#VU94229 Use-after-free in Linux kernel - CVE-2024-39508

Vulnerability identifier: #VU94229

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-2024-39508

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 WORKER_IDLE_TIMEOUT(), io_work_get_acct(), io_worker_exit(), io_wq_dec_running(), __io_worker_busy(), io_wq_worker(), io_wq_worker_running(), io_wq_worker_sleeping(), io_init_new_worker(), init_completion() and io_wq_work_match_item() functions in io_uring/io-wq.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/ab702c3483db9046bab9f40306f1a28b22dbbdc0
https://git.kernel.org/stable/c/1cbb0affb15470a9621267fe0a8568007553a4bf
https://git.kernel.org/stable/c/8a565304927fbd28c9f028c492b5c1714002cbab

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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.