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CVE-2020-29368

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Date: November 28, 2020

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.

Language: C

Severity Score

Related Resources (9)

https://security-tracker.debian.org/tracker/CVE-2020-29368
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-29368
https://security.netapp.com/advisory/ntap-20210108-0002/
https://access.redhat.com/security/cve/CVE-2020-29368
https://nvd.nist.gov/vuln/detail/CVE-2020-29368
https://bugs.chromium.org/p/project-zero/issues/detail?id=2045
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5
https://www.mend.io/vulnerability-database/CVE-2020-29368

Severity Score

Weakness Type (CWE)

Out-of-bounds Write

CWE-787

Race Conditions

CWE-362

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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