CVE-2022-49085: drbd: Fix five use after free bugs in get_initial_state
First published: Wed Feb 26 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: drbd: Fix five use after free bugs in get_initial_state In get_initial_state, it calls notify_initial_state_done(skb,..) if cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(), the skb will be freed by nlmsg_free(skb). Then get_initial_state will goto out and the freed skb will be used by return value skb->len, which is a uaf bug. What's worse, the same problem goes even further: skb can also be freed in the notify_*_state_change -> notify_*_state calls below. Thus 4 additional uaf bugs happened. My patch lets the problem callee functions: notify_initial_state_done and notify_*_state_change return an error code if errors happen. So that the error codes could be propagated and the uaf bugs can be avoid. v2 reports a compilation warning. This v3 fixed this warning and built successfully in my local environment with no additional warnings. v2: https://lore.kernel.org/patchwork/patch/1435218/
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| DRBD | ||
| Linux Kernel | >=4.5<4.9.311 | |
| Linux Kernel | >=4.10<4.14.276 | |
| Linux Kernel | >=4.15<4.19.238 | |
| Linux Kernel | >=4.20<5.4.189 | |
| Linux Kernel | >=5.5<5.10.111 | |
| Linux Kernel | >=5.11<5.15.34 | |
| Linux Kernel | >=5.16<5.16.20 | |
| Linux Kernel | >=5.17<5.17.3 | |
| Linux Kernel | =5.18-rc1 |
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Reference Links
- https://git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103
- https://git.kernel.org/stable/c/dcf6be17b5c53b741898d2223b23e66d682de300
- https://git.kernel.org/stable/c/188fe6b26765edbad4055611c0f788b6870f4024
- https://git.kernel.org/stable/c/b6a4055036eed1f5e239ce3d8b0db1ce38bba447
- https://git.kernel.org/stable/c/594205b4936771a250f9d141e7e0fff21c3dd2d9
- https://git.kernel.org/stable/c/a972c768723359ec995579902473028fe3cd64b1
- https://git.kernel.org/stable/c/de63e74da2333b4068bb79983e632db730fea97e
- https://git.kernel.org/stable/c/226e993c39405292781bfcf4b039a8db56aab362
- https://git.kernel.org/stable/c/aadb22ba2f656581b2f733deb3a467c48cc618f6
Frequently Asked Questions
What is the severity of CVE-2022-49085?
CVE-2022-49085 is classified as a use-after-free vulnerability which can lead to denial of service or potential code execution.
How do I fix CVE-2022-49085?
To fix CVE-2022-49085, you should update your Linux kernel to a version that includes the security patch addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2022-49085?
CVE-2022-49085 affects Linux kernel versions prior to 5.18-rc1, specifically versions from 4.5 up to 5.17.3.
What are the potential impacts of CVE-2022-49085?
The potential impacts of CVE-2022-49085 include system crashes, denial of service, and possible remote code execution.
Where can I find more information on CVE-2022-49085?
More information about CVE-2022-49085 can be found in Linux kernel security advisory notices and related technical documentation.
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