drm/amd/display: Check NULL before accessing
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Check NULL before accessing [WHAT] IGT kms_cursor_legacy's long-nonblocking-modeset-vs-cursor-atomic fails with NULL pointer dereference. This can be reproduced with both an eDP panel and a DP monitors connected. BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 13 UID: 0 PID: 2960 Comm: kms_cursor_lega Not tainted 6.16.0-99-custom #8 PREEMPT(voluntary) Hardware name: AMD ........ RIP: 0010:dc_stream_get_scanoutpos+0x34/0x130 [amdgpu] Code: 57 4d 89 c7 41 56 49 89 ce 41 55 49 89 d5 41 54 49 89 fc 53 48 83 ec 18 48 8b 87 a0 64 00 00 48 89 75 d0 48 c7 c6 e0 41 30 c2 <48> 8b 38 48 8b 9f 68 06 00 00 e8 8d d7 fd ff 31 c0 48 81 c3 e0 02 RSP: 0018:ffffd0f3c2bd7608 EFLAGS: 00010292 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffd0f3c2bd7668 RDX: ffffd0f3c2bd7664 RSI: ffffffffc23041e0 RDI: ffff8b32494b8000 RBP: ffffd0f3c2bd7648 R08: ffffd0f3c2bd766c R09: ffffd0f3c2bd7760 R10: ffffd0f3c2bd7820 R11: 0000000000000000 R12: ffff8b32494b8000 R13: ffffd0f3c2bd7664 R14: ffffd0f3c2bd7668 R15: ffffd0f3c2bd766c FS: 000071f631b68700(0000) GS:ffff8b399f114000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 00000001b8105000 CR4: 0000000000f50ef0 PKRU: 55555554 Call Trace: <TASK> dm_crtc_get_scanoutpos+0xd7/0x180 [amdgpu] amdgpu_display_get_crtc_scanoutpos+0x86/0x1c0 [amdgpu] ? __pfx_amdgpu_crtc_get_scanout_position+0x10/0x10[amdgpu] amdgpu_crtc_get_scanout_position+0x27/0x50 [amdgpu] drm_crtc_vblank_helper_get_vblank_timestamp_internal+0xf7/0x400 drm_crtc_vblank_helper_get_vblank_timestamp+0x1c/0x30 drm_crtc_get_last_vbltimestamp+0x55/0x90 drm_crtc_next_vblank_start+0x45/0xa0 drm_atomic_helper_wait_for_fences+0x81/0x1f0 ... (cherry picked from commit 621e55f1919640acab25383362b96e65f2baea3c)
- Published
- Dec 16, 2025
- Updated
- Aug 5, 2026
- EPSS
- 0.2% · 4th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 4.15affected
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 781f2f32e9c19eb791b52af283c96f9a9677a7f2affected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 09092269cb762378ca8b56024746b1a136761e0daffected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 109e9c92543f3105e8e1efd2c5e6b92ef55d5743affected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 9d1a65cbe3ec5da3003c8434ac7a38dcdc958fd9affected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before f7cf491cd5b54b5a093bd3fdf76fa2860a7522bfaffected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 62150f1e7ec707da76ff353fb7db51fef9cd6557affected · git
- 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c and later · before 3ce62c189693e8ed7b3abe551802bbc67f3ace54affected · git
- before 4.15not affected · semver
- 5.10.247 and later · up to and including 5.10.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.159-1 | 6.1.159-1 |
| Debian:13 | linux | before 6.12.63-1 | 6.12.63-1 |
| Debian:14 | linux | before 6.17.11-1 | 6.17.11-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 09092269cb762378ca8b56024746b1a136761e0d | Vendor (CNA) |
| Linux Linux | 109e9c92543f3105e8e1efd2c5e6b92ef55d5743 | Vendor (CNA) |
| Linux Linux | 3ce62c189693e8ed7b3abe551802bbc67f3ace54 | Vendor (CNA) |
| Linux Linux | 62150f1e7ec707da76ff353fb7db51fef9cd6557 | Vendor (CNA) |
| Linux Linux | 781f2f32e9c19eb791b52af283c96f9a9677a7f2 | Vendor (CNA) |
| Linux Linux | 9d1a65cbe3ec5da3003c8434ac7a38dcdc958fd9 | Vendor (CNA) |
| Linux Linux | f7cf491cd5b54b5a093bd3fdf76fa2860a7522bf | Vendor (CNA) |
| debian:linux | 6.1.159-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
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CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/09092269cb762378ca8b56024746b1a136761e0d
- git.kernel.org/stable/c/109e9c92543f3105e8e1efd2c5e6b92ef55d5743
- git.kernel.org/stable/c/3ce62c189693e8ed7b3abe551802bbc67f3ace54
- git.kernel.org/stable/c/62150f1e7ec707da76ff353fb7db51fef9cd6557
- git.kernel.org/stable/c/781f2f32e9c19eb791b52af283c96f9a9677a7f2
- git.kernel.org/stable/c/9d1a65cbe3ec5da3003c8434ac7a38dcdc958fd9
- git.kernel.org/stable/c/f7cf491cd5b54b5a093bd3fdf76fa2860a7522bf
Vendor advisories and official records. Exploit/PoC links are deliberately left out.