#VU90356 Out-of-bounds read in Linux kernel - CVE-2021-46980

Vulnerability identifier: #VU90356

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46980

CWE-ID: CWE-125

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 perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds read error within the ucsi_unregister_altmodes(), ucsi_get_pdos() and ucsi_pwr_opmode_change() functions in drivers/usb/typec/ucsi/ucsi.c. A local user can perform a denial of service (DoS) attack.

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/e5366bea0277425e1868ba20eeb27c879d5a6e2d
https://git.kernel.org/stable/c/a453bfd7ef15fd9d524004d3ca7b05353a302911
https://git.kernel.org/stable/c/5e9c6f58b01e6fdfbc740390c01f542a35c97e57
https://git.kernel.org/stable/c/1f4642b72be79757f050924a9b9673b6a02034bc

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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.