From: Ben Hutchings To: debian-security-announce@lists.debian.org Subject: [SECURITY] [DSA XXXX-1] linux security update ------------------------------------------------------------------------- Debian Security Advisory DSA-XXXX-1 security@debian.org https://www.debian.org/security/ Ben Hutchings March 08, 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: debian-security-announce@lists.debian.org