Advisories ยป MGASA-2023-0243

Updated kernel-linus packages fix security vulnerabilities

Publication date: 26 Jul 2023
Type: security
Affected Mageia releases : 8
CVE: CVE-2023-20593 , CVE-2023-31248 , CVE-2023-35001


This kernel-linus update is based on upstream 5.15.122 and fixes atleast
the following security issues:

Under specific microarchitectural circumstances, a register in "Zen 2"
CPUs may not be written to 0 correctly. This may cause data from another
process and/or thread to be stored in the YMM register, which may allow
an attacker to potentially access sensitive information (CVE-2023-20593,
also known as Zenbleed).

This update adds a kernel-side mitigation for this issue to protect users
until Amd gets their fixed microcode / AGESA updates out for all affected
CPUs. The fixed microcode for Amd EPYC gen2 is available in the
microcode-0.20230613-2.mga8.nonfree package. For other affected CPUs, see
the referenced url that has info about estimated microcode update
timelines for various CPUs.

Linux Kernel nftables Use-After-Free Local Privilege Escalation
Vulnerability; nft_chain_lookup_byid() failed to check whether a chain
was active and CAP_NET_ADMIN is in any user or network namespace 

Linux Kernel nftables Out-Of-Bounds Read/Write Vulnerability;
nft_byteorder poorly handled vm register contents when CAP_NET_ADMIN
is in any user or network namespace (CVE-2023-35001).

For other upstream fixes in this update, see the referenced changelogs.