Use-after-free in Linux kernel lz4

1) Use-after-free

EUVDB-ID: #VU104476

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-2022-49078

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 LZ4_decompress_generic() function in lib/lz4/lz4_decompress.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/467d5e200ab4486b744fe1776154a43d1aa22d4b
https://git.kernel.org/stable/c/6adc01a7aa37445dafe8846faa0610a86029b253
https://git.kernel.org/stable/c/73953dfa9d50e5c9fe98ee13fd1d3427aa12a0a3
https://git.kernel.org/stable/c/9fb8bc6cfc58773ce95414e11c9ccc8fc6ac4927
https://git.kernel.org/stable/c/e64dbe97c05c769525cbca099ddbd22485630235
https://git.kernel.org/stable/c/eafc0a02391b7b36617b36c97c4b5d6832cf5e24

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.