CVE-2022-4744: Double Free
First published: Mon Dec 26 2022(Updated: )
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.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:5.14.0-162.22.2.el9_1 | 0:5.14.0-162.22.2.el9_1 |
| redhat/kernel-rt | <0:5.14.0-162.22.2.rt21.186.el9_1 | 0:5.14.0-162.22.2.rt21.186.el9_1 |
| redhat/kernel | <0:5.14.0-70.50.2.el9_0 | 0:5.14.0-70.50.2.el9_0 |
| redhat/kernel-rt | <0:5.14.0-70.50.2.rt21.122.el9_0 | 0:5.14.0-70.50.2.rt21.122.el9_0 |
| redhat/kernel | <5.16 | 5.16 |
| Linux Kernel | >=5.5<5.10.136 | |
| Linux Kernel | >=5.11<5.15.12 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager | <=ISVG 10.0.2 |
Remedy
To mitigate this issue, prevent the tun module from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2022-4744 https://nvd.nist.gov/vuln/detail/CVE-2022-4744 https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=158b515f703e
- https://bugzilla.redhat.com/show_bug.cgi?id=2156322
- https://access.redhat.com/errata/RHSA-2023:1470
- https://access.redhat.com/errata/RHSA-2023:1469
- https://access.redhat.com/errata/RHSA-2023:1471
- https://access.redhat.com/errata/RHSA-2023:1468
- https://access.redhat.com/errata/RHSA-2023:1467
- https://access.redhat.com/errata/RHSA-2023:1466
- https://access.redhat.com/security/cve/cve-2022-4744
- 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/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2180939
- https://access.redhat.com/errata/RHSA-2023:6901
- https://access.redhat.com/errata/RHSA-2023:7077
- https://access.redhat.com/errata/RHSA-2024:1404
- https://www.ibm.com/support/pages/node/7172423 (Advisory)
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2022-4744?
CVE-2022-4744 is categorized as a high severity vulnerability due to its potential to allow privilege escalation.
How do I fix CVE-2022-4744?
To fix CVE-2022-4744, you should update your Linux kernel to one of the remedied versions listed by Red Hat, such as 0:5.14.0-162.22.2.el9_1 or higher.
Who is affected by CVE-2022-4744?
CVE-2022-4744 affects Linux kernels and certain IBM Security Verify Governance versions, making users of these systems potentially vulnerable.
What kind of attack can CVE-2022-4744 enable?
CVE-2022-4744 can enable a local user to crash the system or escalate their privileges.
Is CVE-2022-4744 specific to certain Linux distributions?
Yes, CVE-2022-4744 primarily affects Red Hat-based distributions, including those using the kernel and kernel-rt packages.
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