CVE-2021-3573

Advisory lineage Upstream: 0 Downstream: 31
Modified
Published: 13 Aug 2021, 00:00
Last modified:03 Aug 2024, 17:01

Vulnerability Summary

Overall Risk (default)
medium
38/100
CVSS Score
6.9 MEDIUM
v2.0 (nvd)
EPSS Score
0.03% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

13 Aug 2021, 00:00
Published
Vulnerability first disclosed
03 Aug 2024, 17:01
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.4CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 6.9AV:L/AC:M/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.03%• Percentile: 9%

Techniques & Countermeasures

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

    The product contains a concurrent code sequence that 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 operating concurrently.

Affected Systems

  • fedoraproject•fedora

    34

  • linux•linux_kernel

    < 5.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4

  • redhat•enterprise_linux

    6.0 | 7.0 | 8.0

References (4)