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Review reviewHigh

CVE-2023-53111

Linux Linux, linux kernel

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_p...

CVSS
7.8
EPSS
0.19%
9.23% percentile
CISA KEV
Not listed
Published
2025.05.03
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7.8

Vulnerability overview

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_p...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 407badf73ec9fb0d5744bf2ca1745c1818aa222f, >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < e3fda704903f6d1fc351412f1bc6620333959ada, >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 6917395c4667cfb607ed8bf1826205a59414657c, >= bc07c10a3603a5ab3ef01ba42b3d41f9ac63d1b6 < 9b0cb770f5d7b1ff40bea7ca385438ee94570eec, >= 4.4, >= 4.4 < 5.15.104, >= 5.16 < 6.1.21, >= 6.2 < 6.2.8, 6.3
Fixed versions
5.15.104, 6.1.21, 6.2.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 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
CVE-2023-53111 — Linux Linux, linux kernel | SECUFOCUS NOW