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Linux Kernel CVE-2025-68286

HIGH
2025-12-16 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Denial Of Service Linux Amd Red Hat Suse
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.7 MEDIUM

Local unprivileged trigger via a timing race (AV:L, PR:L, AC:H); a NULL deref only crashes the kernel, so C:N/I:N and A:H.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
4.4 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 30, 2026 - 07:14 vuln.today
CVE Published
Dec 16, 2025 - 16:16 cve.org
HIGH 7.8

DescriptionCVE.org

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)

AnalysisAI

Denial of service in the Linux kernel's AMD GPU display driver (amdgpu drm/amd/display) allows a local user to crash the system via a NULL pointer dereference in dc_stream_get_scanoutpos(). The flaw triggers during concurrent atomic modeset and cursor operations - reproducible with the IGT kms_cursor_legacy 'long-nonblocking-modeset-vs-cursor-atomic' test when both an eDP panel and a DP monitor are connected. No public exploit identified at time of analysis; EPSS is low (0.18%, 8th percentile) and this is not in CISA KEV.

Technical ContextAI

The vulnerability lives in the AMD Display Core (DC) subsystem of the amdgpu kernel driver, specifically the vblank timestamping path. When the kernel computes scanout position for vblank timing (dm_crtc_get_scanoutpos → amdgpu_display_get_crtc_scanoutpos → dc_stream_get_scanoutpos), the code dereferences a stream/timing structure that can be NULL during a non-blocking atomic modeset that races with a cursor atomic update. The root cause class is CWE-476 (NULL Pointer Dereference); the CVE input lists CWE as N/A, but the description ('Check NULL before accessing') and the crash signature (RAX=0, read at address 0x0 in dc_stream_get_scanoutpos+0x34) make the class unambiguous. The fix adds a NULL check before accessing the structure (cherry-picked from commit 621e55f1919640acab25383362b96e65f2baea3c).

Affected ProductsAI

The affected component is the Linux kernel amdgpu driver's AMD display core (drm/amd/display), impacting systems using AMD GPUs with the DC display path. No CPE strings were provided in the input, so exact kernel version ranges cannot be enumerated from CPE data; the fix is distributed across seven stable-tree commits (e.g., git.kernel.org/stable/c/621e55f… as the cherry-pick source and the seven referenced stable commits such as 09092269cb76, 109e9c92543f, 3ce62c189693, 62150f1e7ec7, 781f2f32e9c1, 9d1a65cbe3ec, and f7cf491cd5b5), indicating backports to multiple maintained stable kernel branches. Precise affected version boundaries should be confirmed against each distribution's kernel changelog.

RemediationAI

Upstream fix available (stable-tree commits); a released patched version is not independently confirmed from the input. Update to a kernel build that includes the referenced stable commits (cherry-picked from 621e55f1919640acab25383362b96e65f2baea3c) - apply your distribution's kernel update once it incorporates these commits, referencing git.kernel.org/stable/c/09092269cb762378ca8b56024746b1a136761e0d and the other six commit references for backport tracking. As there is no configuration-level workaround for a kernel race, compensating controls are limited to restricting local/console and unprivileged GPU-test access on affected AMD-GPU hosts and avoiding running display stress tools (e.g., IGT kms_cursor_legacy) on production systems; note this only reduces exposure to local actors and does not eliminate the underlying race.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:latest Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.95 Image SL-Micro Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.115 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.146 Affected
Container suse/sl-micro/6.0/toolbox:latest Affected

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CVE-2025-68286 vulnerability details – vuln.today
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