CVE-2023-53111

HIGH

MEDIUM Priority: 0.02 BB Relevance: 41/100

Published: 2025-05-02 Modified: 2026-10-30 First seen: 2026-10-30 Status: active

Attack Surface

Low Complexity No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: High

I: High

A: High

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

Weakness Classification (1)

CWE-416

Affected Software (9)

Vendor	Product	Version
Linux	Linux	bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 81bf9d78fa246a166619196ff5005430ed2bc7c2
Linux	Linux	bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 407badf73ec9fb0d5744bf2ca1745c1818aa222f
Linux	Linux	bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < e3fda704903f6d1fc351412f1bc6620333959ada
Linux	Linux	bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 6917395c4667cfb607ed8bf1826205a59414657c
Linux	Linux	bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 9b0cb770f5d7b1ff40bea7ca385438ee94570eec
Linux	Linux	4.4
linux	linux_kernel	4.4 – 5.15.104
linux	linux_kernel	6.3
linux	linux_kernel	6.3