Use-after-free in Linux kernel video fbdev driver

1) Use-after-free

EUVDB-ID: #VU104423

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-49419

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the vesafb_remove() function in drivers/video/fbdev/vesafb.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.17 - 5.17.13

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:5.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc4:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc5:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc6:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc7:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc8:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:5.17:rc9:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/0fac5f8fb1bc2fc4f8714bf5e743c9cc3f547c63
https://git.kernel.org/stable/c/acde4003efc16480375543638484d8f13f2e99a3
https://git.kernel.org/stable/c/d260cad015945d1f4bb9b028a096f648506106a2
https://git.kernel.org/stable/c/f605f5558ecc175ec70016a3c15f007cb6386531
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.14

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.