Home/CVE/hso_free_net_device in drivers/net/usb/hso.c in the Linux kernel through 5.13.4 calls unregister_netdev without checking
CVE

CVE-2021-37159

hso_free_net_device in drivers/net/usb/hso.c in the Linux kernel through 5.13.4 calls unregister_netdev without checking

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.

MEDIUM · CVSS 6.4 EPSS 0.00034
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-415Double Free
CWE-416Use After Free
▤

Affected Products & Versions

5
linux kernel<= 5.13.4
debian linuxall versions
oracle communications cloud native core binding support functionall versions
oracle communications cloud native core network exposure functionall versions
oracle communications cloud native core policyall versions
▣

Scoring & Timeline

6.4
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 Jul 2021 · 03:16 PM
CVSS VectorCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

30
rhsaRHSA-2022:1988Low
suse-csafSUSE-SU-2025:0834-1
usnUSN-6971-1
rhsaRHSA-2022:1975Moderate
usnUSN-5361-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.htmlMailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210819-0003/Third Party Advisory
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