QwikSec

Security Database

CVE

CWE

Training

CVE-2020-27171

Published: Mar 20, 2021

Modified: Aug 4, 2024

PUBLISHED

Description

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8

x_refsource_MISC

https://www.openwall.com/lists/oss-security/2021/03/19/3

x_refsource_MISC

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch/?id=10d2bb2e6b1d8c4576c56a748f697dbeb8388899

x_refsource_MISC

FEDORA-2021-f0181b8085

vendor-advisory

x_refsource_FEDORA

FEDORA-2021-e49da8a226

vendor-advisory

x_refsource_FEDORA

[oss-security] 20210324 Re: [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memory

mailing-list

x_refsource_MLIST

FEDORA-2021-9503fffad9

vendor-advisory

x_refsource_FEDORA

[debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security update

mailing-list

x_refsource_MLIST

http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html

x_refsource_MISC

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.