TI-2021-15225 Aliases CVE-2021-37159 GHSA-jh5h-88qq-m547

hso_free_net_device in drivers/net/usb/hso.c in the Linux kernel through 5.13.4 calls…

LOW 31CWE-415Published 2021-07-21 · Updated 2026-10-08

Key facts

Attack vector: Physical
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 4 fixed, 3 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

hso_free_net_device in drivers/net/usb/hso.c in the Linux kernel through 5.13.4 calls unregister_netdev without checking for the NETREG_REGISTERED state, leading to a use-after-free and a double free.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00391 33rd percentileScored 2026-11-07

Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	up to 5.13.4	Vulnerable	Linux
cpe:2.3:o:debian:debian_linux:9.0:::::::*	9.0	Vulnerable	Debian
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:::::::*	22.1.3	Vulnerable	Oracle
cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:::::::*	22.1.1	Vulnerable	Oracle
cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:::::::*	22.2.0	Vulnerable	Oracle

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions up to 5.13.4 Vulnerable ·Linux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:22.1.3:*:*:*:*:*:*:* Versions 22.1.3 Vulnerable ·Oracle
cpe:2.3:a:oracle:communications_cloud_native_core_network_exposure_function:22.1.1:*:*:*:*:*:*:* Versions 22.1.1 Vulnerable ·Oracle
cpe:2.3:a:oracle:communications_cloud_native_core_policy:22.2.0:*:*:*:*:*:*:* Versions 22.2.0 Vulnerable ·Oracle

Remediation

Red Hat 2 advisories

RHSA-2022:1988 Released 2022-05-10 · Red Hat rating Important
kernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-372.9.1.el8, kernel-4.18.0-372.9.1.el8, kernel-abi-stablelists-4.18.0-372.9.1.el8 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-372.9.1.el8
RHSA-2022:1975 Released 2022-05-10 · Red Hat rating Important
kernel-rt security and bug fix update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-372.9.1.rt7.166.el8, kernel-rt-core-4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-4.18.0-372.9.1.rt7.166.el8 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-372.9.1.rt7.166.el8, kernel-rt-core-4.18.0-372.9.1.rt7.166.el8, kernel-rt-debug-4.18.0-372.9.1.rt7.166.el8 +7

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux BaseOS (v. 8)	Fixed	RHSA-2022:1988
Red Hat Enterprise Linux CRB (v. 8)	Fixed	RHSA-2022:1988
Red Hat Enterprise Linux NFV (v. 8)	Fixed	RHSA-2022:1975
Red Hat Enterprise Linux RT (v. 8)	Fixed	RHSA-2022:1975

Timeline

2026-10-02 Threatist record created from CVE-2021-37159
2026-10-03 Alias added: GHSA-jh5h-88qq-m547
2026-10-08 CISA SSVC decision points changed

References

Patch 2

Advisory 3

Other 3

Sources

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