CVE-2021-3752
A use-after-free flaw was found in the Linux kernel’s Bluetooth subsystem in the way user calls connect to the socket and disconnect simultaneously due to a race condition. This flaw allows a user to
02 Description
A use-after-free flaw was found in the Linux kernel’s Bluetooth subsystem in the way user calls connect to the socket and disconnect simultaneously due to a race condition. This flaw allows a user to
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.73% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 77.2% of scored records. A rank, not a probability.
- NVD base score
- 7.1 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2022-02-16 18:35Z4 YR AGO
- Last updated
- 2024-08-03 17:09Z2 YR AGO
- Reserved
- 2021-08-31
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- cf2d2a374f6ddfef1583e4e11689cdf1cc59447dacc1df9efacd2504188d4264
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1999544
- lore.kernel.orghttps://lore.kernel.org/lkml/20211115165435.133245729%40linuxfoundation.org/
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/09/15/4
- lists.debian.org[debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- lists.debian.org[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- www.debian.orgDSA-5096https://www.debian.org/security/2022/dsa-5096
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20220318-0009/
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-372.9.1.el8
- kernel Fixed in 4.18.0-372.9.1.el8
- kernel-abi-stablelists Fixed in 4.18.0-372.9.1.el8
- kernel-core Fixed in 4.18.0-372.9.1.el8
- kernel-cross-headers Fixed in 4.18.0-372.9.1.el8
- kernel-debug Fixed in 4.18.0-372.9.1.el8
- kernel-debug-core Fixed in 4.18.0-372.9.1.el8
- kernel-debug-devel Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-devel Fixed in 4.18.0-372.9.1.el8
- kernel-doc Fixed in 4.18.0-372.9.1.el8
- kernel-headers Fixed in 4.18.0-372.9.1.el8
- kernel-modules Fixed in 4.18.0-372.9.1.el8
- kernel-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-tools Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs-devel Fixed in 4.18.0-372.9.1.el8
- perf Fixed in 4.18.0-372.9.1.el8
- python3-perf Fixed in 4.18.0-372.9.1.el8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- linux No fix yet
- linux-hardened No fix yet
- linux-lts Fixed in 5.15.2-1
- linux-zen No fix yet
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- bpftool Fixed in 4.18.0-372.9.1.el8
- kernel Fixed in 4.18.0-372.9.1.el8
- kernel-abi-stablelists Fixed in 4.18.0-372.9.1.el8
- kernel-core Fixed in 4.18.0-372.9.1.el8
- kernel-cross-headers Fixed in 4.18.0-372.9.1.el8
- kernel-debug Fixed in 4.18.0-372.9.1.el8
- kernel-debug-core Fixed in 4.18.0-372.9.1.el8
- kernel-debug-devel Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-devel Fixed in 4.18.0-372.9.1.el8
- kernel-doc Fixed in 4.18.0-372.9.1.el8
- kernel-headers Fixed in 4.18.0-372.9.1.el8
- kernel-modules Fixed in 4.18.0-372.9.1.el8
- kernel-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-tools Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs-devel Fixed in 4.18.0-372.9.1.el8
- perf Fixed in 4.18.0-372.9.1.el8
- python3-perf Fixed in 4.18.0-372.9.1.el8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- linux Fixed in 5.15.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.15.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.15.3-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux-hwe-edge No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- linux Fixed in 4.15.0-167.175
- linux-aws Fixed in 4.15.0-1119.127
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1064.67~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1131.144
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1068.71~18.04.1
- linux-azure-edge No fix yet
- linux-dell300x Fixed in 4.15.0-1034.39
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1115.129
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1063.67~18.04.1
- linux-gcp-edge No fix yet
- linux-gke-4.15 No fix yet
- linux-gke-5.4 Fixed in 5.4.0-1061.64~18.04.1
- linux-gkeop-5.4 Fixed in 5.4.0-1032.33~18.04.1
- linux-hwe No fix yet
- linux-hwe-5.4 Fixed in 5.4.0-97.110~18.04.1
- linux-hwe-edge No fix yet
- linux-ibm-5.4 Fixed in 5.4.0-1014.15~18.04.1
- linux-kvm Fixed in 4.15.0-1106.108
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1086.94
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1062.66~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1052.58~18.04.1
- linux-raspi2 Fixed in 4.15.0-1102.109
- linux-snapdragon Fixed in 4.15.0-1119.128
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- linux Fixed in 5.4.0-97.110
- linux-aws Fixed in 5.4.0-1064.67
- linux-aws-5.13 Fixed in 5.13.0-1012.13~20.04.1
- linux-aws-5.8 No fix yet
- linux-azure Fixed in 5.4.0-1068.71
- linux-azure-5.13 Fixed in 5.13.0-1013.15~20.04.1
- linux-azure-5.8 No fix yet
- linux-gcp Fixed in 5.4.0-1063.67
- linux-gcp-5.11 Fixed in 5.11.0-1029.33~20.04.3
- linux-gcp-5.13 Fixed in 5.13.0-1013.16~20.04.1
- linux-gcp-5.8 No fix yet
- linux-gke Fixed in 5.4.0-1061.64
- linux-gkeop Fixed in 5.4.0-1032.33
- linux-hwe-5.11 No fix yet
- linux-hwe-5.13 Fixed in 5.13.0-28.31~20.04.1
- linux-hwe-5.8 No fix yet
- linux-ibm Fixed in 5.4.0-1013.14
- linux-intel-5.13 No fix yet
- linux-kvm Fixed in 5.4.0-1054.56
- linux-oem-5.10 Fixed in 5.10.0-1053.55
- linux-oem-5.13 Fixed in 5.13.0-1029.36
- linux-oem-5.14 Fixed in 5.14.0-1013.13
- linux-oem-5.6 No fix yet
- linux-oracle Fixed in 5.4.0-1062.66
- linux-oracle-5.11 Fixed in 5.11.0-1028.31~20.04.1
- linux-oracle-5.13 Fixed in 5.13.0-1016.20~20.04.1
- linux-oracle-5.8 No fix yet
- linux-raspi Fixed in 5.4.0-1052.58
- linux-raspi2 No fix yet
- linux-riscv No fix yet
- linux-riscv-5.11 No fix yet
- linux-riscv-5.8 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux-intel-iot-realtime No fix yet
- linux-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- linux-raspi-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- linux Fixed in 3.13.0-218.269Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro
- linux-aws Fixed in 4.4.0-1109.115Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1130.143~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial Fixed in 4.4.0-229.263~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- linux Fixed in 4.4.0-229.263Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws Fixed in 4.4.0-1145.160Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-aws-hwe Fixed in 4.15.0-1119.126~16.04.2Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1130.143~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1115.129~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-167.175~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-kvm Fixed in 4.4.0-1110.120Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 4.15.0-1086.94~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 16.04 LTS
- linux-fips Fixed in 4.4.0-1079.86Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2060.62Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2042.46Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1076.85Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2025.27Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1069.73+fips2Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1073.76+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1041.47Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1067.71~20.04.1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 16.04 LTS
- linux-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 18.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 20.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.