SUSE-SU-2021:4021-1: important: Security update for the Linux Kernel (Live Patch 25 for SLE 12 SP5)

[sle-updates at lists.suse.com]

   SUSE Security Update: Security update for the Linux Kernel (Live Patch 25 for SLE 12 SP5)
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Announcement ID:    SUSE-SU-2021:4021-1
Rating:             important
References:         #1191813 #1192042 #1192048 
Cross-References:   CVE-2021-0935 CVE-2021-0941 CVE-2021-20322
                   
CVSS scores:
                    CVE-2021-0935 (SUSE): 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
                    CVE-2021-0941 (SUSE): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
                    CVE-2021-20322 (SUSE): 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Products:
                    SUSE Linux Enterprise Live Patching 12-SP5
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   An update that fixes three vulnerabilities is now available.

Description:

   This update for the Linux Kernel 4.12.14-122_98 fixes several issues.

   The following security issues were fixed:

   - CVE-2021-0941: In bpf_skb_change_head of filter.c, there is a possible
     out of bounds read due to a use after free. This could lead to local
     escalation of privilege with System execution privileges needed. User
     interaction is not needed for exploitation (bnc#1192045).
   - CVE-2021-20322: Make the ipv4 and ipv6 ICMP exception caches less
     predictive to avoid information leaks about UDP ports in use.
     (bsc#1191790)
   - CVE-2021-0935: In ip6_xmit of ip6_output.c, there is a possible out of
     bounds write due to a use after free. This could lead to local
     escalation of privilege with System execution privileges needed. User
     interaction is not needed for exploitation. (bsc#1192032)


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 Live Patching 12-SP5:

      zypper in -t patch SUSE-SLE-Live-Patching-12-SP5-2021-4021=1



Package List:

   - SUSE Linux Enterprise Live Patching 12-SP5 (ppc64le s390x x86_64):

      kgraft-patch-4_12_14-122_98-default-2-2.1


References:

   https://www.suse.com/security/cve/CVE-2021-0935.html
   https://www.suse.com/security/cve/CVE-2021-0941.html
   https://www.suse.com/security/cve/CVE-2021-20322.html
   https://bugzilla.suse.com/1191813
   https://bugzilla.suse.com/1192042
   https://bugzilla.suse.com/1192048