Vulnerability identifier: #VU51774

Vulnerability risk: Low

CVSSv3.1:

CVE-ID: CVE-2020-27170

CWE-ID: CWE-203

Exploitation vector: Local

Exploit availability: No

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

Vendor:

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists in kernel/bpf/verifier.c due to kernel performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations. A local user can run a specially crafted program to gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://www.openwall.com/lists/oss-security/2021/03/24/4
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f232326f6966cf2a1d1db7bc917a4ce5f9f55f76
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/
http://www.openwall.com/lists/oss-security/2021/03/19/2

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?