CVE-2025-40023 drm/xe/vf: Don't expose sysfs attributes not applicable for VFs
Local attackers can trigger kernel errors by accessing unsupported sysfs attributes in the Intel Xe GPU driver for Virtual Functions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40023?
CVE-2025-40023 is a denial of service vulnerability in Linux, published on 24 Oct 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/xe/vf: Don't expose sysfs attributes not applicable for VFs
VFs can't read BMG_PCIE_CAP(0x138340) register nor access PCODE (already guarded by the info.skip_pcode flag) so we shouldn't expose attributes that require any of them to avoid errors like:
[] xe 0000:03:00.1: [drm] Tile0: GT0: VF is trying to read an \ inaccessible register 0x138340+0x0 [] RIP: 0010:xe_gt_sriov_vf_read32+0x6c2/0x9a0 [xe] [] Call Trace: [] xe_mmio_read32+0x110/0x280 [xe] [] auto_link_downgrade_capable_show+0x2e/0x70 [xe] [] dev_attr_show+0x1a/0x70 [] sysfs_kf_seq_show+0xaa/0x120 [] kernfs_seq_show+0x41/0x60
(cherry picked from commit a2d6223d224f333f705ed8495bf8bebfbc585c35)
Which versions are affected by CVE-2025-40023?
How do I fix CVE-2025-40023?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-40023 being exploited?
There is no known exploitation of CVE-2025-40023 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40023, DEBIAN-CVE-2025-40023, GHSA-m3f2-pghf-98q6, UBUNTU-CVE-2025-40023.