#VU69297 Use-after-free in Linux kernel - CVE-2022-42703

Vulnerability identifier: #VU69297

Vulnerability risk: Low

CVSSv4.0: 5.4 [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:P/U:Clear]

CVE-ID: CVE-2022-42703

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to a use-after-free error within the mm/rmap.c in the Linux kernel, related to leaf anon_vma double reuse. A local user can trigger a use-after-free error and crash the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.19.7

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External links
https://bugs.chromium.org/p/project-zero/issues/detail?id=2351
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2555283eb40df89945557273121e9393ef9b542b
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.7
https://github.com/torvalds/linux/commit/2555283eb40df89945557273121e9393ef9b542b

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?