CVE-2022-4744

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-03-30 · updated 2026-06-17
Weakness: CWE-460

Description

A double-free flaw was found in the Linux kernel’s TUN/TAP device driver functionality in how a user registers the device when the register_netdevice function fails (NETDEV_REGISTER notifier). This flaw allows a local user to crash or potentially escalate their privileges on the system.

Affected products

Linux kernel: from 5.5 before 5.10.136; from 5.11 before 5.15.12 — fixed in 5.10.136, 5.15.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.136, 5.15.12. Check the vendor advisory for mitigations.

References

http://packetstormsecurity.com/files/171912/CentOS-Stream-9-Missing-Kernel-Security-Fix.html
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=158b515f703e
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
https://security.netapp.com/advisory/ntap-20230526-0009/
http://packetstormsecurity.com/files/171912/CentOS-Stream-9-Missing-Kernel-Security-Fix.html
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=158b515f703e
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
https://security.netapp.com/advisory/ntap-20230526-0009/

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