CVE-2023-53111

HighCVSS 7.8/10Last modified Oct 30, 2026

Description

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

loop: Fix use-after-free issues

do_req_filebacked() calls blk_mq_complete_request() synchronously or asynchronously when using asynchronous I/O unless memory allocation fails. Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor 'rq' after do_req_filebacked() finished unless we are sure that the request has not yet been completed. This patch fixes the following kernel crash:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054 Call trace: css_put.42938+0x1c/0x1ac loop_process_work+0xc8c/0xfd4 loop_rootcg_workfn+0x24/0x34 process_one_work+0x244/0x558 worker_thread+0x400/0x8fc kthread+0x16c/0x1e0 ret_from_fork+0x10/0x20

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
LinuxLinux>= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6, < 81bf9d78fa246a166619196ff5005430ed2bc7c2; >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6, < 407badf73ec9fb0d5744bf2ca1745c1818aa222f; >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6, < e3fda704903f6d1fc351412f1bc6620333959ada; >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6, < 6917395c4667cfb607ed8bf1826205a59414657c; >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6, < 9b0cb770f5d7b1ff40bea7ca385438ee94570eec
LinuxLinux4.4

References

Timeline

Published
May 2, 2025
Last modified
Oct 30, 2026
NVD status
Modified

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CVE-2023-53111: High severity, CVSS 7.8 | Vulnix