PT-2021-2489 · Linux+6 · Linux Kernel+6
Piotr Krysiuk
·
Published
2021-03-17
·
Updated
2023-05-17
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CVE-2020-27170
CVSS v3.1
4.7
Medium
| Vector | AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
Name of the Vulnerable Software and Affected Versions:
Linux kernel versions prior to 5.11.8
Description:
The issue is related to the Linux kernel's kernel/bpf/verifier.c file, which performs undesirable out-of-bounds speculation on pointer arithmetic. This can lead to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. The issue affects pointer types that do not define a ptr limit.
Recommendations:
For Linux kernel versions prior to 5.11.8, update to version 5.11.8 or later to resolve the issue. As a temporary workaround, consider restricting access to sensitive information and limiting the use of pointer types that do not define a ptr limit to minimize the risk of exploitation.
Fix
Side Channel Attack
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Centos
Linuxmint
Linux Kernel
Red Hat
Suse
Ubuntu