Candidate: CVE-2020-27825
PublicDate: 2020-12-11 19:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27825
 https://github.com/torvalds/linux/commit/bbeb97464eefc65f506084fd9f18f21653e01137#diff-446a57a3a8781d7d3fb410eb7162dd2002dd363bf1ea936c4fd10397660033e0
 https://www.openwall.com/lists/oss-security/2020/12/11/1
Description:
 A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux
 kernel (before 5.10-rc1). There was a race problem in trace_open and resize
 of cpu buffer running parallely on different cpus, may cause a denial of
 service problem (DOS). This flaw could even allow a local attacker with
 special user privilege to a kernel information leak threat.
Ubuntu-Description:
Notes:
Mitigation:
Bugs:
Priority: medium
Discovered-by: Adam Zabrocki
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:H [5.7 MEDIUM]

Patches_linux:
 break-fix: b23d7a5f4a07af02343cdd28fe1f7488bac3afda bbeb97464eefc65f506084fd9f18f21653e01137
upstream_linux: released (5.10~rc1)
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: not-affected (4.2.0-16.19)
esm-infra/xenial_linux: not-affected (4.2.0-16.19)
bionic_linux: not-affected (4.13.0-16.19)
focal_linux: not-affected (5.4.0-9.12)
groovy_linux: not-affected (5.4.0-26.30)
devel_linux: not-affected (5.8.0-34.37+21.04.1)

Patches_linux-hwe:
upstream_linux-hwe: released (5.10~rc1)
precise/esm_linux-hwe: DNE
trusty_linux-hwe: DNE
trusty/esm_linux-hwe: DNE
xenial_linux-hwe: not-affected (4.8.0-36.36~16.04.1)
esm-infra/xenial_linux-hwe: not-affected (4.8.0-36.36~16.04.1)
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 (5.10~rc1)
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: not-affected (5.4.0-37.41~18.04.1)
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 (5.10~rc1)
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xenial_linux-hwe-edge: ignored (superseded by linux-hwe)
esm-infra/xenial_linux-hwe-edge: ignored (superseded by linux-hwe)
bionic_linux-hwe-edge: ignored (superseded by linux-hwe-5.4)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 (5.10~rc1)
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 (5.10~rc1)
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 (5.10~rc1)
precise/esm_linux-kvm: DNE
trusty_linux-kvm: DNE
trusty/esm_linux-kvm: DNE
xenial_linux-kvm: not-affected (4.4.0-1004.9)
esm-infra/xenial_linux-kvm: not-affected (4.4.0-1004.9)
bionic_linux-kvm: not-affected (4.15.0-1002.2)
focal_linux-kvm: not-affected (5.4.0-1004.4)
groovy_linux-kvm: not-affected (5.4.0-1009.9)
devel_linux-kvm: not-affected (5.8.0-1010.11+21.04.1)

Patches_linux-aws:
upstream_linux-aws: released (5.10~rc1)
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: not-affected (4.4.0-1001.10)
esm-infra/xenial_linux-aws: not-affected (4.4.0-1001.10)
bionic_linux-aws: not-affected (4.15.0-1001.1)
focal_linux-aws: not-affected (5.4.0-1005.5)
groovy_linux-aws: not-affected (5.4.0-1009.9)
devel_linux-aws: not-affected (5.8.0-1017.18+21.04.2)

Patches_linux-aws-5.0:
upstream_linux-aws-5.0: released (5.10~rc1)
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 (5.10~rc1)
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 (5.10~rc1)
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: not-affected (5.4.0-1018.18~18.04.1)
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 (5.10~rc1)
precise/esm_linux-aws-hwe: DNE
trusty_linux-aws-hwe: DNE
trusty/esm_linux-aws-hwe: DNE
xenial_linux-aws-hwe: not-affected (4.15.0-1030.31~16.04.1)
esm-infra/xenial_linux-aws-hwe: not-affected (4.15.0-1030.31~16.04.1)
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 (5.10~rc1)
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: not-affected (4.11.0-1009.9)
esm-infra/xenial_linux-azure: not-affected (4.11.0-1009.9)
bionic_linux-azure: ignored (superseded by linux-azure-5.3)
focal_linux-azure: not-affected (5.4.0-1006.6)
groovy_linux-azure: not-affected (5.4.0-1010.10)
devel_linux-azure: not-affected (5.8.0-1016.17+21.04.1)

