CVE-2020-9391

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1797052

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dcde237319e626d1ec3c9d8b7613032f0fd4663a

http://www.openwall.com/lists/oss-security/2020/02/25/6

https://lists.fedoraproject.org/archives/list/[email protected]/message/O4LH35HOPBJIKYHYFXMBBM75DN75PZHZ/

https://security.netapp.com/advisory/ntap-20200313-0003/

Details

Source: MITRE

Published: 2020-02-25

Updated: 2021-07-21

Type: CWE-119

Risk Information

CVSS v2

Base Score: 2.1

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:5.4:*:*:*:*:*:*:*

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from 5.5 to 5.5.6 (inclusive)

Configuration 2

OR

cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*

Tenable Plugins

View all (2 total)

IDNameProductFamilySeverity
136727Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2020-5691)NessusOracle Linux Local Security Checks
high
134187Fedora 31 : kernel / kernel-headers / kernel-tools (2020-3cd64d683c)NessusFedora Local Security Checks
medium