CVE-2023-53111

loop: Fix use-after-free issues

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

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/407badf73ec9fb0d5744bf2ca1745c1818aa222f
https://git.kernel.org/stable/c/e3fda704903f6d1fc351412f1bc6620333959ada
https://git.kernel.org/stable/c/6917395c4667cfb607ed8bf1826205a59414657c
https://git.kernel.org/stable/c/9b0cb770f5d7b1ff40bea7ca385438ee94570eec

Frequently Asked Questions

What is the severity of CVE-2023-53111?: CVE-2023-53111 has not yet been assigned a CVSS score.
How to fix CVE-2023-53111?: To fix CVE-2023-53111, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-53111 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-53111 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-53111?: CVE-2023-53111 affects Linux Linux, Linux Linux.

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