Patches_linux-azure-4.15:
upstream_linux-azure-4.15: released (5.10~rc1)
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: not-affected (4.15.0-1082.92)
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 (5.10~rc1)
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 (5.10~rc1)
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: not-affected (5.4.0-1020.20~18.04.1)
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 (5.10~rc1)
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 (5.10~rc1)
precise/esm_linux-gcp: DNE
trusty_linux-gcp: DNE
trusty/esm_linux-gcp: DNE
xenial_linux-gcp: not-affected (4.10.0-1004.4)
esm-infra/xenial_linux-gcp: not-affected (4.10.0-1004.4)
bionic_linux-gcp: ignored (superseded by linux-gcp-5.3)
focal_linux-gcp: not-affected (5.4.0-1005.5)
groovy_linux-gcp: not-affected (5.4.0-1009.9)
devel_linux-gcp: not-affected (5.8.0-1015.15+21.04.1)

Patches_linux-gcp-4.15:
upstream_linux-gcp-4.15: released (5.10~rc1)
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: not-affected (4.15.0-1071.81)
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 (5.10~rc1)
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 (5.10~rc1)
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: not-affected (5.4.0-1019.19~18.04.2)
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 (5.10~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: 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 (5.10~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: not-affected (4.15.0-1030.32)
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 (5.10~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)
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 (5.10~rc1)
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: not-affected (5.3.0-1011.12~18.04.1)
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 (5.10~rc1)
precise/esm_linux-oracle: DNE
trusty_linux-oracle: DNE
trusty/esm_linux-oracle: DNE
xenial_linux-oracle: not-affected (4.15.0-1007.9~16.04.1)
esm-infra/xenial_linux-oracle: not-affected (4.15.0-1007.9~16.04.1)
bionic_linux-oracle: not-affected (4.15.0-1007.9)
focal_linux-oracle: not-affected (5.4.0-1005.5)
groovy_linux-oracle: not-affected (5.4.0-1009.9)
devel_linux-oracle: not-affected (5.8.0-1014.14+21.04.1)

Patches_linux-oracle-5.0:
upstream_linux-oracle-5.0: released (5.10~rc1)
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 (5.10~rc1)
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 (5.10~rc1)
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: not-affected (5.4.0-1019.19~18.04.1)
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 (5.10~rc1)
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: ignored (was needs-triage now end-of-life)
focal_linux-oem: DNE
groovy_linux-oem: DNE
devel_linux-oem: DNE

Patches_linux-oem-5.6:
upstream_linux-oem-5.6: released (5.10~rc1)
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: not-affected (5.6.0-1007.7)
groovy_linux-oem-5.6: DNE
devel_linux-oem-5.6: DNE

Patches_linux-oem-osp1:
upstream_linux-oem-osp1: released (5.10~rc1)
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 (5.10~rc1)
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: not-affected (5.4.0-1007.7)
groovy_linux-raspi: not-affected (5.4.0-1008.8)
devel_linux-raspi: not-affected (5.8.0-1008.11+21.04.1)

Patches_linux-raspi2:
upstream_linux-raspi2: released (5.10~rc1)
precise/esm_linux-raspi2: DNE
trusty_linux-raspi2: DNE
trusty/esm_linux-raspi2: DNE
xenial_linux-raspi2: not-affected (4.2.0-1013.19)
bionic_linux-raspi2: not-affected (4.13.0-1005.5)
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 (5.10~rc1)
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: not-affected (5.3.0-1017.19~18.04.1)
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 (5.10~rc1)
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: not-affected (5.4.0-1013.13~18.04.1)
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 (5.10~rc1)
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: not-affected (5.4.0-24.28)
groovy_linux-riscv: not-affected (5.4.0-24.28)
devel_linux-riscv: not-affected (5.8.0-10.12+21.04.1)

Patches_linux-snapdragon:
upstream_linux-snapdragon: released (5.10~rc1)
precise/esm_linux-snapdragon: DNE
trusty_linux-snapdragon: DNE
trusty/esm_linux-snapdragon: DNE
xenial_linux-snapdragon: not-affected (4.4.0-1013.15)
bionic_linux-snapdragon: not-affected (4.4.0-1077.82)
focal_linux-snapdragon: DNE
groovy_linux-snapdragon: DNE
devel_linux-snapdragon: DNE

Patches_linux-hwe-5.8:
upstream_linux-hwe-5.8: released (5.10~rc1)
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 (5.10~rc1)
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 (5.10~rc1)
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