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TI-2021-02514 Aliases CVE-2021-3564GHSA-x4rf-jx7j-r49m

Double free in kernel

Priority LOW 25CWE-415Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 13 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

A flaw double-free memory corruption in the Linux kernel HCI device initialization subsystem was found in the way user attach malicious HCI TTY Bluetooth device. A local user could use this flaw to crash the system. This flaw affects all the Linux kernel versions starting from 3.13.

Why it matters now

EPSS 0.00485 42nd percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix Partial Red Hat: 4 advisoriesRed Hat: 13 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—kernelAll Linux kernel versions starting from 3.13—No fix listedCNA
  • kernel Vendor— Affected All Linux kernel versions starting from 3.13 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*3.13VulnerableLinux
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.13 Vulnerable ·Linux
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian

Remediation

Red Hat 4 advisories

  • RHSA-2022:0620 Released 2022-02-22 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1160.59.1.el7, kernel-3.10.0-1160.59.1.el7, kernel-abi-whitelists-3.10.0-1160.59.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.59.1.el7
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.59.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1160.59.1.el7, kernel-3.10.0-1160.59.1.el7, kernel-abi-whitelists-3.10.0-1160.59.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1160.59.1.el7, kernel-tools-libs-devel-3.10.0-1160.59.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1160.59.1.el7, kernel-3.10.0-1160.59.1.el7, kernel-abi-whitelists-3.10.0-1160.59.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1160.59.1.el7
  • RHSA-2022:0622 Released 2022-02-22 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt-3.10.0-1160.59.1.rt56.1200.el7, kernel-rt-debug-3.10.0-1160.59.1.rt56.1200.el7, kernel-rt-debug-devel-3.10.0-1160.59.1.rt56.1200.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1160.59.1.rt56.1200.el7, kernel-rt-debug-3.10.0-1160.59.1.rt56.1200.el7, kernel-rt-debug-devel-3.10.0-1160.59.1.rt56.1200.el7 +7
  • RHSA-2021:4356 Released 2021-11-09 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-348.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-348.el8, kernel-4.18.0-348.el8, kernel-abi-stablelists-4.18.0-348.el8 +19
Show 1 more Red Hat advisories
  • RHSA-2021:4140 Released 2021-11-09 · Red Hat rating Moderate
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:4356
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:4356
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:4140
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:4140
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:0620
Red Hat Enterprise Linux for Real Time (v. 7)Fixed RHSA-2022:0622
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2022:0622
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3564
  2. 2026-10-03 Alias added: GHSA-x4rf-jx7j-r49m

References

Exploit 3

Advisory 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences