CVE-2020-29368

high

Description

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5

https://bugs.chromium.org/p/project-zero/issues/detail?id=2045

https://security.netapp.com/advisory/ntap-20210108-0002/

Details

Source: MITRE

Published: 2020-11-28

Updated: 2022-04-26

Type: CWE-362

Risk Information

CVSS v2

Base Score: 6.9

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

Impact Score: 10

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 7

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

Impact Score: 5.9

Exploitability Score: 1

Severity: HIGH