Debian Security Advisory DSA 5095-1

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Im Kernel von Debian wurden ca. 7 Sicherheitslücken gefunden.

Debian Security Advisory DSA-5095-1 Notes

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.

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/

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