 171.576448] EA = 0, S1PTW = 0 [ 171.579745] FSC = 0x04: level 0 translation fault [ 171.584760] Data abort info: [ 171.588012] ISV = 0, ISS = 0x00000044, ISS2 = 0x00000000 [ 171.593734] CM = 0, WnR = 1, TnD = 0, TagAccess = 0 [ 171.598962] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [ 171.604471] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000083837000 [ 171.611358] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [ 171.618500] Internal error: Oops: 0000000096000044 [#1] SMP [ 171.624222] Modules linked in: powervr drm_shmem_helper drm_gpuvm... [ 171.656580] CPU: 0 UID: 0 PID: 549 Comm: bash Not tainted 7.0.0-rc2-g730b257ba723-dirty #13 PREEMPT [ 171.665773] Hardware name: BeagleBoard.org BeaglePlay (DT) [ 171.671296] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 171.678306] pc : pvr_fw_trace_mask_set+0x78/0x154 [powervr] [ 171.683959] lr : pvr_fw_trace_mask_set+0x4c/0x154 [powervr] [ 171.689593] sp : ffff8000835ebb90 [ 171.692929] x29: ffff8000835ebc00 x28: ffff000005c60f80 x27: 0000000000000000 [ 171.700130] x26: 0000000000000000 x25: ffff00000504af28 x24: 0000000000000000 [ 171.707324] x23: ffff00000504af50 x22: 0000000000000203 x21: 0000000000000000 [ 171.714518] x20: ffff000005c44a80 x19: ffff000005c457b8 x18: 0000000000000000 [ 171.721715] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaaae8887580 [ 171.728908] x14: 0000000000000000 x13: 0000000000000000 x12: ffff8000835ebc30 [ 171.736095] x11: ffff00000504af2a x10: ffff00008504af29 x9 : 0fffffffffffffff [ 171.743286] x8 : ffff8000835ebbf8 x7 : 0000000000000000 x6 : 000000000000002a [ 171.750479] x5 : ffff00000504af2e x4 : 0000000000000000 x3 : 0000000000000010 [ 171.757674] x2 : 0000000000000203 x1 : 0000000000000000 x0 : ffff8000835ebba0 [ 171.764871] Call trace: [ 171.767342] pvr_fw_trace_mask_set+0x78/0x154 [powervr] (P) [ 171.772984] simple_attr_write_xsigned.isra.0+0xe0/0x19c [ 171.778341] simple_attr_write+0x18/0x24 [ 171.782296] debugfs_attr_write+0x50/0x98 [ 171.786341] full_proxy_write+0x6c/0xa8 [ 171.790208] vfs_write+0xd4/0x350 [ 171.793561] ksys_write+0x70/0x108 [ 171.796995] __arm64_sys_write+0x1c/0x28 [ 171.800952] invoke_syscall+0x48/0x10c [ 171.804740] el0_svc_common.constprop.0+0x40/0xe0 [ 171.809487] do_el0_svc+0x1c/0x28 [ 171.812834] el0_svc+0x34/0x108 [ 171.816013] el0t_64_sync_handler+0xa0/0xe4 [ 171.820237] el0t_64_sync+0x198/0x19c [ 171.823939] Code: 32000262 b90ac293 1a931056 9134e293 (b9000036) [ 171.830073] ---[ end trace 0000000000000000 ]---
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Meta Information
Published
2026-06-08
Last Modified
2026-06-08
Generated
2026-06-09
AI Q&A
2026-06-08
EPSS Evaluated
N/A
NVD
CVE-2026-46278
EUVD
EUVD-2026-35143
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
imagination powervr *
Helpful Resources
Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel within the drm/imagination component related to the powervr driver. It causes a kernel NULL pointer dereference, leading to a segmentation fault (segfault) when updating the ftrace mask. The issue arises from invalid data access due to passing incorrect data to a debugfs entry, which results in the kernel attempting to access a null pointer and crashing.

Impact Analysis

This vulnerability can cause the Linux kernel to crash due to a NULL pointer dereference, resulting in a segmentation fault. Such crashes can lead to system instability, denial of service, or unexpected reboots, potentially disrupting normal operations on affected systems using the powervr driver.

Detection Guidance

This vulnerability manifests as a kernel NULL pointer dereference leading to a segmentation fault in the drm/imagination powervr driver when updating the ftrace mask.

Detection can be done by monitoring kernel logs for error messages similar to the following:

  • Look for kernel oops messages containing "Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000".
  • Check for call traces involving the function pvr_fw_trace_mask_set in the powervr module.

Suggested commands to detect this issue include:

  • Use `dmesg | grep -i 'Unable to handle kernel NULL pointer dereference'` to find relevant kernel oops messages.
  • Use `journalctl -k | grep -i 'pvr_fw_trace_mask_set'` to search systemd journal kernel logs for traces related to the vulnerable function.
  • Monitor system stability and crashes related to the powervr drm module.
Mitigation Strategies

Immediate mitigation steps include updating the Linux kernel to a version where this vulnerability is fixed.

Since the issue is caused by invalid data access when updating the ftrace mask in the powervr driver, avoid performing operations that update the ftrace mask or interact with the debugfs entries related to powervr until the patch is applied.

If updating the kernel is not immediately possible, consider disabling or unloading the powervr drm module to prevent triggering the vulnerability.

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