PublicDateAtUSN: 2019-07-26 Candidate: CVE-2018-20856 PublicDate: 2019-07-26 05:15:00 UTC References: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20856 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24 https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24 https://ubuntu.com/security/notices/USN-4094-1 https://ubuntu.com/security/notices/USN-4116-1 https://ubuntu.com/security/notices/USN-4118-1 Description: An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled. Ubuntu-Description: It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. Notes: Bugs: Priority: medium Discovered-by: Assigned-to: CVSS: nvd: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H [7.8 HIGH] Patches_linux: break-fix: 7c94e1c157a227837b04f02f5edeff8301410ba2 54648cf1ec2d7f4b6a71767799c45676a138ca24 upstream_linux: released (4.19~rc1) precise/esm_linux: not-affected (3.0.0-12.20) trusty_linux: ignored (out of standard support) trusty/esm_linux: not-affected (3.11.0-12.19) xenial_linux: released (4.4.0-161.189) esm-infra/xenial_linux: released (4.4.0-161.189) bionic_linux: released (4.15.0-58.64) disco_linux: not-affected (4.18.0-10.11) devel_linux: not-affected (5.0.0-13.14) Patches_linux-lts-trusty: upstream_linux-lts-trusty: released (4.19~rc1) precise/esm_linux-lts-trusty: not-affected (3.13.0-24.46~precise1) trusty_linux-lts-trusty: DNE trusty/esm_linux-lts-trusty: DNE xenial_linux-lts-trusty: DNE bionic_linux-lts-trusty: DNE disco_linux-lts-trusty: DNE devel_linux-lts-trusty: DNE Patches_linux-goldfish: upstream_linux-goldfish: released (4.19~rc1) precise/esm_linux-goldfish: DNE trusty_linux-goldfish: ignored (out of standard support) trusty/esm_linux-goldfish: DNE xenial_linux-goldfish: ignored (end-of-life) bionic_linux-goldfish: DNE disco_linux-goldfish: DNE devel_linux-goldfish: DNE Patches_linux-grouper: upstream_linux-grouper: released (4.19~rc1) precise/esm_linux-grouper: DNE trusty_linux-grouper: ignored (out of standard support) trusty/esm_linux-grouper: DNE xenial_linux-grouper: DNE bionic_linux-grouper: DNE disco_linux-grouper: DNE devel_linux-grouper: DNE Patches_linux-maguro: upstream_linux-maguro: released (4.19~rc1) precise/esm_linux-maguro: DNE trusty_linux-maguro: ignored (out of standard support) trusty/esm_linux-maguro: DNE xenial_linux-maguro: DNE bionic_linux-maguro: DNE disco_linux-maguro: DNE devel_linux-maguro: DNE Patches_linux-mako: upstream_linux-mako: released (4.19~rc1) precise/esm_linux-mako: DNE trusty_linux-mako: ignored (out of standard support) trusty/esm_linux-mako: DNE xenial_linux-mako: ignored (abandoned) bionic_linux-mako: DNE disco_linux-mako: DNE devel_linux-mako: DNE Patches_linux-manta: upstream_linux-manta: released (4.19~rc1) precise/esm_linux-manta: DNE trusty_linux-manta: ignored (out of standard support) trusty/esm_linux-manta: DNE xenial_linux-manta: DNE bionic_linux-manta: DNE disco_linux-manta: DNE devel_linux-manta: DNE Patches_linux-flo: upstream_linux-flo: released (4.19~rc1) precise/esm_linux-flo: DNE trusty_linux-flo: ignored (out of standard support) trusty/esm_linux-flo: DNE xenial_linux-flo: ignored (abandoned) bionic_linux-flo: DNE disco_linux-flo: DNE devel_linux-flo: DNE Patches_linux-raspi2: upstream_linux-raspi2: released (4.19~rc1) precise/esm_linux-raspi2: DNE trusty_linux-raspi2: DNE trusty/esm_linux-raspi2: DNE xenial_linux-raspi2: released (4.4.0-1120.129) bionic_linux-raspi2: released (4.15.0-1043.46) disco_linux-raspi2: not-affected (4.18.0-1005.7) devel_linux-raspi2: not-affected (5.0.0-1006.6) Patches_linux-lts-utopic: upstream_linux-lts-utopic: released (4.19~rc1) precise/esm_linux-lts-utopic: DNE trusty_linux-lts-utopic: ignored (out of standard support) trusty/esm_linux-lts-utopic: DNE xenial_linux-lts-utopic: DNE bionic_linux-lts-utopic: DNE disco_linux-lts-utopic: DNE devel_linux-lts-utopic: DNE Patches_linux-lts-vivid: upstream_linux-lts-vivid: released (4.19~rc1) precise/esm_linux-lts-vivid: DNE trusty_linux-lts-vivid: ignored (out of standard support) trusty/esm_linux-lts-vivid: DNE xenial_linux-lts-vivid: DNE bionic_linux-lts-vivid: DNE disco_linux-lts-vivid: DNE devel_linux-lts-vivid: DNE Patches_linux-lts-wily: upstream_linux-lts-wily: released (4.19~rc1) precise/esm_linux-lts-wily: DNE trusty_linux-lts-wily: ignored (out of standard support) trusty/esm_linux-lts-wily: DNE xenial_linux-lts-wily: DNE bionic_linux-lts-wily: DNE disco_linux-lts-wily: DNE devel_linux-lts-wily: DNE Patches_linux-lts-xenial: upstream_linux-lts-xenial: released (4.19~rc1) precise/esm_linux-lts-xenial: DNE trusty_linux-lts-xenial: ignored (out of standard support) trusty/esm_linux-lts-xenial: ignored (was needed ESM criteria) xenial_linux-lts-xenial: DNE bionic_linux-lts-xenial: DNE disco_linux-lts-xenial: DNE devel_linux-lts-xenial: DNE Patches_linux-snapdragon: upstream_linux-snapdragon: released (4.19~rc1) precise/esm_linux-snapdragon: DNE trusty_linux-snapdragon: DNE trusty/esm_linux-snapdragon: DNE xenial_linux-snapdragon: released (4.4.0-1124.130) bionic_linux-snapdragon: released (4.15.0-1060.66) disco_linux-snapdragon: not-affected (5.0.0-1010.10) devel_linux-snapdragon: DNE Patches_linux-aws: upstream_linux-aws: released (4.19~rc1) precise/esm_linux-aws: DNE trusty_linux-aws: ignored (out of standard support) trusty/esm_linux-aws: ignored (was needed ESM criteria) xenial_linux-aws: released (4.4.0-1092.103) esm-infra/xenial_linux-aws: released (4.4.0-1092.103) bionic_linux-aws: released (4.15.0-1047.49) disco_linux-aws: not-affected (4.18.0-1002.3) devel_linux-aws: not-affected (5.0.0-1004.4) Patches_linux-hwe: upstream_linux-hwe: released (4.19~rc1) precise/esm_linux-hwe: DNE trusty_linux-hwe: DNE trusty/esm_linux-hwe: DNE xenial_linux-hwe: released (4.15.0-58.64~16.04.1) esm-infra/xenial_linux-hwe: released (4.15.0-58.64~16.04.1) bionic_linux-hwe: not-affected (4.18.0-13.14~18.04.1) disco_linux-hwe: DNE devel_linux-hwe: DNE Patches_linux-hwe-edge: upstream_linux-hwe-edge: released (4.19~rc1) precise/esm_linux-hwe-edge: DNE trusty_linux-hwe-edge: DNE trusty/esm_linux-hwe-edge: DNE xenial_linux-hwe-edge: released (4.15.0-58.64~16.04.1) esm-infra/xenial_linux-hwe-edge: released (4.15.0-58.64~16.04.1) bionic_linux-hwe-edge: not-affected (5.0.0-15.16~18.04.1) disco_linux-hwe-edge: DNE devel_linux-hwe-edge: DNE Patches_linux-gke: upstream_linux-gke: released (4.19~rc1) precise/esm_linux-gke: DNE trusty_linux-gke: DNE trusty/esm_linux-gke: DNE xenial_linux-gke: ignored (end-of-life) bionic_linux-gke: DNE disco_linux-gke: DNE devel_linux-gke: DNE Patches_linux-gke-4.15: upstream_linux-gke-4.15: released (4.19~rc1) precise/esm_linux-gke-4.15: DNE trusty_linux-gke-4.15: DNE trusty/esm_linux-gke-4.15: DNE xenial_linux-gke-4.15: DNE bionic_linux-gke-4.15: released (4.15.0-1040.42) disco_linux-gke-4.15: DNE devel_linux-gke-4.15: DNE Patches_linux-gke-5.0: upstream_linux-gke-5.0: