PublicDateAtUSN: 2020-11-23 21:15:00 UTC
Candidate: CVE-2020-15436
PublicDate: 2020-11-23 21:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15436
 https://git.kernel.org/linus/2d3a8e2deddea6c89961c422ec0c5b851e648c14
 https://lkml.org/lkml/2020/6/7/379
 https://ubuntu.com/security/notices/USN-4752-1
Description:
 Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before
 5.8 allows local users to gain privileges or cause a denial of service by
 leveraging improper access to a certain error field.
Ubuntu-Description:
 It was discovered that the block layer implementation in the Linux kernel
 did not properly perform reference counting in some situations, leading to
 a use-after-free vulnerability. A local attacker could use this to cause a
 denial of service (system crash).
Notes:
Mitigation:
Bugs:
Priority: medium
Discovered-by:
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H [6.7 MEDIUM]

Patches_linux:
 break-fix: 77ea887e433ad8389d416826936c110fa7910f80 2d3a8e2deddea6c89961c422ec0c5b851e648c14
upstream_linux: released (5.8~rc2)
precise/esm_linux: ignored (was needs-triage ESM criteria)
trusty_linux: ignored (out of standard support)
trusty/esm_linux: ignored (was needs-triage ESM criteria)
xenial_linux: released (4.4.0-187.217)
esm-infra/xenial_linux: released (4.4.0-187.217)
bionic_linux: released (4.15.0-115.116)
focal_linux: released (5.4.0-45.49)
groovy_linux: not-affected (5.8.0-16.17)
devel_linux: not-affected (5.8.0-36.40+21.04.1)

Patches_linux-hwe:
upstream_linux-hwe: released (5.8~rc2)
precise/esm_linux-hwe: DNE
trusty_linux-hwe: DNE
trusty/esm_linux-hwe: DNE
xenial_linux-hwe: released (4.15.0-115.116~16.04.1)
esm-infra/xenial_linux-hwe: released (4.15.0-115.116~16.04.1)
bionic_linux-hwe: ignored (replaced by linux-hwe-5.4)
focal_linux-hwe: DNE
groovy_linux-hwe: DNE
devel_linux-hwe: DNE

Patches_linux-hwe-5.4:
upstream_linux-hwe-5.4: released (5.8~rc2)
precise/esm_linux-hwe-5.4: DNE
trusty_linux-hwe-5.4: DNE
trusty/esm_linux-hwe-5.4: DNE
xenial_linux-hwe-5.4: DNE
bionic_linux-hwe-5.4: released (5.4.0-45.49~18.04.2)
focal_linux-hwe-5.4: DNE
groovy_linux-hwe-5.4: DNE
devel_linux-hwe-5.4: DNE

Patches_linux-hwe-edge:
upstream_linux-hwe-edge: released (5.8~rc2)
precise/esm_linux-hwe-edge: DNE
trusty_linux-hwe-edge: DNE
trusty/esm_linux-hwe-edge: DNE
xenial_linux-hwe-edge: ignored (superseded by linux-hwe)
esm-infra/xenial_linux-hwe-edge: ignored (superseded by linux-hwe)
bionic_linux-hwe-edge: ignored (superseded by linux-hwe-5.4)
focal_linux-hwe-edge: DNE
groovy_linux-hwe-edge: DNE
devel_linux-hwe-edge: DNE

Patches_linux-lts-trusty:
upstream_linux-lts-trusty: released (5.8~rc2)
precise/esm_linux-lts-trusty: ignored (was needs-triage ESM criteria)
trusty_linux-lts-trusty: DNE
trusty/esm_linux-lts-trusty: DNE
xenial_linux-lts-trusty: DNE
bionic_linux-lts-trusty: DNE
focal_linux-lts-trusty: DNE
groovy_linux-lts-trusty: DNE
devel_linux-lts-trusty: DNE

