#VU98892 Use-after-free in Linux kernel - CVE-2024-49854

Vulnerability identifier: #VU98892

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-2024-49854

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_prepare_request() and bfq_init_rq() functions in block/bfq-iosched.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/63a07379fdb6c72450cb05294461c6016b8b7726
https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd
https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f
https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583
https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe
https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf

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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.