CVE-2025-38669

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-38669
In the Linux kernel, the following vulnerability has been resolved: Revert "drm/gem-shmem: Use dma_buf from GEM object instance" This reverts commit 1a148af06000e545e714fe3210af3d77ff903c11. The dma_buf field in struct drm_gem_object is not stable over the object instance's lifetime. The field becomes NULL when user space releases the final GEM handle on the buffer object. This resulted in a NULL-pointer deref. Workarounds in commit 5307dce878d4 ("drm/gem: Acquire references on GEM handles for framebuffers") and commit f6bfc9afc751 ("drm/framebuffer: Acquire internal references on GEM handles") only solved the problem partially. They especially don't work for buffer objects without a DRM framebuffer associated. Hence, this revert to going back to using .import_attach->dmabuf. v3: - cc stable

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed Patch
https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*
History

25 Nov 2025, 22:14

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed - () https://git.kernel.org/stable/c/291a77604858a8b47cf6640a12b76e97f99e00ed - Patch
References () https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7 - () https://git.kernel.org/stable/c/6d496e9569983a0d7a05be6661126d0702cf94f7 - Patch
First Time Linux
Linux linux Kernel
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:6.16:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.16:rc7:*:*:*:*:*:*
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Revertir "drm/gem-shmem: Usar dma_buf de la instancia del objeto GEM". Esto revierte el commit 1a148af06000e545e714fe3210af3d77ff903c11. El campo dma_buf en la estructura drm_gem_object no es estable durante la vida útil de la instancia del objeto. El campo se vuelve nulo cuando el espacio de usuario libera el identificador GEM final en el objeto de búfer. Esto resultó en una desreferencia de puntero nulo. Las soluciones alternativas en los commit 5307dce878d4 ("drm/gem: Adquirir referencias en identificadores GEM para framebuffers") y f6bfc9afc751 ("drm/framebuffer: Adquirir referencias internas en identificadores GEM") solo resolvieron el problema parcialmente. En particular, no funcionan con objetos de búfer sin un framebuffer DRM asociado. Por lo tanto, volvemos a utilizar .import_attach->dmabuf. v3: - cc estable
CWE CWE-476

22 Aug 2025, 16:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-08-22 16:15

Updated : 2025-11-25 22:14

NVD link : CVE-2025-38669

Mitre link : CVE-2025-38669

CVE.ORG link : CVE-2025-38669

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference