CVE-2022-4744 — A double-free flaw was found in the Linux kernel’s TUN/TAP device driver functio
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
Published
2023-03-30T00:00:00.000Z
Last modified
2025-02-14T15:45:30.671Z
01What is this vulnerability?
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.
02Affected products
| Vendor | Product | Versions |
|---|
| n | a / Kernel | Linux kernel 5.16-rc7 |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-03-30T00:00:00.000Z
- Last modified: 2025-02-14T15:45:30.671Z
09References
- git.kernel.org — https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=158b51…
- packetstormsecurity.com — http://packetstormsecurity.com/files/171912/CentOS-Stream-9-Missing-Kernel-Secur…
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- security.netapp.com — https://security.netapp.com/advisory/ntap-20230526-0009/
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