CVE-2021-3640

Public on 2022-01-10

Modified on 2022-01-10

Description

A flaw use-after-free in function sco_sock_sendmsg() of the Linux kernel HCI subsystem was found in the way user calls ioct UFFDIO_REGISTER or other way triggers race condition of the call sco_conn_del() together with the call sco_sock_sendmsg() with the expected controllable faulting memory page. A privileged local user could use this flaw to crash the system or escalate their privileges on the system.

Severity

Medium

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CVSS v3 Base Score

6.7

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Affected Packages

Platform	Package	Release Date	Advisory
Amazon Linux 2 - Core	kernel	2025-01-30 22:56	ALAS2-2025-2752
Amazon Linux 2 - Core	kernel	2021-12-08 02:23	ALAS2-2021-1727
Amazon Linux 2 - Kernel-5.10 Extra	kernel	2024-02-01 20:10	ALAS2KERNEL-5.10-2024-049
Amazon Linux 2 - Kernel-5.10 Extra	kernel	2022-01-21 00:04	ALAS2KERNEL-5.10-2022-008
Amazon Linux 2 - Kernel-5.4 Extra	kernel	2022-01-20 19:13	ALAS2KERNEL-5.4-2022-010
Amazon Linux 2 - Kernel-5.4 Extra	kernel	2025-01-31 05:43	ALAS2KERNEL-5.4-2025-093

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	6.7	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD	CVSSv3	7.0	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	CVSSv2	6.9	AV:L/AC:M/Au:N/C:C/I:C/A:C

References

Red Hat: CVE-2021-3640 Mitre: CVE-2021-3640 FAQs regarding Amazon Linux ALAS/CVE Severity