Debian Security Advisory

DLA-3102-1 linux-5.10 -- LTS security update

Date Reported:

11 Sep 2022

Affected Packages:

Vulnerable:

Yes

Security database references:

In Mitre's CVE dictionary: CVE-2022-2585, CVE-2022-2586, CVE-2022-2588, CVE-2022-26373, CVE-2022-29900, CVE-2022-29901, CVE-2022-36879, CVE-2022-36946.

More information:

Linux 5.10 has been packaged for Debian 10 as linux-5.10. This provides a supported upgrade path for systems that currently use kernel packages from the "buster-backports" suite.

There is no need to upgrade systems using Linux 4.19, as that kernel version will also continue to be supported in the LTS period.

The "apt full-upgrade" command will not automatically install the updated kernel packages. You should explicitly install one of the following metapackages first, as appropriate for your system:

linux-image-5.10-686
linux-image-5.10-686-pae
linux-image-5.10-amd64
linux-image-5.10-arm64
linux-image-5.10-armmp
linux-image-5.10-armmp-lpae
linux-image-5.10-cloud-amd64
linux-image-5.10-cloud-arm64
linux-image-5.10-rt-686-pae
linux-image-5.10-rt-amd64
linux-image-5.10-rt-arm64
linux-image-5.10-rt-armmp

For example, if the command "uname -r" currently shows "5.10.0-0.deb10.16-amd64", you should install linux-image-5.10-amd64.

This backport does not include the following binary packages:

bpftool hyperv-daemons libcpupower-dev libcpupower1 linux-compiler-gcc-8-arm linux-compiler-gcc-8-x86 linux-cpupower linux-libc-dev usbip

Older versions of most of those are built from the linux source package in Debian 10.

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

CVE-2022-2585
A use-after-free flaw in the implementation of POSIX CPU timers may result in denial of service or in local privilege escalation.
CVE-2022-2586
A use-after-free in the Netfilter subsystem may result in local privilege escalation for a user with the CAP_NET_ADMIN capability in any user or network namespace.
CVE-2022-2588
Zhenpeng Lin discovered a use-after-free flaw in the cls_route filter implementation which may result in local privilege escalation for a user with the CAP_NET_ADMIN capability in any user or network namespace.
CVE-2022-26373
It was discovered that on certain processors with Intel's Enhanced Indirect Branch Restricted Speculation (eIBRS) capabilities there are exceptions to the documented properties in some situations, which may result in information disclosure.

Intel's explanation of the issue can be found at https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/post-barrier-return-stack-buffer-predictions.html
CVE-2022-29900
Johannes Wikner and Kaveh Razavi reported that for AMD/Hygon processors, mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions.

A list of affected AMD CPU types can be found at https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1037
CVE-2022-29901
Johannes Wikner and Kaveh Razavi reported that for Intel processors (Intel Core generation 6, 7 and 8), protections against speculative branch target injection attacks were insufficient in some circumstances, which may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions.

More information can be found at https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/return-stack-buffer-underflow.html
CVE-2022-36879
A flaw was discovered in xfrm_expand_policies in the xfrm subsystem which can cause a reference count to be dropped twice.
CVE-2022-36946
Domingo Dirutigliano and Nicola Guerrera reported a memory corruption flaw in the Netfilter subsystem which may result in denial of service.

For Debian 10 buster, these problems have been fixed in version 5.10.136-1~deb10u3. This update additionally includes many more bug fixes from stable updates 5.10.128-5.10.136 inclusive.

We recommend that you upgrade your linux-5.10 packages.

For the detailed security status of linux-5.10 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux-5.10

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