Patches_linux-lts-xenial:
upstream_linux-lts-xenial: released (5.8~rc2)
precise/esm_linux-lts-xenial: DNE
trusty_linux-lts-xenial: ignored (out of standard support)
trusty/esm_linux-lts-xenial: ignored (was needs-triage ESM criteria)
xenial_linux-lts-xenial: DNE
bionic_linux-lts-xenial: DNE
focal_linux-lts-xenial: DNE
groovy_linux-lts-xenial: DNE
devel_linux-lts-xenial: DNE

Patches_linux-kvm:
upstream_linux-kvm: released (5.8~rc2)
precise/esm_linux-kvm: DNE
trusty_linux-kvm: DNE
trusty/esm_linux-kvm: DNE
xenial_linux-kvm: released (4.4.0-1078.85)
esm-infra/xenial_linux-kvm: released (4.4.0-1078.85)
bionic_linux-kvm: released (4.15.0-1072.73)
focal_linux-kvm: released (5.4.0-1021.21)
groovy_linux-kvm: not-affected (5.8.0-1001.1)
devel_linux-kvm: not-affected (5.8.0-1010.11+21.04.1)

Patches_linux-aws:
upstream_linux-aws: released (5.8~rc2)
precise/esm_linux-aws: DNE
trusty_linux-aws: ignored (out of standard support)
trusty/esm_linux-aws: ignored (was needs-triage ESM criteria)
xenial_linux-aws: released (4.4.0-1112.124)
esm-infra/xenial_linux-aws: released (4.4.0-1112.124)
bionic_linux-aws: released (4.15.0-1080.84)
focal_linux-aws: released (5.4.0-1022.22)
groovy_linux-aws: not-affected (5.8.0-1004.4)
devel_linux-aws: not-affected (5.8.0-1018.20+21.04.1)

Patches_linux-aws-5.0:
upstream_linux-aws-5.0: released (5.8~rc2)
precise/esm_linux-aws-5.0: DNE
trusty_linux-aws-5.0: DNE
trusty/esm_linux-aws-5.0: DNE
xenial_linux-aws-5.0: DNE
bionic_linux-aws-5.0: ignored (superseded by linux-aws-5.3)
focal_linux-aws-5.0: DNE
groovy_linux-aws-5.0: DNE
devel_linux-aws-5.0: DNE

Patches_linux-aws-5.3:
upstream_linux-aws-5.3: released (5.8~rc2)
precise/esm_linux-aws-5.3: DNE
trusty_linux-aws-5.3: DNE
trusty/esm_linux-aws-5.3: DNE
xenial_linux-aws-5.3: DNE
bionic_linux-aws-5.3: ignored (superseded by linux-aws-5.4)
focal_linux-aws-5.3: DNE
groovy_linux-aws-5.3: DNE
devel_linux-aws-5.3: DNE

Patches_linux-aws-5.4:
upstream_linux-aws-5.4: released (5.8~rc2)
precise/esm_linux-aws-5.4: DNE
trusty_linux-aws-5.4: DNE
trusty/esm_linux-aws-5.4: DNE
xenial_linux-aws-5.4: DNE
bionic_linux-aws-5.4: released (5.4.0-1022.22~18.04.1)
focal_linux-aws-5.4: DNE
groovy_linux-aws-5.4: DNE
devel_linux-aws-5.4: DNE

Patches_linux-aws-hwe:
upstream_linux-aws-hwe: released (5.8~rc2)
precise/esm_linux-aws-hwe: DNE
trusty_linux-aws-hwe: DNE
trusty/esm_linux-aws-hwe: DNE
xenial_linux-aws-hwe: released (4.15.0-1080.84~16.04.1)
esm-infra/xenial_linux-aws-hwe: released (4.15.0-1080.84~16.04.1)
bionic_linux-aws-hwe: DNE
focal_linux-aws-hwe: DNE
groovy_linux-aws-hwe: DNE
devel_linux-aws-hwe: DNE

Patches_linux-azure:
upstream_linux-azure: released (5.8~rc2)
precise/esm_linux-azure: DNE
trusty_linux-azure: ignored (out of standard support)
trusty/esm_linux-azure: ignored (was needs-triage ESM criteria)
xenial_linux-azure: released (4.15.0-1093.103~16.04.1)
esm-infra/xenial_linux-azure: released (4.15.0-1093.103~16.04.1)
bionic_linux-azure: ignored (superseded by linux-azure-5.3)
focal_linux-azure: released (5.4.0-1023.23)
groovy_linux-azure: not-affected (5.8.0-1004.4)
devel_linux-azure: not-affected (5.8.0-1016.17+21.04.1)

Patches_linux-azure-4.15:
upstream_linux-azure-4.15: released (5.8~rc2)
precise/esm_linux-azure-4.15: DNE
trusty_linux-azure-4.15: DNE
trusty/esm_linux-azure-4.15: DNE
xenial_linux-azure-4.15: DNE
bionic_linux-azure-4.15: released (4.15.0-1093.103)
focal_linux-azure-4.15: DNE
groovy_linux-azure-4.15: DNE
devel_linux-azure-4.15: DNE

Patches_linux-azure-5.3:
upstream_linux-azure-5.3: released (5.8~rc2)
precise/esm_linux-azure-5.3: DNE
trusty_linux-azure-5.3: DNE
trusty/esm_linux-azure-5.3: DNE
xenial_linux-azure-5.3: DNE
bionic_linux-azure-5.3: ignored (superseded by linux-azure-5.4)
focal_linux-azure-5.3: DNE
groovy_linux-azure-5.3: DNE
devel_linux-azure-5.3: DNE

Patches_linux-azure-5.4:
upstream_linux-azure-5.4: released (5.8~rc2)
precise/esm_linux-azure-5.4: DNE
trusty_linux-azure-5.4: DNE
trusty/esm_linux-azure-5.4: DNE
xenial_linux-azure-5.4: DNE
bionic_linux-azure-5.4: released (5.4.0-1023.23~18.04.1)
focal_linux-azure-5.4: DNE
groovy_linux-azure-5.4: DNE
devel_linux-azure-5.4: DNE

Patches_linux-azure-edge:
upstream_linux-azure-edge: released (5.8~rc2)
precise/esm_linux-azure-edge: DNE
trusty_linux-azure-edge: DNE
trusty/esm_linux-azure-edge: DNE
xenial_linux-azure-edge: DNE
bionic_linux-azure-edge: ignored (superseded by linux-azure-5.3)
focal_linux-azure-edge: DNE
groovy_linux-azure-edge: DNE
devel_linux-azure-edge: DNE

Patches_linux-gcp:
upstream_linux-gcp: released (5.8~rc2)
precise/esm_linux-gcp: DNE
trusty_linux-gcp: DNE
trusty/esm_linux-gcp: DNE
xenial_linux-gcp: released (4.15.0-1081.92~16.04.1)
esm-infra/xenial_linux-gcp: released (4.15.0-1081.92~16.04.1)
bionic_linux-gcp: ignored (superseded by linux-gcp-5.3)
focal_linux-gcp: released (5.4.0-1022.22)
groovy_linux-gcp: not-affected (5.8.0-1002.2)
devel_linux-gcp: not-affected (5.8.0-1015.15+21.04.1)

Patches_linux-gcp-4.15:
upstream_linux-gcp-4.15: released (5.8~rc2)
precise/esm_linux-gcp-4.15: DNE
trusty_linux-gcp-4.15: DNE
trusty/esm_linux-gcp-4.15: DNE
xenial_linux-gcp-4.15: DNE
bionic_linux-gcp-4.15: released (4.15.0-1081.92)
focal_linux-gcp-4.15: DNE
groovy_linux-gcp-4.15: DNE
devel_linux-gcp-4.15: DNE

