6.9

CVE-2021-3573: fedoraproject fedora

Modified
AliasesUBUNTU-CVE-2021-3573DEBIAN-CVE-2021-3573
Published 13-08-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-3573 is a medium (CVSS 6.9) vulnerability in fedoraproject fedora. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 31% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 6.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.9/10
010
Medium · v2.0 (NVD)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 29 · Related 21
DLA-2689-1DLA-2690-1MGASA-2021-0257MGASA-2021-0258OPENSUSE-SU-2021:2305-1OPENSUSE-SU-2021:2352-1

Timeline

  1. 13-08-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability 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

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.37% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (openwall.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu60 products
  • linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-154.161 | < 5.4.0-81.91
  • linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1110.117 | < 5.4.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11< 5.11.0-1016.17~20.04.1
  • linux-aws-5.3All versions (No fix recorded)
Debian1 product
  • linux< 5.10.46-1
Fedoraproject1 product
Linux1 product
  • linux_kernel< 5.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4
Redhat1 product

5 vendors · 64 products

References

14 links
Show all 14 references