Advisories ยป MGASA-2021-0348

Updated kernel-linus packages fix security vulnerabilities

Publication date: 12 Jul 2021
Type: security
Affected Mageia releases : 8
CVE: CVE-2020-26541 , CVE-2021-22543 , CVE-2021-35039


This kernel-linus update is based on upstream 5.10.48 and fixes at least the
following security issues:

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot
Forbidden Signature Database (aka dbx) protection mechanism. This affects
certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541).

An issue was discovered in Linux: KVM through Improper handling of VM_IO|
VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being
freed while still accessible by the VMM and guest. This allows users with
the ability to start and control a VM to read/write random pages of memory
and can result in local privilege escalation (CVE-2021-22543).

kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature
Verification. Without CONFIG_MODULE_SIG, verification that a kernel module
is signed, for loading via init_module, does not occur for a
module.sig_enforce=1 command-line argument (CVE-2021-35039).

For other upstream fixes, see the referenced changelogs.