CVE-2024-40913

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

12/07/2024

Last modified:

03/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: defer exposing anon_fd until after copy_to_user() succeeds After installing the anonymous fd, we can now see it in userland and close it. However, at this point we may not have gotten the reference count of the cache, but we will put it during colse fd, so this may cause a cache UAF. So grab the cache reference count before fd_install(). In addition, by kernel convention, fd is taken over by the user land after fd_install(), and the kernel should not call close_fd() after that, i.e., it should call fd_install() after everything is ready, thus fd_install() is called after copy_to_user() succeeds.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	5.19 (including)	6.1.95 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.35 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.9.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.10:rc1::::::
cpe:2.3:o:linux:linux_kernel:6.10:rc2::::::
cpe:2.3:o:linux:linux_kernel:6.10:rc3::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2024-40913

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools