🛡️ CVE-2022-50506 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

drbd: only clone bio if we have a backing device

In the Linux kernel, the following vulnerability has been resolved:

drbd: only clone bio if we have a backing device

Commit c347a787e34cb (drbd: set ->bi_bdev in drbd_req_new) moved a

bio_set_dev call (which has since been removed) to "earlier", from

drbd_request_prepare to drbd_req_new.

The problem is that this accesses device->ldev->backing_bdev, which is

not NULL-checked at this point. When we don't have an ldev (i.e. when

the DRBD device is diskless), this leads to a null pointer deref.

So, only allocate the private_bio if we actually have a disk. This is

also a small optimization, since we don't clone the bio to only to

immediately free it again in the diskless case.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2022-50506 is recorded against 2 packages.

  • kernel (from 5.18.0 up to 6.0.6)
  • linux-kernel

Timeline and source

Published on 4 October 2025 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2022-50506 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-10-04
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 5.18.0 6.0.6
linux-kernel — —

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