CVE-2022-49085

HIGH EPSS 17.6%
Published Feb 26, 20251y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
17.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥4.5  –  <4.9.311
linuxlinux_kernel*≥4.10  –  <4.14.276
linuxlinux_kernel*≥4.15  –  <4.19.238
linuxlinux_kernel*≥4.20  –  <5.4.189
linuxlinux_kernel*≥5.5  –  <5.10.111
linuxlinux_kernel*≥5.11  –  <5.15.34
linuxlinux_kernel*≥5.16  –  <5.16.20
linuxlinux_kernel*≥5.17  –  <5.17.3
linuxlinux_kernel5.18any

References 9

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

Remediation

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