Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-37159

CVE-2021-37159MEDIUM

n/a n/a — 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_R…

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   P   H   N   N  U  H  H  H    6.4   .0039   31.7     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jul 21  Reserved by mitre
  Jul 21  Published (CNA: mitre)
  Oct 8   ENRICHED — CVE-2021-37159. Received CVSS 6.4 and CPE data from NVD.

CWE-415, CWE-416 · CNA: mitre · CVSS v3.1 · 8 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 21, 2021	Reserved	Reserved by mitre
July 21, 2021	Published	Published (CNA: mitre)
October 8, 2026	ENRICHED	ENRICHED — CVE-2021-37159. Received CVSS 6.4 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-415 · CWE-416

References (8)

https://bugzilla.suse.com/show_bug.cgi?id=1188601
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a6ecfb39ba9d7316057cea823b196b734f6b18ca
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dcb713d53e2eadf42b878c12a471e74dc6ed3145
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html [Mailing List, Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210819-0003/ [Third Party Advisory]
https://www.oracle.com/security-alerts/cpujul2022.html [Patch, Third Party Advisory]
https://www.spinics.net/lists/linux-usb/msg202228.html [Mailing List, Patch, Third Party Advisory]

Authoritative record: CVE-2021-37159 at cve.org

Weaknesses: CWE-415 · CWE-416

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-37159 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.