Review reviewHigh

CVE-2023-52837

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: nbd: fix uaf in nbd_open Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set disk->private_data as NULL as before. UAF may be triggered in nbd_open() if someone tries to open nbd device right after nbd_put() since nbd has been free in nbd_dev_remove(). Fix this by implementing ->free_disk and free private data in it.

CVSS: 7.8
EPSS: 0.25%
CISA KEV: Not listed
Published: 2024.05.22

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.25%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux Linux, linux kernel
Affected versions: >= 4af5f2e0301311f88c420fcfc5f3c8611ade20ac < 4e9b3ec84dc97909876641dad14e0a2300d6c2a3, >= 4af5f2e0301311f88c420fcfc5f3c8611ade20ac < 879947f4180bc6e83af64eb0515e0cf57fce15db, >= 4af5f2e0301311f88c420fcfc5f3c8611ade20ac < 56bd7901b5e9dbc9112036ea615ebcba1565fafe, >= 4af5f2e0301311f88c420fcfc5f3c8611ade20ac < 327462725b0f759f093788dfbcb2f1fd132f956b, >= 5.14, >= 5.14 < 6.1.63, >= 6.2 < 6.5.12, >= 6.6 < 6.6.2
Fixed versions: 6.1.63, 6.5.12, 6.6.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Linux, linux kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416