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CVE-2020-36557

Date: July 20, 2022

A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.

Severity Score

5.1

Related Resources (7)

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2020-36557

Url: https://nvd.nist.gov/vuln/detail/CVE-2020-36557

Url: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca4463bf8438b403596edd0ec961ca0d4fbe0220

Url: https://access.redhat.com/security/cve/CVE-2020-36557

Url: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.2

Url: https://security-tracker.debian.org/tracker/CVE-2020-36557

Url: https://www.mend.io/vulnerability-database/CVE-2020-36557

Severity Score

5.1

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

Use After Free

CWE-416

CVSS v3.1

Base Score:	5.1
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	HIGH
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

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