Linux Kernel up to 6.12.44/6.16.4/6.17-rc3 Virtual Address atomic_disable null pointer dereference

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Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.44/6.16.4/6.17-rc3. It has been rated as critical. This vulnerability affects the function atomic_disable of the component Virtual Address Handler. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2025-39807. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.12.44/6.16.4/6.17-rc3. Affected by this vulnerability is the function atomic_disable of the component Virtual Address Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Add error handling for old state CRTC in atomic_disable Introduce error handling to address an issue where, after a hotplug event, the cursor continues to update. This situation can lead to a kernel panic due to accessing the NULL `old_state->crtc`. E,g. Unable to handle kernel NULL pointer dereference at virtual address Call trace: mtk_crtc_plane_disable+0x24/0x140 mtk_plane_atomic_update+0x8c/0xa8 drm_atomic_helper_commit_planes+0x114/0x2c8 drm_atomic_helper_commit_tail_rpm+0x4c/0x158 commit_tail+0xa0/0x168 drm_atomic_helper_commit+0x110/0x120 drm_atomic_commit+0x8c/0xe0 drm_atomic_helper_update_plane+0xd4/0x128 __setplane_atomic+0xcc/0x110 drm_mode_cursor_common+0x250/0x440 drm_mode_cursor_ioctl+0x44/0x70 drm_ioctl+0x264/0x5d8 __arm64_sys_ioctl+0xd8/0x510 invoke_syscall+0x6c/0xe0 do_el0_svc+0x68/0xe8 el0_svc+0x34/0x60 el0t_64_sync_handler+0x1c/0xf8 el0t_64_sync+0x180/0x188 Adding NULL pointer checks to ensure stability by preventing operations on an invalid CRTC state.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-39807 since 04/16/2025. The exploitation appears to be difficult. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265301 (Linux Distros Unpatched Vulnerability : CVE-2025-39807), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.45, 6.16.5 or 6.17-rc4 eliminates this vulnerability. Applying the patch 7d5cc22efa44e0fe321ce195c71c3d7da211fbb2/9a94e9d8b50bcfe89693bc899a54d3866d86e973/0c6b24d70da21201ed009a2aca740d2dfddc7ab5 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265301), EUVD (EUVD-2025-29607) and CERT Bund (WID-SEC-2025-2077). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265301
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39807

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.45/6.16.5/6.17-rc4
Patch: 7d5cc22efa44e0fe321ce195c71c3d7da211fbb2/9a94e9d8b50bcfe89693bc899a54d3866d86e973/0c6b24d70da21201ed009a2aca740d2dfddc7ab5

Timelineinfo

04/16/2025 CVE reserved
09/16/2025 +153 days Advisory disclosed
09/16/2025 +0 days VulDB entry created
05/24/2026 +250 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39807 (🔒)
GCVE (CVE): GCVE-0-2025-39807
GCVE (VulDB): GCVE-100-324415
EUVD: 🔒
CERT Bund: WID-SEC-2025-2077 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 15:59
Updated: 05/24/2026 19:20
Changes: 09/16/2025 15:59 (59), 09/17/2025 14:52 (2), 10/21/2025 06:25 (7), 12/03/2025 05:26 (11), 12/27/2025 13:13 (1), 05/24/2026 19:20 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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