# Security update for the Linux Kernel

Announcement ID: SUSE-SU-2023:4358-1  
Rating: important  
References:

  * bsc#1212051
  * bsc#1214842
  * bsc#1215095
  * bsc#1215467
  * bsc#1215518
  * bsc#1215745
  * bsc#1215858
  * bsc#1215860
  * bsc#1215861
  * bsc#1216046

  
Cross-References:

  * CVE-2023-2163
  * CVE-2023-3111
  * CVE-2023-34324
  * CVE-2023-3777
  * CVE-2023-39189
  * CVE-2023-39192
  * CVE-2023-39193
  * CVE-2023-39194
  * CVE-2023-42754

  
CVSS scores:

  * CVE-2023-2163 ( SUSE ):  7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
  * CVE-2023-2163 ( NVD ):  10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
  * CVE-2023-3111 ( SUSE ):  6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3111 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-34324 ( SUSE ):  5.7 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-3777 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-3777 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-39189 ( SUSE ):  4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
  * CVE-2023-39189 ( NVD ):  5.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L
  * CVE-2023-39192 ( SUSE ):  6.0 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
  * CVE-2023-39192 ( NVD ):  6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L
  * CVE-2023-39193 ( SUSE ):  5.1 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L
  * CVE-2023-39193 ( NVD ):  6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
  * CVE-2023-39194 ( SUSE ):  3.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
  * CVE-2023-39194 ( NVD ):  3.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
  * CVE-2023-42754 ( SUSE ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-42754 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Enterprise Micro 5.1
  * SUSE Linux Enterprise Micro 5.2
  * SUSE Linux Enterprise Micro for Rancher 5.2

  
  
An update that solves nine vulnerabilities and has one security fix can now be
installed.

## Description:

The SUSE Linux Enterprise 15 SP3 RT kernel was updated to receive various
security and bugfixes.

The following security bugs were fixed:

  * CVE-2023-2163: Fixed an incorrect verifier pruning in BPF that could lead to
    unsafe code paths being incorrectly marked as safe, resulting in arbitrary
    read/write in kernel memory, lateral privilege escalation, and container
    escape. (bsc#1215518)
  * CVE-2023-3777: Fixed a use-after-free vulnerability in netfilter: nf_tables
    component can be exploited to achieve local privilege escalation.
    (bsc#1215095)
  * CVE-2023-34324: Fixed a possible deadlock in Linux kernel event handling.
    (bsc#1215745).
  * CVE-2023-39189: Fixed a flaw in the Netfilter subsystem that could allow a
    local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read,
    leading to a crash or information disclosure. (bsc#1216046)
  * CVE-2023-3111: Fixed a use-after-free vulnerability in prepare_to_relocate
    in fs/btrfs/relocation.c (bsc#1212051).
  * CVE-2023-39194: Fixed an out of bounds read in the XFRM subsystem
    (bsc#1215861).
  * CVE-2023-39193: Fixed an out of bounds read in the xtables subsystem
    (bsc#1215860).
  * CVE-2023-39192: Fixed an out of bounds read in the netfilter (bsc#1215858).
  * CVE-2023-42754: Fixed a NULL pointer dereference in the IPv4 stack that
    could lead to denial of service (bsc#1215467).

The following non-security bugs were fixed:

  * nvme-fc: Prevent null pointer dereference in nvme_fc_io_getuuid()
    (bsc#1214842).

## Special Instructions and Notes:

  * Please reboot the system after installing this update.

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Micro 5.1  
    zypper in -t patch SUSE-SUSE-MicroOS-5.1-2023-4358=1

  * SUSE Linux Enterprise Micro 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2023-4358=1

  * SUSE Linux Enterprise Micro for Rancher 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2023-4358=1

## Package List:

  * SUSE Linux Enterprise Micro 5.1 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.149.1
  * SUSE Linux Enterprise Micro 5.1 (x86_64)
    * kernel-rt-debuginfo-5.3.18-150300.149.1
    * kernel-rt-debugsource-5.3.18-150300.149.1
  * SUSE Linux Enterprise Micro 5.2 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.149.1
  * SUSE Linux Enterprise Micro 5.2 (x86_64)
    * kernel-rt-debuginfo-5.3.18-150300.149.1
    * kernel-rt-debugsource-5.3.18-150300.149.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.149.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (x86_64)
    * kernel-rt-debuginfo-5.3.18-150300.149.1
    * kernel-rt-debugsource-5.3.18-150300.149.1

## References:

  * https://www.suse.com/security/cve/CVE-2023-2163.html
  * https://www.suse.com/security/cve/CVE-2023-3111.html
  * https://www.suse.com/security/cve/CVE-2023-34324.html
  * https://www.suse.com/security/cve/CVE-2023-3777.html
  * https://www.suse.com/security/cve/CVE-2023-39189.html
  * https://www.suse.com/security/cve/CVE-2023-39192.html
  * https://www.suse.com/security/cve/CVE-2023-39193.html
  * https://www.suse.com/security/cve/CVE-2023-39194.html
  * https://www.suse.com/security/cve/CVE-2023-42754.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1212051
  * https://bugzilla.suse.com/show_bug.cgi?id=1214842
  * https://bugzilla.suse.com/show_bug.cgi?id=1215095
  * https://bugzilla.suse.com/show_bug.cgi?id=1215467
  * https://bugzilla.suse.com/show_bug.cgi?id=1215518
  * https://bugzilla.suse.com/show_bug.cgi?id=1215745
  * https://bugzilla.suse.com/show_bug.cgi?id=1215858
  * https://bugzilla.suse.com/show_bug.cgi?id=1215860
  * https://bugzilla.suse.com/show_bug.cgi?id=1215861
  * https://bugzilla.suse.com/show_bug.cgi?id=1216046