A linux security update has been released for Debian GNU/Linux 11 to address several vulnerabilities.
DSA 5095-1: linux security update
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Debian Security Advisory DSA-5095-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
March 09, 2022 https://www.debian.org/security/faq
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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/
