Security update for the Linux Kernel

SUSE Security Update: Security update for the Linux Kernel
Announcement ID: SUSE-SU-2021:1248-1
Rating: important
References: #1065729 #1113295 #1178181 #1181507 #1183405 #1183755 #1184120 #1184170 #1184391 #1184393 #1184397 #1184494 #1184511 #1184583
Cross-References:CVE-2020-25670 CVE-2020-25671 CVE-2020-25672 CVE-2020-25673 CVE-2020-36311 CVE-2021-20219 CVE-2021-29154 CVE-2021-30002 CVE-2021-3483
Affected Products:
  • SUSE Linux Enterprise Server 12-SP5

An update that solves 9 vulnerabilities and has 5 fixes is now available.


The SUSE Linux Enterprise 12 SP5 Azure kernel was updated to receive various security and bugfixes.
The following security bugs were fixed:

  • CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2020-25673: Fixed multiple bugs in NFC subsytem (bsc#1178181).
  • CVE-2020-36311: Fixed a denial of service (soft lockup) by triggering destruction of a large SEV VM (bsc#1184511).
  • CVE-2021-29154: Fixed incorrect computation of branch displacements, allowing arbitrary code execution (bsc#1184391).
  • CVE-2021-30002: Fixed a memory leak for large arguments in video_usercopy (bsc#1184120).
  • CVE-2021-3483: Fixed a use-after-free in nosy.c (bsc#1184393).
  • CVE-2021-20219: Fixed a denial of service in n_tty_receive_char_special (bsc#1184397).

The following non-security bugs were fixed:
  • cifs: do not send close in compound create+close requests (bsc#1181507).
  • net: sched: disable TCQ_F_NOLOCK for pfifo_fast (bsc#1183405)
  • powerpc/64s: Fix instruction encoding for lis in ppc_function_entry() (bsc#1065729).
  • powerpc/pmem: Include pmem prototypes (bsc#1113295 git-fixes).
  • powerpc/pseries/ras: Remove unused variable 'status' (bsc#1065729).
  • s390/pci: Fix s390_mmio_read/write with MIO (LTC#192079 bsc#1183755).
  • vsprintf: Do not have bprintf dereference pointers (bsc#1184494).
  • vsprintf: Do not preprocess non-dereferenced pointers for bprintf (%px and %pK) (bsc#1184494).
  • vsprintf: Fix off-by-one bug in bstr_printf() processing dereferenced pointers (bsc#1184494).
  • x86/mem_encrypt: Correct physical address calculation in __set_clr_pte_enc() (12sp5).
  • xen/events: fix setting irq affinity (bsc#1184583).

Special Instructions and Notes:

Please reboot the system after installing this update.

Patch Instructions:

To install this SUSE Security 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 Server 12-SP5:
    zypper in -t patch SUSE-SLE-SERVER-12-SP5-2021-1248=1

Package List:

  • SUSE Linux Enterprise Server 12-SP5 (x86_64):
    • kernel-azure-4.12.14-16.53.1
    • kernel-azure-base-4.12.14-16.53.1
    • kernel-azure-base-debuginfo-4.12.14-16.53.1
    • kernel-azure-debuginfo-4.12.14-16.53.1
    • kernel-azure-debugsource-4.12.14-16.53.1
    • kernel-azure-devel-4.12.14-16.53.1
    • kernel-syms-azure-4.12.14-16.53.1
  • SUSE Linux Enterprise Server 12-SP5 (noarch):
    • kernel-devel-azure-4.12.14-16.53.1
    • kernel-source-azure-4.12.14-16.53.1