Answer in brief
CVE-2023-52837 records a High severity (CVSS 7.8) vulnerability in nbd: fix uaf in nbd_open. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <4e9b3ec84dc97909876641dad14e0a2300d6c2a3 || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <879947f4180bc6e83af64eb0515e0cf57fce15db || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <56bd7901b5e9dbc9112036ea615ebcba1565fafe || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <327462725b0f759f093788dfbcb2f1fd132f956b | 4e9b3ec84dc97909876641dad14e0a2300d6c2a3, 879947f4180bc6e83af64eb0515e0cf57fce15db, 56bd7901b5e9dbc9112036ea615ebcba1565fafe, 327462725b0f759f093788dfbcb2f1fd132f956b |
| Linux/Linuxgeneric | 5.14 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2023-52837 records a High severity (CVSS 7.8) vulnerability in nbd: fix uaf in nbd_open. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <4e9b3ec84dc97909876641dad14e0a2300d6c2a3 || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <879947f4180bc6e83af64eb0515e0cf57fce15db || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <56bd7901b5e9dbc9112036ea615ebcba1565fafe || >=4af5f2e0301311f88c420fcfc5f3c8611ade20ac <327462725b0f759f093788dfbcb2f1fd132f956b | 4e9b3ec84dc97909876641dad14e0a2300d6c2a3, 879947f4180bc6e83af64eb0515e0cf57fce15db, 56bd7901b5e9dbc9112036ea615ebcba1565fafe, 327462725b0f759f093788dfbcb2f1fd132f956b |
| Linux/Linuxgeneric | 5.14 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.