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OpenAdvisories

Description

In the Linux kernel before 4.20.14, expand_downwards in mm/mmap.c lacks a check for the mmap minimum address, which makes it easier for attackers to exploit kernel NULL pointer dereferences on non-SMAP platforms. This is related to a capability check for the wrong task.

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 linux 4.19.28-1 —
Debian 13 linux 4.19.28-1 —
Debian 12 linux 4.19.28-1 —
Debian 8 linux 3.16.64-1 DLA-1731-1
Debian 8 linux-4.9 4.9.168-1~deb8u1 DLA-1771-1
ReleasePackageFixed inAdvisory
Ubuntu 24.04 LTS linux-raspi-realtime No fix yet —
Ubuntu 22.04 LTS linux-riscv +2 No fix yet —
Ubuntu 20.04 LTS linux-gke +3 No fix yet —
Ubuntu 18.04 LTS linux 4.15.0-47.50 USN-3931-1
Ubuntu 18.04 LTS linux-aws 4.15.0-1035.37 USN-3931-1
Ubuntu 18.04 LTS linux-azure 4.18.0-1014.14~18.04.1 USN-3930-2
Ubuntu 18.04 LTS linux-gcp 4.15.0-1029.31 USN-3931-1
Ubuntu 18.04 LTS linux-gcp-edge 4.18.0-1008.9~18.04.1 —
Ubuntu 18.04 LTS linux-hwe 4.18.0-17.18~18.04.1 USN-3930-2
Ubuntu 18.04 LTS linux-kvm 4.15.0-1031.31 USN-3931-1
Ubuntu 18.04 LTS linux-oem 4.15.0-1035.40 USN-3931-1
Ubuntu 18.04 LTS linux-oracle 4.15.0-1010.12 USN-3931-1
Ubuntu 18.04 LTS linux-raspi2 4.15.0-1033.35 USN-3931-1
Ubuntu 18.04 LTS linux-snapdragon 4.15.0-1053.57 —
Ubuntu 16.04 LTS linux 4.4.0-145.171 USN-3932-1
Ubuntu 16.04 LTS linux-aws 4.4.0-1079.89 USN-3932-1
Ubuntu 16.04 LTS linux-aws-hwe 4.15.0-1035.37~16.04.1 USN-3931-2
Ubuntu 16.04 LTS linux-azure 4.15.0-1041.45 USN-3931-2
Ubuntu 16.04 LTS linux-gcp 4.15.0-1029.31~16.04.1 USN-3931-2
Ubuntu 16.04 LTS linux-hwe 4.15.0-47.50~16.04.1 USN-3931-2
Ubuntu 16.04 LTS linux-kvm 4.4.0-1043.49 USN-3932-1
Ubuntu 16.04 LTS linux-oracle 4.15.0-1010.12~16.04.1 USN-3931-2
Ubuntu 16.04 LTS linux-raspi2 4.4.0-1106.114 USN-3932-1
Ubuntu 16.04 LTS linux-snapdragon 4.4.0-1110.115 USN-3932-1
Show 2 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 14.04 LTS linux 3.13.0-168.218 USN-3933-1
Ubuntu 14.04 LTS linux-aws 4.4.0-1040.43 USN-3932-2
Ubuntu 14.04 LTS linux-azure 4.15.0-1041.45~14.04.1 USN-3931-2
Ubuntu 14.04 LTS linux-lts-xenial 4.4.0-144.170~14.04.1 USN-3932-2
Ubuntu Pro FIPS-updates 16.04 LTS linux-fips 4.4.0-1008.10 —
ReleasePackageFixed inAdvisory
RHEL 8 kernel-rt +12 4.18.0-80.4.2.rt9.152.el8_0 RHSA-2019:1480
RHEL 8 perf +26 4.18.0-80.4.2.el8_0 RHSA-2019:1479
RHEL 7 perf +14 4.14.0-115.7.1.el7a RHSA-2019:0831
ReleasePackageFixed inAdvisory
SLES 15 kernel-azure +2 4.12.14-5.24.1 SUSE-SU-2019:0785-1
SLES 15 kernel-default +3 4.12.14-150.14.2 SUSE-SU-2019:0784-1
SLES 15 kernel-docs +2 4.12.14-150.14.1 SUSE-SU-2019:0784-1
SLES 12 SP4 kernel-azure +2 4.12.14-6.9.1 SUSE-SU-2019:0767-1
SLES 12 SP4 kernel-docs +4 4.12.14-95.13.1 SUSE-SU-2019:0765-1
SLES 12 SP3 kernel-azure +2 4.4.176-4.25.1 SUSE-SU-2019:0901-1
SLES 12 SP3 kernel-docs +4 4.4.176-94.88.1 SUSE-SU-2019:0801-1
SLES 12 SP2 kernel-syms +2 4.4.121-92.104.1 SUSE-SU-2019:0828-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_20 11-2.1 SUSE-SU-2019:0683-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_21 +1 10-2.1 SUSE-SU-2019:0683-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_23 7-2.1 SUSE-SU-2019:0683-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_24 6-2.1 SUSE-SU-2019:0709-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_25 5-2.1 SUSE-SU-2019:0722-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_26 4-2.1 SUSE-SU-2019:0709-1
SLES 12 SP2 kgraft-patch-SLE12-SP2_Update_28 1-3.3.1 SUSE-SU-2019:0828-1
SLES 12 SP1 kernel-xen +3 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_26 12-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_27 10-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_28 +1 9-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_30 8-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_31 +1 6-2.1 SUSE-SU-2019:0672-1
SLES 12 SP1 kgraft-patch-SLE12-SP1_Update_33 1-2.3.1 SUSE-SU-2019:1289-1
SLES 12 SP1 lttng-modules 2.7.0-4.4.1 SUSE-SU-2019:1289-1
Show 11 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES 12 kernel-ec2 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES 12 kgraft-patch-SLE12_Update_33 12-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_34 10-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_35 +1 9-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_37 8-2.1 SUSE-SU-2019:0645-1
