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CVE-2021-4002

Date: March 3, 2022

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

Severity Score

Related Resources (13)

https://access.redhat.com/security/cve/CVE-2021-4002
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea
https://bugzilla.redhat.com/show_bug.cgi?id=2025726
https://www.openwall.com/lists/oss-security/2021/11/25/1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890
https://nvd.nist.gov/vuln/detail/CVE-2021-4002
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
https://www.debian.org/security/2022/dsa-5096
https://www.oracle.com/security-alerts/cpujul2022.html
https://security-tracker.debian.org/tracker/CVE-2021-4002
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4002
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
https://www.mend.io/vulnerability-database/CVE-2021-4002

Severity Score

Weakness Type (CWE)

Missing Release of Memory after Effective Lifetime

CWE-401

Incomplete Cleanup

CWE-459

CVSS v3.1

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

CVSS v2

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

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