Privilege escalation in Linux kernel VM_PFNMAP VMA



Published: 2022-09-20
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-39188
CWE-ID CWE-362
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Linux kernel
Operating systems & Components / Operating system

Vendor

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Race condition

EUVDB-ID: #VU67478

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2022-39188

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

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

before 5.19
CPE2.3 External links

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

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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