Patches_linux-gcp-5.3:
upstream_linux-gcp-5.3: released (5.8~rc2)
precise/esm_linux-gcp-5.3: DNE
trusty_linux-gcp-5.3: DNE
trusty/esm_linux-gcp-5.3: DNE
xenial_linux-gcp-5.3: DNE
bionic_linux-gcp-5.3: ignored (superseded by linux-gcp-5.4)
focal_linux-gcp-5.3: DNE
groovy_linux-gcp-5.3: DNE
devel_linux-gcp-5.3: DNE

Patches_linux-gcp-5.4:
upstream_linux-gcp-5.4: released (5.8~rc2)
precise/esm_linux-gcp-5.4: DNE
trusty_linux-gcp-5.4: DNE
trusty/esm_linux-gcp-5.4: DNE
xenial_linux-gcp-5.4: DNE
bionic_linux-gcp-5.4: released (5.4.0-1022.22~18.04.1)
focal_linux-gcp-5.4: DNE
groovy_linux-gcp-5.4: DNE
devel_linux-gcp-5.4: DNE

Patches_linux-gcp-edge:
upstream_linux-gcp-edge: released (5.8~rc2)
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: ignored (superseded by linux-gcp-5.3)
focal_linux-gcp-edge: DNE
groovy_linux-gcp-edge: DNE
devel_linux-gcp-edge: DNE

Patches_linux-gke-4.15:
upstream_linux-gke-4.15: released (5.8~rc2)
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 (4.15.0-1067.70)
focal_linux-gke-4.15: DNE
groovy_linux-gke-4.15: DNE
devel_linux-gke-4.15: DNE

Patches_linux-gke-5.0:
upstream_linux-gke-5.0: released (5.8~rc2)
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: released (5.0.0-1046.47)
focal_linux-gke-5.0: DNE
groovy_linux-gke-5.0: DNE
devel_linux-gke-5.0: DNE

Patches_linux-gke-5.3:
upstream_linux-gke-5.3: released (5.8~rc2)
precise/esm_linux-gke-5.3: DNE
trusty_linux-gke-5.3: DNE
trusty/esm_linux-gke-5.3: DNE
xenial_linux-gke-5.3: DNE
bionic_linux-gke-5.3: released (5.3.0-1033.35)
focal_linux-gke-5.3: DNE
groovy_linux-gke-5.3: DNE
devel_linux-gke-5.3: DNE

Patches_linux-oracle:
upstream_linux-oracle: released (5.8~rc2)
precise/esm_linux-oracle: DNE
trusty_linux-oracle: DNE
trusty/esm_linux-oracle: DNE
xenial_linux-oracle: released (4.15.0-1051.55~16.04.1)
esm-infra/xenial_linux-oracle: released (4.15.0-1051.55~16.04.1)
bionic_linux-oracle: released (4.15.0-1051.55)
focal_linux-oracle: released (5.4.0-1022.22)
groovy_linux-oracle: not-affected (5.8.0-1001.1)
devel_linux-oracle: not-affected (5.8.0-1014.14+21.04.1)

Patches_linux-oracle-5.0:
upstream_linux-oracle-5.0: released (5.8~rc2)
precise/esm_linux-oracle-5.0: DNE
trusty_linux-oracle-5.0: DNE
trusty/esm_linux-oracle-5.0: DNE
xenial_linux-oracle-5.0: DNE
bionic_linux-oracle-5.0: ignored (superseded by linux-oracle-5.3)
focal_linux-oracle-5.0: DNE
groovy_linux-oracle-5.0: DNE
devel_linux-oracle-5.0: DNE

Patches_linux-oracle-5.3:
upstream_linux-oracle-5.3: released (5.8~rc2)
precise/esm_linux-oracle-5.3: DNE
trusty_linux-oracle-5.3: DNE
trusty/esm_linux-oracle-5.3: DNE
xenial_linux-oracle-5.3: DNE
bionic_linux-oracle-5.3: ignored (superseded by linux-oracle-5.4)
focal_linux-oracle-5.3: DNE
groovy_linux-oracle-5.3: DNE
devel_linux-oracle-5.3: DNE

Patches_linux-oracle-5.4:
upstream_linux-oracle-5.4: released (5.8~rc2)
precise/esm_linux-oracle-5.4: DNE
trusty_linux-oracle-5.4: DNE
trusty/esm_linux-oracle-5.4: DNE
xenial_linux-oracle-5.4: DNE
bionic_linux-oracle-5.4: released (5.4.0-1022.22~18.04.1)
focal_linux-oracle-5.4: DNE
groovy_linux-oracle-5.4: DNE
devel_linux-oracle-5.4: DNE

Patches_linux-oem:
upstream_linux-oem: released (5.8~rc2)
precise/esm_linux-oem: DNE
trusty_linux-oem: DNE
trusty/esm_linux-oem: DNE
xenial_linux-oem: ignored (superseded by linux-hwe)
bionic_linux-oem: released (4.15.0-1094.104)
focal_linux-oem: DNE
groovy_linux-oem: DNE
devel_linux-oem: DNE

Patches_linux-oem-5.6:
upstream_linux-oem-5.6: released (5.8~rc2)
precise/esm_linux-oem-5.6: DNE
trusty_linux-oem-5.6: DNE
trusty/esm_linux-oem-5.6: DNE
xenial_linux-oem-5.6: DNE
bionic_linux-oem-5.6: DNE
focal_linux-oem-5.6: released (5.6.0-1048.52)
groovy_linux-oem-5.6: DNE
devel_linux-oem-5.6: DNE

Patches_linux-oem-osp1:
upstream_linux-oem-osp1: released (5.8~rc2)
precise/esm_linux-oem-osp1: DNE
trusty_linux-oem-osp1: DNE
trusty/esm_linux-oem-osp1: DNE
xenial_linux-oem-osp1: DNE
bionic_linux-oem-osp1: ignored (was needs-triage now end-of-life)
focal_linux-oem-osp1: DNE
groovy_linux-oem-osp1: DNE
devel_linux-oem-osp1: DNE

Patches_linux-raspi:
upstream_linux-raspi: released (5.8~rc2)
precise/esm_linux-raspi: DNE
trusty_linux-raspi: DNE
trusty/esm_linux-raspi: DNE
xenial_linux-raspi: DNE
bionic_linux-raspi: DNE
focal_linux-raspi: released (5.4.0-1016.17)
groovy_linux-raspi: not-affected (5.4.0-1016.17)
devel_linux-raspi: not-affected (5.8.0-1008.11+21.04.1)

Patches_linux-raspi2:
upstream_linux-raspi2: released (5.8~rc2)
precise/esm_linux-raspi2: DNE
trusty_linux-raspi2: DNE
trusty/esm_linux-raspi2: DNE
xenial_linux-raspi2: released (4.4.0-1137.146)
bionic_linux-raspi2: released (4.15.0-1068.72)
focal_linux-raspi2: ignored (replaced by linux-raspi)
groovy_linux-raspi2: DNE
devel_linux-raspi2: DNE

Patches_linux-raspi2-5.3:
upstream_linux-raspi2-5.3: released (5.8~rc2)
precise/esm_linux-raspi2-5.3: DNE
trusty_linux-raspi2-5.3: DNE
trusty/esm_linux-raspi2-5.3: DNE
xenial_linux-raspi2-5.3: DNE
bionic_linux-raspi2-5.3: released (5.3.0-1032.34)
focal_linux-raspi2-5.3: DNE
groovy_linux-raspi2-5.3: DNE
devel_linux-raspi2-5.3: DNE

Patches_linux-raspi-5.4:
upstream_linux-raspi-5.4: released (5.8~rc2)
precise/esm_linux-raspi-5.4: DNE
trusty_linux-raspi-5.4: DNE
trusty/esm_linux-raspi-5.4: DNE
xenial_linux-raspi-5.4: DNE
bionic_linux-raspi-5.4: released (5.4.0-1016.17~18.04.1)
focal_linux-raspi-5.4: DNE
groovy_linux-raspi-5.4: DNE
devel_linux-raspi-5.4: DNE

