#VU67478 Race condition in Linux kernel - CVE-2022-39188

Vulnerability identifier: #VU67478

Vulnerability 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-2022-39188

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: No

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

Vendor: Linux Foundation

Description

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

The vulnerability exists due to a race condition within include/asm-generic/tlb.h in the Linux kernel. A local user can exploit the race and escalate privileges on the system.

Note, this only occurs in situations with VM_PFNMAP VMAs.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.19

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External links
https://github.com/torvalds/linux/commit/b67fbebd4cf980aecbcc750e1462128bffe8ae15
https://lore.kernel.org/stable/CAG48ez3SEqOPcPCYGHVZv4iqEApujD5VtM3Re-tCKLDEFdEdbg@mail.gmail.com/
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b67fbebd4cf980aecbcc750e1462128bffe8ae15
https://bugs.chromium.org/p/project-zero/issues/detail?id=2329

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?