#VU106169 Use-after-free in Linux kernel - CVE-2022-49740

Vulnerability identifier: #VU106169

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-2022-49740

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 brcmf_construct_chaninfo() and brcmf_enable_bw40_2g() functions in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.1, 6.1 rc1, 6.1 rc3, 6.1 rc7, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.1.5, 6.1.6, 6.1.7, 6.1.8, 6.1.9, 6.1.10

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External links
https://git.kernel.org/stable/c/4920ab131b2dbae7464b72bdcac465d070254209
https://git.kernel.org/stable/c/9cf5e99c1ae1a85286a76c9a970202750538394c
https://git.kernel.org/stable/c/b2e412879595821ff1b5545cbed5f108fba7f5b6
https://git.kernel.org/stable/c/e4991910f15013db72f6ec0db7038ea67a57052e
https://git.kernel.org/stable/c/f06de1bb6d61f0c18b0213bbc6298960037f9d42
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.11

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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.