Candidate: CVE-2020-9391
PublicDate: 2020-02-25 18:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9391
 https://git.kernel.org/linus/dcde237319e626d1ec3c9d8b7613032f0fd4663a
 http://www.openwall.com/lists/oss-security/2020/02/25/6
 https://bugzilla.redhat.com/show_bug.cgi?id=1797052
 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a
Description:
 An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on
 the AArch64 architecture. It ignores the top byte in the address passed to
 the brk system call, potentially moving the memory break downwards when the
 application expects it to move upwards, aka CID-dcde237319e6. This has been
 observed to cause heap corruption with the GNU C Library malloc
 implementation.
Ubuntu-Description:
Notes:
Mitigation:
Bugs:
Priority: medium
Discovered-by:
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H [5.5 MEDIUM]

Patches_linux:
 break-fix: ce18d171cb7368557e6498a3ce111d7d3dc03e4d dcde237319e626d1ec3c9d8b7613032f0fd4663a
upstream_linux: released (5.6~rc3)
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: 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)
eoan_linux: not-affected (5.0.0-13.14)
focal_linux: not-affected (5.4.0-18.22)
devel_linux: not-affected (5.4.0-26.30)

Patches_linux-hwe:
upstream_linux-hwe: released (5.6~rc3)
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: not-affected (4.18.0-13.14~18.04.1)
eoan_linux-hwe: DNE
focal_linux-hwe: DNE
devel_linux-hwe: DNE

Patches_linux-hwe-edge:
upstream_linux-hwe-edge: released (5.6~rc3)
precise/esm_linux-hwe-edge: DNE
trusty_linux-hwe-edge: DNE
trusty/esm_linux-hwe-edge: DNE
xenial_linux-hwe-edge: ignored (was needs-triage now end-of-life)
esm-infra/xenial_linux-hwe-edge: ignored (was needs-triage now end-of-life)
bionic_linux-hwe-edge: ignored (was needs-triage now end-of-life)
eoan_linux-hwe-edge: DNE
focal_linux-hwe-edge: DNE
devel_linux-hwe-edge: DNE

Patches_linux-lts-xenial:
upstream_linux-lts-xenial: released (5.6~rc3)
precise/esm_linux-lts-xenial: DNE
trusty_linux-lts-xenial: ignored (out of standard support)
trusty/esm_linux-lts-xenial: not-affected (4.4.0-13.29~14.04.1)
xenial_linux-lts-xenial: DNE
bionic_linux-lts-xenial: DNE
eoan_linux-lts-xenial: DNE
focal_linux-lts-xenial: DNE
devel_linux-lts-xenial: DNE

Patches_linux-lts-trusty:
upstream_linux-lts-trusty: released (5.6~rc3)
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
eoan_linux-lts-trusty: DNE
focal_linux-lts-trusty: DNE
devel_linux-lts-trusty: DNE

Patches_linux-oem:
upstream_linux-oem: released (5.6~rc3)
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: not-affected (4.15.0-1002.3)
eoan_linux-oem: not-affected (4.15.0-1035.40)
focal_linux-oem: DNE
devel_linux-oem: DNE

Patches_linux-oem-osp1:
upstream_linux-oem-osp1: released (5.6~rc3)
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: not-affected (5.0.0-1010.11)
eoan_linux-oem-osp1: not-affected (5.0.0-1010.11)
focal_linux-oem-osp1: DNE
devel_linux-oem-osp1: DNE

Patches_linux-kvm:
upstream_linux-kvm: released (5.6~rc3)
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)
eoan_linux-kvm: not-affected (5.0.0-1004.4)
focal_linux-kvm: not-affected (5.4.0-1004.4)
devel_linux-kvm: not-affected (5.4.0-1009.9)

Patches_linux-aws:
upstream_linux-aws: released (5.6~rc3)
precise/esm_linux-aws: DNE
trusty_linux-aws: ignored (out of standard support)
trusty/esm_linux-aws: not-affected (4.4.0-1002.2)
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)
eoan_linux-aws: not-affected (5.0.0-1004.4)
focal_linux-aws: not-affected (5.4.0-1005.5)
devel_linux-aws: not-affected (5.4.0-1009.9)

Patches_linux-aws-5.0:
upstream_linux-aws-5.0: released (5.6~rc3)
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: not-affected (5.0.0-1021.24~18.04.1)
eoan_linux-aws-5.0: DNE
focal_linux-aws-5.0: DNE
devel_linux-aws-5.0: DNE

Patches_linux-aws-hwe:
upstream_linux-aws-hwe: released (5.6~rc3)
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
eoan_linux-aws-hwe: DNE
focal_linux-aws-hwe: DNE
devel_linux-aws-hwe: DNE

Patches_linux-azure:
upstream_linux-azure: released (5.6~rc3)
precise/esm_linux-azure: DNE
trusty_linux-azure: ignored (out of standard support)
trusty/esm_linux-azure: not-affected (4.15.0-1023.24~14.04.1)
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: not-affected (4.15.0-1002.2)
eoan_linux-azure: not-affected (5.0.0-1004.4)
focal_linux-azure: not-affected (5.4.0-1006.6)
devel_linux-azure: not-affected (5.4.0-1010.10)

