CVE-2022-49085
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.28%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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/
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.28% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103Patch
- https://git.kernel.org/stable/c/188fe6b26765edbad4055611c0f788b6870f4024Patch
- https://git.kernel.org/stable/c/226e993c39405292781bfcf4b039a8db56aab362Patch
- https://git.kernel.org/stable/c/594205b4936771a250f9d141e7e0fff21c3dd2d9Patch
- https://git.kernel.org/stable/c/a972c768723359ec995579902473028fe3cd64b1Patch
- https://git.kernel.org/stable/c/aadb22ba2f656581b2f733deb3a467c48cc618f6Patch
- https://git.kernel.org/stable/c/b6a4055036eed1f5e239ce3d8b0db1ce38bba447Patch
- https://git.kernel.org/stable/c/dcf6be17b5c53b741898d2223b23e66d682de300Patch
- https://git.kernel.org/stable/c/de63e74da2333b4068bb79983e632db730fea97ePatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.