NULL pointer dereference in Linux kernel drm bridge driver

1) NULL pointer dereference

EUVDB-ID: #VU90434

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-52856

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the lt8912_bridge_detach() function in drivers/gpu/drm/bridge/lontium-lt8912b.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.15 - 6.7 rc7

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.15:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15:rc7:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15.0:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.15.1:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/42071feab712ba2a139b8928f7e0f8d3a6fc719e
https://git.kernel.org/stable/c/7bf0cb8f40280a85034990dfe42be8ca8f80f37a
https://git.kernel.org/stable/c/fcd9895e365474709844eeb31cfe53d912c3596e
https://git.kernel.org/stable/c/b65e3249f3ca96e3c736af889461d80d675feab6
https://git.kernel.org/stable/c/44283993144a03af9df31934d6c32bbd42d1a347
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.139
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.63
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.12
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.2
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.7

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.