Use-after-free in Linux kernel staging mt7621-pinctrl driver

1) Use-after-free

EUVDB-ID: #VU104455

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-2022-49608

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

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 rt2880_pinmux_pins() function in drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c. A local user can escalate privileges on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.19 - 5.19 rc6

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:4.19:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux_foundation:linux_kernel:4.19.9:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/13596e6c9e541e90e5fc2c52b23f08b951370da9
https://git.kernel.org/stable/c/44016a85419ca0d4f1e4d0127b330f8e4e2a57d0
https://git.kernel.org/stable/c/5595d30c4dc27d939635c3188c68203b6ece1711
https://git.kernel.org/stable/c/5694b162f275fb9a9f89422701b2b963be11e496
https://git.kernel.org/stable/c/6194c021496addc11763d1ffa89ce5751889fe3c
https://git.kernel.org/stable/c/c3b821e8e406d5650e587b7ac624ac24e9b780a8
https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.254
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.134
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.58
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.15
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.208

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.