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CVE-2021-3573

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Date: August 12, 2021

A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5.

Language: C

Severity Score

Severity Score

Weakness Type (CWE)

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

CWE-362

Use After Free

CWE-416

Top Fix

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Upgrade Version

Upgrade to version linux-yocto - 4.8.26+gitAUTOINC+1c60e003c7_27efc3ba68;linux-yocto - 4.10+gitAUTOINC+805ea440c7_b259a5d744;linux-libc-headers - 5.13;linux-libc-headers - 5.8

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
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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