CVE intelligence and bounded remediation

CVE-2021-37159 — Linux Linux Kernel security vulnerability

Medium CVSS 6.4

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.

Severity
Medium
CVSS
6.4 (3.1)
Published
2021-07-21
CISA KEV
Not currently listed
Ecosystem
linux/kernel
Weaknesses
CWE-415, CWE-416

Affected products

  • linux / linux_kernel
  • debian / debian_linux / 9.0
  • oracle / communications_cloud_native_core_binding_support_function / 22.1.3
  • oracle / communications_cloud_native_core_network_exposure_function / 22.1.1
  • oracle / communications_cloud_native_core_policy / 22.2.0

Matched remediation archetype

Buffer bounds, memory safety, and memory corruption

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Check exposure

  • Identify affected native-code versions, build flags, architectures, parsers, codecs, drivers, and input paths in all shipped artifacts.
  • Determine whether untrusted data reaches the affected routine and the process privilege, sandbox, and network exposure.
  • Confirm statically linked, vendored, firmware, and platform-provided copies, not only package-manager records.

Remediate safely

  • Apply the maintained upstream correction or replace the affected component, then rebuild every dependent artifact from clean inputs.
  • Adopt bounds-checked interfaces, validated sizes and integer conversions, clear ownership, and memory-safe components where practical.
  • Enable supported compiler and runtime hardening and add sanitized tests and fuzz regression seeds derived from non-weaponized fixtures.

Authoritative sources

Complete CVE record and remediation plan

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