CVE-2020-36557 : A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lea

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.

Published 2022-07-21 04:15:10

Updated 2022-07-27 19:24:26

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2020-36557

Linux » Linux Kernel
Versions before (<) 5.6.2
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.06%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 21 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
5.1	MEDIUM	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	1.4	3.6	NIST
Attack Vector: Local Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Assigned by: nvd@nist.gov (Primary)
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Assigned by: nvd@nist.gov (Primary)

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