[SECURITY] [DSA 5095-1] linux security update

Debian Security Advisory DSA-5095-1 [email protected]
https://www.debian.org/security/ Salvatore Bonaccorso
March 09, 2022 https://www.debian.org/security/faq

Package : linux
CVE ID : CVE-2020-36310 CVE-2022-0001 CVE-2022-0002 CVE-2022-0487
CVE-2022-0492 CVE-2022-0617 CVE-2022-25636
Debian Bug : 990279

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
leaks.

CVE-2020-36310

A flaw was discovered in the KVM implementation for AMD processors,
which could lead to an infinite loop.  A malicious VM guest could
exploit this to cause a denial of service.

CVE-2022-0001 (INTEL-SA-00598)

Researchers at VUSec discovered that the Branch History Buffer in
Intel processors can be exploited to create information side-
channels with speculative execution.  This issue is similar to
Spectre variant 2, but requires additional mitigations on some
processors.

This can be exploited to obtain sensitive information from a
different security context, such as from user-space to the kernel,
or from a KVM guest to the kernel.

CVE-2022-0002 (INTEL-SA-00598)

This is a similar issue to CVE-2022-0001, but covers exploitation
within a security context, such as from JIT-compiled code in a
sandbox to hosting code in the same process.

This is partly mitigated by disabling eBPF for unprivileged users
with the sysctl: kernel.unprivileged_bpf_disabled=2.  This is
already the default in Debian 11 "bullseye".

CVE-2022-0487

A use-after-free was discovered in the MOXART SD/MMC Host Controller
support driver. This flaw does not impact the Debian binary packages
as CONFIG_MMC_MOXART is not set.

CVE-2022-0492

Yiqi Sun and Kevin Wang reported that the cgroup-v1 subsystem does
not properly restrict access to the release-agent feature. A local
user can take advantage of this flaw for privilege escalation and
bypass of namespace isolation.

CVE-2022-0617

butt3rflyh4ck discovered a NULL pointer dereference in the UDF
filesystem. A local user that can mount a specially crafted UDF
image can use this flaw to crash the system.

CVE-2022-25636

Nick Gregory reported a heap out-of-bounds write flaw in the
netfilter subsystem. A user with the CAP_NET_ADMIN capability could
use this for denial of service or possibly for privilege escalation.

For the stable distribution (bullseye), these problems have been fixed
in version 5.10.103-1. This update additionally includes many more
bug fixes from stable updates 5.10.93-5.10.103 inclusive.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: [email protected]