CVE-2022-50506
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-04

Last updated on: 2026-03-25

Assigner: kernel.org

Description
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.
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Meta Information
Published
2025-10-04
Last Modified
2026-03-25
Generated
2026-06-16
AI Q&A
2025-10-04
EPSS Evaluated
2026-06-15
NVD
CVE-2022-50506
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.1
linux linux_kernel From 5.18 (inc) to 6.0.6 (inc)
linux kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability in the Linux kernel's DRBD component occurs because the code accesses a backing device pointer without checking if it is NULL. Specifically, when the DRBD device is diskless (has no backing device), the code attempts to clone a bio structure without verifying the presence of a backing device, leading to a null pointer dereference. The fix ensures that the bio is only cloned if a backing device exists, preventing this null pointer dereference and optimizing resource usage.

Impact Analysis

This vulnerability can cause a null pointer dereference in the Linux kernel's DRBD module, which may lead to a kernel crash or system instability when the DRBD device is diskless. This can result in denial of service or unexpected system behavior.

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