# Security update for the Linux Kernel

Announcement ID: SUSE-SU-2023:4142-1  
Rating: important  
References:

  * bsc#1176588
  * bsc#1202845
  * bsc#1207270
  * bsc#1208995
  * bsc#1210169
  * bsc#1210643
  * bsc#1210658
  * bsc#1212703
  * bsc#1213812
  * bsc#1214233
  * bsc#1214351
  * bsc#1214380
  * bsc#1214386
  * bsc#1215115
  * bsc#1215117
  * bsc#1215150
  * bsc#1215221
  * bsc#1215275
  * bsc#1215299
  * bsc#1215322
  * bsc#1215356

  
Cross-References:

  * CVE-2020-36766
  * CVE-2023-1192
  * CVE-2023-1206
  * CVE-2023-1859
  * CVE-2023-2177
  * CVE-2023-4004
  * CVE-2023-40283
  * CVE-2023-42753
  * CVE-2023-4389
  * CVE-2023-4622
  * CVE-2023-4623
  * CVE-2023-4881
  * CVE-2023-4921

  
CVSS scores:

  * CVE-2020-36766 ( SUSE ):  2.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
  * CVE-2020-36766 ( NVD ):  3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
  * CVE-2023-1192 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-1206 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-1206 ( NVD ):  5.7 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-1859 ( SUSE ):  1.9 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
  * CVE-2023-1859 ( NVD ):  4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-2177 ( SUSE ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-2177 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2023-4004 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4004 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-40283 ( SUSE ):  5.7 CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
  * CVE-2023-40283 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-42753 ( NVD ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4389 ( SUSE ):  5.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
  * CVE-2023-4389 ( NVD ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4622 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4622 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4623 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4623 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4881 ( SUSE ):  6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
  * CVE-2023-4881 ( NVD ):  6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
  * CVE-2023-4921 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2023-4921 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 13 vulnerabilities and has eight security fixes 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-2023-4389: Fixed a reference counting issue in the Btrfs filesystem that
    could be exploited in order to leak internal kernel information or crash the
    system (bsc#1214351).
  * CVE-2023-42753: Fixed an array indexing vulnerability in the netfilter
    subsystem. This issue may have allowed a local user to crash the system or
    potentially escalate their privileges (bsc#1215150).
  * CVE-2023-1206: Fixed a hash collision flaw in the IPv6 connection lookup
    table. A user located in the local network or with a high bandwidth
    connection can increase the CPU usage of the server that accepts IPV6
    connections up to 95% (bsc#1212703).
  * CVE-2023-4921: Fixed a use-after-free vulnerability in the QFQ network
    scheduler which could be exploited to achieve local privilege escalatio
    (bsc#1215275).
  * CVE-2023-4004: Fixed improper element removal netfilter nft_set_pipapo
    (bsc#1213812).
  * CVE-2023-4622: Fixed a use-after-free vulnerability in the Unix domain
    sockets component which could be exploited to achieve local privilege
    escalation (bsc#1215117).
  * CVE-2023-4623: Fixed a use-after-free issue in the HFSC network scheduler
    which could be exploited to achieve local privilege escalation
    (bsc#1215115).
  * CVE-2020-36766: Fixed a potential information leak in in the CEC driver
    (bsc#1215299).
  * CVE-2023-1859: Fixed a use-after-free flaw in Xen transport for 9pfs which
    could be exploited to crash the system (bsc#1210169).
  * CVE-2023-2177: Fixed a null pointer dereference issue in the sctp network
    protocol which could allow a user to crash the system (bsc#1210643).
  * CVE-2023-4881: Fixed a out-of-bounds write flaw in the netfilter subsystem
    that could lead to potential information disclosure or a denial of service
    (bsc#1215221).
  * CVE-2023-40283: Fixed use-after-free in l2cap_sock_ready_cb (bsc#1214233).
  * CVE-2023-1192: Fixed use-after-free in cifs_demultiplex_thread()
    (bsc#1208995).

