#VU106159 Use-after-free in Linux kernel - CVE-2023-52983

Vulnerability identifier: #VU106159

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-2023-52983

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 bfq_check_ioprio_change() function in block/bfq-iosched.c, within the __bfq_bic_change_cgroup() function in block/bfq-cgroup.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/511c922c5bf6c8a166bea826e702336bc2424140
https://git.kernel.org/stable/c/7f77f3dab5066a7c9da73d72d1eee895ff84a8d5
https://git.kernel.org/stable/c/b600de2d7d3a16f9007fad1bdae82a3951a26af2
https://git.kernel.org/stable/c/cb1876fc33af26d00efdd473311f1b664c77c44e

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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.