Vulnerability identifier: #VU66477

Vulnerability risk: Low

CVSSv3.1:

CVE-ID: CVE-2021-35039

CWE-ID:

Exploitation vector: Local

Exploit availability:

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor:

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper signature handling in the kernel/module.c in Linux kernel. If the kernel module is not signed, it still can be loaded into the system via init_module if module.sig_enforce=1 command-line argument is used. As a result, a local user can load unsigned and potentially malicious kernel modules.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://www.openwall.com/lists/oss-security/2021/07/06/3
http://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14
http://www.openwall.com/lists/oss-security/2021/07/06/3
http://security.netapp.com/advisory/ntap-20210813-0004/
http://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?