released (4.19~rc1) precise/esm_linux-gke-5.0: DNE trusty_linux-gke-5.0: DNE trusty/esm_linux-gke-5.0: DNE xenial_linux-gke-5.0: DNE bionic_linux-gke-5.0: not-affected (5.0.0-1011.11~18.04.1) disco_linux-gke-5.0: DNE devel_linux-gke-5.0: DNE Patches_linux-azure: upstream_linux-azure: released (4.19~rc1) precise/esm_linux-azure: DNE trusty_linux-azure: ignored (out of standard support) trusty/esm_linux-azure: ignored (was needed ESM criteria) xenial_linux-azure: released (4.15.0-1055.60) esm-infra/xenial_linux-azure: released (4.15.0-1055.60) bionic_linux-azure: released (4.18.0-1011.11~18.04.1) disco_linux-azure: not-affected (4.18.0-1003.3) devel_linux-azure: not-affected (5.0.0-1004.4) Patches_linux-azure-edge: upstream_linux-azure-edge: released (4.19~rc1) precise/esm_linux-azure-edge: DNE trusty_linux-azure-edge: DNE trusty/esm_linux-azure-edge: DNE xenial_linux-azure-edge: released (4.15.0-1055.60) bionic_linux-azure-edge: released (4.18.0-1011.11~18.04.1) disco_linux-azure-edge: DNE devel_linux-azure-edge: DNE Patches_linux-gcp: upstream_linux-gcp: released (4.19~rc1) precise/esm_linux-gcp: DNE trusty_linux-gcp: DNE trusty/esm_linux-gcp: DNE xenial_linux-gcp: released (4.15.0-1040.42~16.04.1) esm-infra/xenial_linux-gcp: released (4.15.0-1040.42~16.04.1) bionic_linux-gcp: released (4.15.0-1040.42) disco_linux-gcp: not-affected (4.18.0-1002.3) devel_linux-gcp: not-affected (5.0.0-1004.4) Patches_linux-kvm: upstream_linux-kvm: released (4.19~rc1) precise/esm_linux-kvm: DNE trusty_linux-kvm: DNE trusty/esm_linux-kvm: DNE xenial_linux-kvm: released (4.4.0-1056.63) esm-infra/xenial_linux-kvm: released (4.4.0-1056.63) bionic_linux-kvm: released (4.15.0-1042.42) disco_linux-kvm: not-affected (4.18.0-1003.3) devel_linux-kvm: not-affected (5.0.0-1004.4) Patches_linux-euclid: upstream_linux-euclid: released (4.19~rc1) precise/esm_linux-euclid: DNE trusty_linux-euclid: DNE trusty/esm_linux-euclid: DNE xenial_linux-euclid: ignored (was needs-triage now end-of-life) bionic_linux-euclid: DNE disco_linux-euclid: DNE devel_linux-euclid: DNE Patches_linux-oem: upstream_linux-oem: released (4.19~rc1) precise/esm_linux-oem: DNE trusty_linux-oem: DNE trusty/esm_linux-oem: DNE xenial_linux-oem: ignored (was needs-triage now end-of-life) bionic_linux-oem: released (4.15.0-1050.57) disco_linux-oem: released (4.15.0-1050.57) devel_linux-oem: released (4.15.0-1050.57) Patches_linux-gcp-edge: upstream_linux-gcp-edge: released (4.19~rc1) precise/esm_linux-gcp-edge: DNE trusty_linux-gcp-edge: DNE trusty/esm_linux-gcp-edge: DNE xenial_linux-gcp-edge: DNE bionic_linux-gcp-edge: released (4.15.0-1040.42) disco_linux-gcp-edge: DNE devel_linux-gcp-edge: DNE Patches_linux-aws-hwe: upstream_linux-aws-hwe: released (4.19~rc1) precise/esm_linux-aws-hwe: DNE trusty_linux-aws-hwe: DNE trusty/esm_linux-aws-hwe: DNE xenial_linux-aws-hwe: released (4.15.0-1047.49~16.04.1) esm-infra/xenial_linux-aws-hwe: released (4.15.0-1047.49~16.04.1) bionic_linux-aws-hwe: DNE disco_linux-aws-hwe: DNE devel_linux-aws-hwe: DNE Patches_linux-oracle: upstream_linux-oracle: released (4.19~rc1) precise/esm_linux-oracle: DNE trusty_linux-oracle: DNE trusty/esm_linux-oracle: DNE xenial_linux-oracle: released (4.15.0-1021.23~16.04.1) esm-infra/xenial_linux-oracle: released (4.15.0-1021.23~16.04.1) bionic_linux-oracle: released (4.15.0-1021.23) disco_linux-oracle: released (5.0.0-1004.8) devel_linux-oracle: not-affected (5.3.0-1002.2)