In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/12064e1880fc9202be75ff668205b1703d92f74f cve-icon cve-icon
https://git.kernel.org/stable/c/3b114a3282ab1a12cb4618a8f45db5d7185e784a cve-icon cve-icon
https://git.kernel.org/stable/c/64db338140d2bad99a0a8c6a118dd60b3e1fb8cb cve-icon cve-icon
https://git.kernel.org/stable/c/a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309 cve-icon cve-icon
https://git.kernel.org/stable/c/bfb336cf97df7b37b2b2edec0f69773e06d11955 cve-icon cve-icon
https://git.kernel.org/stable/c/c4cd93811e038d19f961985735ef7bb128078dfb cve-icon cve-icon
https://git.kernel.org/stable/c/c591ba1acd081d4980713e47869dd1cc3d963d19 cve-icon cve-icon
https://git.kernel.org/stable/c/e0b6b223167e1edde5c82edf38e393c06eda1f13 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025090546-CVE-2025-39689-f538@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-39689 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-39689 cve-icon
History

Sat, 06 Sep 2025 09:15:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Sat, 06 Sep 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Fri, 05 Sep 2025 17:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: ftrace: Also allocate and copy hash for reading of filter files Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds the pointer to the global tracer hash to its iterator. Unlike the writer that allocates a copy of the hash, the reader keeps the pointer to the filter hashes. This is problematic because this pointer is static across function calls that release the locks that can update the global tracer hashes. This can cause UAF and similar bugs. Allocate and copy the hash for reading the filter files like it is done for the writers. This not only fixes UAF bugs, but also makes the code a bit simpler as it doesn't have to differentiate when to free the iterator's hash between writers and readers.
Title ftrace: Also allocate and copy hash for reading of filter files
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-09-05T17:20:55.270Z

Updated: 2025-09-05T17:20:55.270Z

Reserved: 2025-04-16T07:20:57.113Z

Link: CVE-2025-39689

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-09-05T18:15:45.573

Modified: 2025-09-08T16:25:38.810

Link: CVE-2025-39689

cve-icon Redhat

Severity : Important

Publid Date: 2025-09-05T00:00:00Z

Links: CVE-2025-39689 - Bugzilla