Patches_linux-azure-5.3:
upstream_linux-azure-5.3: released (5.6~rc3)
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: not-affected (5.3.0-1007.8~18.04.1)
eoan_linux-azure-5.3: DNE
focal_linux-azure-5.3: DNE
devel_linux-azure-5.3: DNE

Patches_linux-azure-edge:
upstream_linux-azure-edge: released (5.6~rc3)
precise/esm_linux-azure-edge: DNE
trusty_linux-azure-edge: DNE
trusty/esm_linux-azure-edge: DNE
xenial_linux-azure-edge: ignored (was needs-triage now end-of-life)
bionic_linux-azure-edge: ignored (was needs-triage now end-of-life)
eoan_linux-azure-edge: DNE
focal_linux-azure-edge: DNE
devel_linux-azure-edge: DNE

Patches_linux-gcp:
upstream_linux-gcp: released (5.6~rc3)
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: not-affected (4.15.0-1001.1)
eoan_linux-gcp: not-affected (5.0.0-1004.4)
focal_linux-gcp: not-affected (5.4.0-1005.5)
devel_linux-gcp: not-affected (5.4.0-1009.9)

Patches_linux-gcp-5.3:
upstream_linux-gcp-5.3: released (5.6~rc3)
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: not-affected (5.3.0-1008.9~18.04.1)
eoan_linux-gcp-5.3: DNE
focal_linux-gcp-5.3: DNE
devel_linux-gcp-5.3: DNE

Patches_linux-gcp-edge:
upstream_linux-gcp-edge: released (5.6~rc3)
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 (was needs-triage now end-of-life)
eoan_linux-gcp-edge: DNE
focal_linux-gcp-edge: DNE
devel_linux-gcp-edge: DNE

Patches_linux-gke-4.15:
upstream_linux-gke-4.15: released (5.6~rc3)
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)
eoan_linux-gke-4.15: DNE
focal_linux-gke-4.15: DNE
devel_linux-gke-4.15: DNE

Patches_linux-gke-5.0:
upstream_linux-gke-5.0: released (5.6~rc3)
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)
eoan_linux-gke-5.0: DNE
focal_linux-gke-5.0: DNE
devel_linux-gke-5.0: DNE

Patches_linux-oracle:
upstream_linux-oracle: released (5.6~rc3)
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)
eoan_linux-oracle: not-affected (4.15.0-1011.13)
focal_linux-oracle: not-affected (5.4.0-1005.5)
devel_linux-oracle: not-affected (5.4.0-1009.9)

Patches_linux-oracle-5.0:
upstream_linux-oracle-5.0: released (5.6~rc3)
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: not-affected (5.0.0-1007.12~18.04.1)
eoan_linux-oracle-5.0: DNE
focal_linux-oracle-5.0: DNE
devel_linux-oracle-5.0: DNE

Patches_linux-raspi2:
upstream_linux-raspi2: released (5.6~rc3)
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)
eoan_linux-raspi2: not-affected (5.0.0-1006.6)
focal_linux-raspi2: ignored (was pending \[5.4.0-1006.6\] now end-of-life)
devel_linux-raspi2: ignored (was pending \[5.4.0-1006.6\] now end-of-life)

Patches_linux-snapdragon:
upstream_linux-snapdragon: released (5.6~rc3)
precise/esm_linux-snapdragon: DNE
trusty_linux-snapdragon: DNE
trusty/esm_linux-snapdragon: DNE
xenial_linux-snapdragon: not-affected (4.4.0-1012.12)
bionic_linux-snapdragon: not-affected (4.4.0-1077.82)
eoan_linux-snapdragon: DNE
focal_linux-snapdragon: DNE
devel_linux-snapdragon: DNE

Patches_linux-raspi2-5.3:
upstream_linux-raspi2-5.3: released (5.6~rc3)
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)
eoan_linux-raspi2-5.3: DNE
focal_linux-raspi2-5.3: DNE
devel_linux-raspi2-5.3: DNE

Patches_linux-oem-5.6:
upstream_linux-oem-5.6: released (5.6~rc3)
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
eoan_linux-oem-5.6: DNE
focal_linux-oem-5.6: not-affected (5.6.0-1007.7)
devel_linux-oem-5.6: not-affected (5.6.0-1007.7)

Patches_linux-gke-5.3:
upstream_linux-gke-5.3: released (5.6~rc3)
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)
eoan_linux-gke-5.3: DNE
focal_linux-gke-5.3: DNE
devel_linux-gke-5.3: DNE

Patches_linux-oracle-5.3:
upstream_linux-oracle-5.3: released (5.6~rc3)
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: not-affected (5.3.0-1011.12~18.04.1)
eoan_linux-oracle-5.3: DNE
focal_linux-oracle-5.3: DNE
devel_linux-oracle-5.3: DNE