7.8

CVE-2022-49085

drbd: Fix five use after free bugs in get_initial_state

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/
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.311
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.276
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.238
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.189
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.111
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.34
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.20
Linux ≫ Linux Kernel Version >= 5.17 < 5.17.3
Linux ≫ Linux Kernel Version5.18 Updaterc1
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.27% 0.185
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103
Patch
https://git.kernel.org/stable/c/188fe6b26765edbad4055611c0f788b6870f4024
Patch
https://git.kernel.org/stable/c/226e993c39405292781bfcf4b039a8db56aab362
Patch
https://git.kernel.org/stable/c/594205b4936771a250f9d141e7e0fff21c3dd2d9
Patch
https://git.kernel.org/stable/c/a972c768723359ec995579902473028fe3cd64b1
Patch
https://git.kernel.org/stable/c/aadb22ba2f656581b2f733deb3a467c48cc618f6
Patch
https://git.kernel.org/stable/c/b6a4055036eed1f5e239ce3d8b0db1ce38bba447
Patch
https://git.kernel.org/stable/c/dcf6be17b5c53b741898d2223b23e66d682de300
Patch
https://git.kernel.org/stable/c/de63e74da2333b4068bb79983e632db730fea97e
Patch