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openSUSE Leap 15.3: 2021:3941-1 Important: Kernel Privilege Escalation

opensuse
Calendar Grey December 6, 2021
Dist Opensuse Esm H88
Patches address multiple weaknesses in the Linux Kernel, improving overall security and requiring a system restart post-installation.
An update that solves four vulnerabilities, contains one feature and has 21 fixes is now available

Description

The SUSE Linux Enterprise 15 SP3 kernel was updated to receive various

security and bugfixes.

The following security bugs were fixed:

- Unprivileged BPF has been disabled by default to reduce attack surface

as too many security issues have happened in the past (jsc#SLE-22573)

You can reenable via systemctl setting

/proc/sys/kernel/unprivileged_bpf_disabled to 0.

(kernel.unprivileged_bpf_disabled = 0)

- 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-2021-31916: An out-of-bounds (OOB) memory write flaw was found in

list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module

in the Linux kernel A bound check failure allowed an attacker with

special user (CAP_SYS_ADMIN) privilege to...

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Topics%20covered

Topics Covered

security advisory information leak privilege escalation kernel attack surface openSUSE system availability

Patch

Patch Instructions:

To install this openSUSE 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:

- openSUSE Leap 15.3:

zypper in -t patch openSUSE-SLE-15.3-2021-3941=1

Package List

- openSUSE Leap 15.3 (aarch64 ppc64le s390x x86_64):

cluster-md-kmp-default-5.3.18-59.37.2

cluster-md-kmp-default-debuginfo-5.3.18-59.37.2

dlm-kmp-default-5.3.18-59.37.2

dlm-kmp-default-debuginfo-5.3.18-59.37.2

gfs2-kmp-default-5.3.18-59.37.2

gfs2-kmp-default-debuginfo-5.3.18-59.37.2

kernel-default-5.3.18-59.37.2

kernel-default-base-5.3.18-59.37.2.18.23.3

kernel-default-base-rebuild-5.3.18-59.37.2.18.23.3

kernel-default-debuginfo-5.3.18-59.37.2

kernel-default-debugsource-5.3.18-59.37.2

kernel-default-devel-5.3.18-59.37.2

kernel-default-devel-debuginfo-5.3.18-59.37.2

kernel-default-extra-5.3.18-59.37.2

kernel-default-extra-debuginfo-5.3.18-59.37.2

kernel-default-livepatch-5.3.18-59.37.2

kernel-default-livepatch-devel-5.3.18-59.37.2

kernel-default-optional-5.3.18-59.37.2

kernel-default-optional-debuginfo-5.3.18-59.37.2

kernel-obs-build-5.3.18-59.37.3

kernel-obs-build-debugsource-5.3.18-59.37.3

kernel-obs-qa-5.3.18-59.37.1

kernel-syms-5.3.18-59.37.1

kselftests-kmp-default-5.3.18-59.37.2

kselftests-kmp-default-deb...

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References

https://www.suse.com/security/cve/CVE-2021-0941.html

https://www.suse.com/security/cve/CVE-2021-20322.html

https://www.suse.com/security/cve/CVE-2021-31916.html

https://www.suse.com/security/cve/CVE-2021-34981.html

https://bugzilla.suse.com/1152489

https://bugzilla.suse.com/1169263

https://bugzilla.suse.com/1170269

https://bugzilla.suse.com/1184924

https://bugzilla.suse.com/1190523

https://bugzilla.suse.com/1190795

https://bugzilla.suse.com/1191790

https://bugzilla.suse.com/1191961

https://bugzilla.suse.com/1192045

https://bugzilla.suse.com/1192217

https://bugzilla.suse.com/1192273

https://bugzilla.suse.com/1192328

https://bugzilla.suse.com/1192375

https://bugzilla.suse.com/1192473

https://bugzilla.suse.com/1192718

https://bugzilla.suse.com/1192740

https://bugzilla.suse.com/1192745

https://bugzilla.suse.com/1192750

https://bugzilla.suse.com/1192753

https://bugzilla.suse.com/1192758

https://bugzilla.suse.com/1192781

https://bugzilla.suse.com/1192802

https://bugzilla.suse.com/1192896

https://bugzilla.suse.com/1192...

Read the Full Advisory

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: openSUSE-SU-2021:3941-1
Rating: important
Affected Products: openSUSE Leap 15.3 ble.

Topics%20covered

Topics Covered

security advisory information leak privilege escalation kernel attack surface openSUSE system availability

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