Patches_linux-riscv:
upstream_linux-riscv: released (5.8~rc2)
precise/esm_linux-riscv: DNE
trusty_linux-riscv: DNE
trusty/esm_linux-riscv: DNE
xenial_linux-riscv: DNE
bionic_linux-riscv: DNE
focal_linux-riscv: released (5.4.0-31.35)
groovy_linux-riscv: not-affected (5.8.0-1.1)
devel_linux-riscv: not-affected (5.8.0-10.12+21.04.1)

Patches_linux-snapdragon:
upstream_linux-snapdragon: released (5.8~rc2)
precise/esm_linux-snapdragon: DNE
trusty_linux-snapdragon: DNE
trusty/esm_linux-snapdragon: DNE
xenial_linux-snapdragon: released (4.4.0-1141.149)
bionic_linux-snapdragon: released (4.15.0-1084.92)
focal_linux-snapdragon: DNE
groovy_linux-snapdragon: DNE
devel_linux-snapdragon: DNE

Patches_linux-hwe-5.8:
upstream_linux-hwe-5.8: released (5.8~rc2)
precise/esm_linux-hwe-5.8: DNE
trusty_linux-hwe-5.8: DNE
trusty/esm_linux-hwe-5.8: DNE
xenial_linux-hwe-5.8: DNE
bionic_linux-hwe-5.8: DNE
focal_linux-hwe-5.8: not-affected (5.8.0-23.24~20.04.1)
groovy_linux-hwe-5.8: DNE
devel_linux-hwe-5.8: DNE

Patches_linux-gke-5.4:
upstream_linux-gke-5.4: released (5.8~rc2)
precise/esm_linux-gke-5.4: DNE
trusty_linux-gke-5.4: DNE
trusty/esm_linux-gke-5.4: DNE
xenial_linux-gke-5.4: DNE
bionic_linux-gke-5.4: not-affected (5.4.0-1025.25~18.04.1)
focal_linux-gke-5.4: DNE
groovy_linux-gke-5.4: DNE
devel_linux-gke-5.4: DNE

Patches_linux-gkeop-5.4:
upstream_linux-gkeop-5.4: released (5.8~rc2)
precise/esm_linux-gkeop-5.4: DNE
trusty_linux-gkeop-5.4: DNE
trusty/esm_linux-gkeop-5.4: DNE
xenial_linux-gkeop-5.4: DNE
bionic_linux-gkeop-5.4: not-affected (5.4.0-1001.1)
focal_linux-gkeop-5.4: DNE
groovy_linux-gkeop-5.4: DNE
devel_linux-gkeop-5.4: DNE

Patches_linux-dell300x:
upstream_linux-dell300x: released (5.8~rc2)
precise/esm_linux-dell300x: DNE
trusty_linux-dell300x: DNE
trusty/esm_linux-dell300x: DNE
xenial_linux-dell300x: DNE
bionic_linux-dell300x: not-affected (4.15.0-1005.8)
focal_linux-dell300x: DNE
groovy_linux-dell300x: DNE
devel_linux-dell300x: DNE

Patches_linux-oem-5.10:
upstream_linux-oem-5.10: released (5.8~rc2)
precise/esm_linux-oem-5.10: DNE
trusty_linux-oem-5.10: DNE
trusty/esm_linux-oem-5.10: DNE
xenial_linux-oem-5.10: DNE
bionic_linux-oem-5.10: DNE
focal_linux-oem-5.10: not-affected (5.10.0-1008.9)
groovy_linux-oem-5.10: DNE
devel_linux-oem-5.10: DNE

Patches_linux-gkeop:
upstream_linux-gkeop: released (5.8~rc2)
precise/esm_linux-gkeop: DNE
trusty_linux-gkeop: DNE
trusty/esm_linux-gkeop: DNE
xenial_linux-gkeop: DNE
bionic_linux-gkeop: DNE
focal_linux-gkeop: not-affected (5.4.0-1008.9)
groovy_linux-gkeop: DNE
devel_linux-gkeop: DNE