Cloudanix VulnDB

CVE-2026-93180

None

CVSS

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EPSS

0.2%

Published

Sep 17, 2026

CISA due date

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Cloudanix analysis

Schedule a fix SSVC: Track

A bug in a Linux graphics driver can make the computer crash when certain graphics memory operations occur.

Exploitation
Local Privilege
Attacker needs
Local User
Complexity
Moderate
Impact
Denial Of Service
Component
OS kernel
Class
Memory Corruption
Remediation
Patch
Effort
Low
Patch risk
Low

What it actually does

Null pointer dereference in the panthor GPU driver when splitting GPU mappings on partial unmap of an evicted buffer object, because huge-page handling logic was not bypassed for VMAs whose bo->backing.pages pointer had been cleared to NULL on eviction.

Why it matters to the business

Kernel panic and system crash on Linux hosts using the panthor driver, resulting in loss of availability and potential data loss for workloads that rely on the GPU.

How an attack unfolds

An attacker with local access issues DRM VM_BIND ioctls that evict a buffer object and then perform a partial unmap, causing the kernel to enter the huge-page split path and dereference the now-NULL pages pointer inside iova_mapped_as_huge_page.

How to fix it

Apply the upstream fix that adds an early return to skip huge-page logic when the BO is evicted; rebuild and boot the patched kernel.

How to confirm the fix worked

Confirm the fix commit is present in the running kernel tree and reproduce a partial unmap of an evicted BO without triggering the oops shown in the advisory.

Typical attack path

  1. Obtain a local shell on a system exposing the panthor DRM device
  2. Allocate and map a large buffer object via the panthor driver
  3. Trigger eviction of the buffer object
  4. Issue a partial unmap operation that forces GPU VA split handling
  5. Kernel dereferences NULL pointer and panics

How to detect it

Search kernel logs and dmesg for the exact Oops string referencing iova_mapped_as_huge_page and panthor_gpuva_sm_step_remap after any VM bind or unmap activity.

  • iova_mapped_as_huge_page+0x20/0x68 [panthor]
  • panthor_gpuva_sm_step_remap+0x39c/0x498 [panthor]
  • Unable to handle kernel paging request at virtual address 0000000000002000
  • panthor_ioctl_vm_bind
  • drm_gpuvm_sm_unmap

What your security team should do

  • Prioritize kernel update on all systems that load the panthor module
  • Restrict unprivileged access to /dev/dri/render* nodes until patched
  • Add kernel oops signatures to SIEM alerting for immediate detection

The record

In the Linux kernel, the following vulnerability has been resolved: drm/panthor: Fix NPD issue on partial unmap of an evicted BO This commit fixes the NULL pointer dereference issue that would have happened on the split of GPU mapping due to partial unmap of an evicted BO. There is a logic to handle the partial unmap of huge pages when the GPU mapping is split. That logic was not being completely skipped for the VMA of an evicted BO and that resulted in a NPD possibility for the 'bo->backing.pages' pointer, which is set to NULL when pages of a BO are released on eviction. Following dump was seen when a partial unmap was exercised for an evicted BO. Unable to handle kernel paging request at virtual address 0000000000002000 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000008842e8000 [0000000000002000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] SMP <snip> pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : iova_mapped_as_huge_page+0x20/0x68 [panthor] lr : panthor_gpuva_sm_step_remap+0x39c/0x498 [panthor] sp : ffff800086193920 x29: ffff800086193920 x28: ffff800086193a18 x27: ffff800086193b80 x26: 0000000000400000 x25: 0000000000810000 x24: 0000000000400000 x23: ffff000808af1800 x22: 0000000000a00000 x21: ffff800086193a00 x20: ffff000806fd3f00 x19: 0000000000410000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: ffff800083ce2d83 x14: 0000000000000000 x13: 3120646574636976 x12: 6520303030303138 x11: 2d30303030313420 x10: ffff8000836e6c80 x9 : ffff80007bfc889c x8 : 3fffffffffffefff x7 : ffff8000836e6c80 x6 : 0000000000000000 x5 : ffff00097ef19088 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000010000 x1 : 0000000000000400 x0 : 0000000000000000 Call trace: iova_mapped_as_huge_page+0x20/0x68 [panthor] (P) op_remap_cb.isra.0+0x70/0xb0 __drm_gpuvm_sm_unmap+0xf8/0x1c0 drm_gpuvm_sm_unmap+0x40/0x60 panthor_vm_exec_op+0xa0/0x168 [panthor] panthor_vm_bind_exec_sync_op+0x8c/0xb8 [panthor] panthor_ioctl_vm_bind+0xbc/0x170 [panthor] drm_ioctl_kernel+0xc0/0x140 drm_ioctl+0x20c/0x500 __arm64_sys_ioctl+0xb4/0x118 invoke_syscall+0x5c/0x120 el0_svc_common.constprop.0+0x48/0xf8 do_el0_svc+0x28/0x40 el0_svc+0x38/0x128 el0t_64_sync_handler+0xa0/0xe8 el0t_64_sync+0x198/0x1a0 Code: 8b030021 cb020021 f940b800 d34cfc21 (f8617801) ---[ end trace 0000000000000000 ]--- v2: Fix indentation

Affected packages

Ecosystem Package Introduced Fixed