#VU104453 Use-after-free in Linux kernel - CVE-2022-49623

Vulnerability identifier: #VU104453

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-2022-49623

CWE-ID: CWE-416

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 use-after-free error within the xive_irq_bitmap_add() and xive_irq_bitmap_remove_all() functions in arch/powerpc/sysdev/xive/spapr.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/10f2cd373e65bcd3be8f3cdc71c330c25763dfd8
https://git.kernel.org/stable/c/19fc5bb93c6bbdce8292b4d7eed04e2fa118d2fe
https://git.kernel.org/stable/c/99d1c36bddd93919072b5a51a89297bbb5ad6a6f

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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.