Vulnerability identifier: #VU91194

Vulnerability risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-46951

CWE-ID: CWE-191

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 integer underflow within the tpm_read_log_efi() function in drivers/char/tpm/eventlog/efi.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/2f12258b5224cfaa808c54fd29345f3c1cbfca76
http://git.kernel.org/stable/c/60a01ecc9f68067e4314a0b55148e39e5d58a51b
http://git.kernel.org/stable/c/3818b753277f5ca0c170bf5b98e0a5a225542fcb
http://git.kernel.org/stable/c/ac07c557ca12ec9276c0375517bac7ae5be4e50c
http://git.kernel.org/stable/c/48cff270b037022e37835d93361646205ca25101

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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.