The following non-security bugs were fixed:

  * bnx2x: new flag for track HW resource allocation (bsc#1202845 bsc#1215322).
  * check-for-config-changes: ignore BUILTIN_RETURN_ADDRESS_STRIPS_PAC
    (bsc#1214380). gcc7 on SLE 15 does not support this while later gcc does.
  * locking/rwsem: Disable reader optimistic spinning (bnc#1176588).
  * mkspec: Allow unsupported KMPs (bsc#1214386)
  * scsi: qedf: Add synchronization between I/O completions and abort
    (bsc#1210658).
  * x86/pkeys: Revert a5eff7259790 ("x86/pkeys: Add PKRU value to init_fpstate")
    (bsc#1215356).
  * x86/srso: Do not probe microcode in a guest (git-fixes).
  * x86/srso: Fix SBPB enablement for spec_rstack_overflow=off (git-fixes).
  * x86/srso: Fix srso_show_state() side effect (git-fixes).
  * x86/srso: Set CPUID feature bits independently of bug or mitigation status
    (git-fixes).

## 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-5.1-2023-4142=1

  * SUSE Linux Enterprise Micro 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2023-4142=1

  * SUSE Linux Enterprise Micro for Rancher 5.2  
    zypper in -t patch SUSE-SUSE-MicroOS-5.2-2023-4142=1

## Package List:

  * SUSE Linux Enterprise Micro 5.1 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.144.1
  * SUSE Linux Enterprise Micro 5.1 (x86_64)
    * kernel-rt-debugsource-5.3.18-150300.144.1
    * kernel-rt-debuginfo-5.3.18-150300.144.1
  * SUSE Linux Enterprise Micro 5.2 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.144.1
  * SUSE Linux Enterprise Micro 5.2 (x86_64)
    * kernel-rt-debugsource-5.3.18-150300.144.1
    * kernel-rt-debuginfo-5.3.18-150300.144.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (nosrc x86_64)
    * kernel-rt-5.3.18-150300.144.1
  * SUSE Linux Enterprise Micro for Rancher 5.2 (x86_64)
    * kernel-rt-debugsource-5.3.18-150300.144.1
    * kernel-rt-debuginfo-5.3.18-150300.144.1

## References:

  * https://www.suse.com/security/cve/CVE-2020-36766.html
  * https://www.suse.com/security/cve/CVE-2023-1192.html
  * https://www.suse.com/security/cve/CVE-2023-1206.html
  * https://www.suse.com/security/cve/CVE-2023-1859.html
  * https://www.suse.com/security/cve/CVE-2023-2177.html
  * https://www.suse.com/security/cve/CVE-2023-4004.html
  * https://www.suse.com/security/cve/CVE-2023-40283.html
  * https://www.suse.com/security/cve/CVE-2023-42753.html
  * https://www.suse.com/security/cve/CVE-2023-4389.html
  * https://www.suse.com/security/cve/CVE-2023-4622.html
  * https://www.suse.com/security/cve/CVE-2023-4623.html
  * https://www.suse.com/security/cve/CVE-2023-4881.html
  * https://www.suse.com/security/cve/CVE-2023-4921.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1176588
  * https://bugzilla.suse.com/show_bug.cgi?id=1202845
  * https://bugzilla.suse.com/show_bug.cgi?id=1207270
  * https://bugzilla.suse.com/show_bug.cgi?id=1208995
  * https://bugzilla.suse.com/show_bug.cgi?id=1210169
  * https://bugzilla.suse.com/show_bug.cgi?id=1210643
  * https://bugzilla.suse.com/show_bug.cgi?id=1210658
  * https://bugzilla.suse.com/show_bug.cgi?id=1212703
  * https://bugzilla.suse.com/show_bug.cgi?id=1213812
  * https://bugzilla.suse.com/show_bug.cgi?id=1214233
  * https://bugzilla.suse.com/show_bug.cgi?id=1214351
  * https://bugzilla.suse.com/show_bug.cgi?id=1214380
  * https://bugzilla.suse.com/show_bug.cgi?id=1214386
  * https://bugzilla.suse.com/show_bug.cgi?id=1215115
  * https://bugzilla.suse.com/show_bug.cgi?id=1215117
  * https://bugzilla.suse.com/show_bug.cgi?id=1215150
  * https://bugzilla.suse.com/show_bug.cgi?id=1215221
  * https://bugzilla.suse.com/show_bug.cgi?id=1215275
  * https://bugzilla.suse.com/show_bug.cgi?id=1215299
  * https://bugzilla.suse.com/show_bug.cgi?id=1215322
  * https://bugzilla.suse.com/show_bug.cgi?id=1215356