#VU91483 Race condition in Linux kernel - CVE-2023-52639

Vulnerability identifier: #VU91483

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-2023-52639

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 the gmap_shadow() function in arch/s390/mm/gmap.c, within the acquire_gmap_shadow() function in arch/s390/kvm/vsie.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/5df3b81a567eb565029563f26f374ae3803a1dfc
https://git.kernel.org/stable/c/f5572c0323cf8b4f1f0618178648a25b8fb8a380
https://git.kernel.org/stable/c/28bb27824f25f36e5f80229a358d66ee09244082
https://git.kernel.org/stable/c/fe752331d4b361d43cfd0b89534b4b2176057c32

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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.