[ASA-202004-2] linux-hardened: privilege escalation
anthraxx at archlinux.org
Wed Apr 1 20:27:31 UTC 2020
Arch Linux Security Advisory ASA-202004-2
Date : 2020-04-01
CVE-ID : CVE-2020-8835
Package : linux-hardened
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-1120
The package linux-hardened before version 5.5.13.b-1 is vulnerable to
Upgrade to 5.5.13.b-1.
# pacman -Syu "linux-hardened>=5.5.13.b-1"
The problem has been fixed upstream in version 5.5.13.b.
By default linux-hardened is safe as it restricts BPF access to
privileged users. In case the kernel.unprivileged_bpf_disabled setting
has been explicitly changed, it can be restricted again:
# sysctl -w kernel.unprivileged_bpf_disabled=1
An out-of-bounds access flaw was found in the Linux kernel’s
implementation of the eBPF code verifier, where an incorrect register
bounds calculation while checking 32-bit instructions in an eBPF
program occurs. This flaw allows an unprivileged user or process to
execute eBPF programs to crash the kernel, resulting in a denial of
service or potentially gaining root privileges on the system.
An unprivileged local user or process can crash the kernel, resulting
in a denial of service, or potentially gain root privileges on the
system in case the default BPF access has been changed to allow
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 833 bytes
Desc: OpenPGP digital signature
More information about the arch-security