CVE-2023-52439

High

In the Linux kernel, the following vulnerability has been resolved: uio: Fix use-after-free in uio_open core-1 core-2 ------------------------------------------------------- uio_unregister_device uio_open idev = idr_find() device_unregister(&idev->dev) put_device(&idev->dev) uio_device_release get_device(&idev->dev) kfree(idev) uio_free_minor(minor) uio_release put_device(&idev->dev) kfree(idev) ------------------------------------------------------- In the core-1 uio_unregister_device(), the device_unregister will kfree idev when the idev->dev kobject ref is 1. But after core-1 device_unregister, put_device and before doing kfree, the core-2 may get_device. Then: 1. After core-1 kfree idev, the core-2 will do use-after-free for idev. 2. When core-2 do uio_release and put_device, the idev will be double freed. To address this issue, we can get idev atomic & inc idev reference with minor_lock.

Package Linux Kernel
Published 2024-02-20
Last modified 2024-12-27
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.8

out of 10
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-415

CVE-2023-52439 is classified as CWE-415

See CWE-415 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.14.100, 4.18 and later are affected. Fixed in 4.19.306, 5.4.268, 5.10.209, 5.15.148, 6.1.74, 6.6.13, 6.7.1, 6.8 and their respective stable series.

Affected from
≥ 4.14.100 ≥ 4.18
Fixed in
✓ 4.19.306 4.19.x ✓ 5.4.268 5.4.x ✓ 5.10.209 5.10.x ✓ 5.15.148 5.15.x ✓ 6.1.74 6.1.x ✓ 6.6.13 6.6.x ✓ 6.7.1 6.7.x ✓ 6.8

References

11 total
Showing 5 of 11 references View all on NVD

Frequently asked questions

  • What is CVE-2023-52439?

    CVE-2023-52439 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.14.100 onward and has been patched in 4.19.306, 5.4.268, 5.10.209 and others. CVE-2023-52439 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2023-52439?

    CVE-2023-52439 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2023-52439?

    Yes. CVE-2023-52439 has been patched. Fixed versions include 4.19.306, 5.4.268, 5.10.209 and others. If you are running Linux kernel 4.14.100 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2023-52439 actively exploited?

    No. CVE-2023-52439 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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