SLES 12 kgraft-patch-SLE12_Update_38 6-2.1 SUSE-SU-2019:0645-1
SLES 11 SP4 kernel-ec2 +8 3.0.101-108.90.1 SUSE-SU-2019:14051-1
SLES for SAP 12 SP4 kernel-azure +2 4.12.14-6.9.1 SUSE-SU-2019:0767-1
SLES for SAP 12 SP4 kernel-syms +2 4.12.14-95.13.1 SUSE-SU-2019:0765-1
SLES for SAP 12 SP3 kernel-azure +2 4.4.176-4.25.1 SUSE-SU-2019:0901-1
SLES for SAP 12 SP3 kernel-syms +2 4.4.176-94.88.1 SUSE-SU-2019:0801-1
SLES for SAP 12 SP2 kernel-syms +2 4.4.121-92.104.1 SUSE-SU-2019:0828-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_20 11-2.1 SUSE-SU-2019:0683-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_21 +1 10-2.1 SUSE-SU-2019:0683-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_23 7-2.1 SUSE-SU-2019:0683-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_24 6-2.1 SUSE-SU-2019:0709-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_25 5-2.1 SUSE-SU-2019:0722-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_26 4-2.1 SUSE-SU-2019:0709-1
SLES for SAP 12 SP2 kgraft-patch-SLE12-SP2_Update_28 1-3.3.1 SUSE-SU-2019:0828-1
SLES for SAP 12 SP1 kernel-xen +3 3.12.74-60.64.110.1 SUSE-SU-2019:1289-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_26 12-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_27 10-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_28 +1 9-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_30 8-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_31 +1 6-2.1 SUSE-SU-2019:0672-1
SLES for SAP 12 SP1 kgraft-patch-SLE12-SP1_Update_33 1-2.3.1 SUSE-SU-2019:1289-1
SLES for SAP 12 SP1 lttng-modules 2.7.0-4.4.1 SUSE-SU-2019:1289-1
SLE Live Patching 15 kernel-default 4.12.14-150.14.2 SUSE-SU-2019:0784-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_0 9-25.2 SUSE-SU-2019:0740-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_1 +1 8-2.1 SUSE-SU-2019:0745-1, SUSE-SU-2019:0740-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_3 6-2.1 SUSE-SU-2019:0745-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_4 +1 5-2.1 SUSE-SU-2019:0745-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_6 4-2.1 SUSE-SU-2019:0745-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_7 3-2.1 SUSE-SU-2019:0845-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_8 2-2.1 SUSE-SU-2019:0845-1
SLE Live Patching 15 kernel-livepatch-SLE15_Update_9 1-1.9.3 SUSE-SU-2019:0784-1
SLE Live Patching 12 SP4 kgraft-patch-SLE12-SP4_Update_0 4-2.10.2 SUSE-SU-2019:0726-1
SLE Live Patching 12 SP4 kgraft-patch-SLE12-SP4_Update_1 3-2.1 SUSE-SU-2019:0726-1
SLE Live Patching 12 SP4 kgraft-patch-SLE12-SP4_Update_2 2-2.1 SUSE-SU-2019:0726-1
SLE Live Patching 12 SP4 kgraft-patch-SLE12-SP4_Update_3 1-6.7.1 SUSE-SU-2019:0765-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_10 +1 11-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_12 +1 9-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_14 +1 7-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_16 +3 5-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_20 4-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_21 +1 3-2.1 SUSE-SU-2019:0754-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_23 2-2.1 SUSE-SU-2019:0761-1
SLE Live Patching 12 SP3 kgraft-patch-SLE12-SP3_Update_24 1-4.9.1 SUSE-SU-2019:0801-1
SUSE OpenStack Cloud 7 kernel-syms +2 4.4.121-92.104.1 SUSE-SU-2019:0828-1
SUSE OpenStack Cloud 7 kgraft-patch-SLE12-SP2_Update_28 1-3.3.1 SUSE-SU-2019:0828-1
SUSE Enterprise Storage 4 kernel-syms +2 4.4.121-92.104.1 SUSE-SU-2019:0828-1
SUSE Enterprise Storage 4 kgraft-patch-SLE12-SP2_Update_28 1-3.3.1 SUSE-SU-2019:0828-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.0 kernel-docs +8 4.12.14-lp150.12.58.1 openSUSE-SU-2019:1193-1

Amazon Linux

ReleasePackageFixed inAdvisory
Amazon Linux 2 perf +8 4.14.106-97.85.amzn2 ALAS2-2019-1179

Oracle Linux

ReleasePackageFixed inAdvisory
Oracle Linux 8 perf +19 4.18.0-80.4.2.el8_0 ELSA-2019-1479
Oracle Linux 7 kernel-uek +5 4.1.12-124.66.3.el7uek ELSA-2022-9761, ELSA-2019-4612
Oracle Linux 7 perf +5 4.14.35-1844.4.5.el7uek ELSA-2019-4612

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Metasploit 1 module

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 36

References