CVE-2025-39689
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-05

Last updated on: 2025-11-03

Assigner: kernel.org

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-09-05
Last Modified
2025-11-03
Generated
2026-05-07
AI Q&A
2025-09-05
EPSS Evaluated
2026-05-05
NVD
CVE-2025-39689
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.1.153-1
linux linux_kernel 5.10.244-1
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability in the Linux kernel involves the handling of filter files in the ftrace subsystem. Specifically, when reading the set_ftrace_filter and set_ftrace_notrace files, the reader uses a pointer to a global tracer hash without making a copy. Since this pointer remains static across function calls that release locks allowing updates to the global tracer hashes, it can lead to use-after-free (UAF) and similar bugs. The fix involves allocating and copying the hash for reading filter files, similar to how writers handle it, preventing UAF issues and simplifying the code.


How can this vulnerability impact me? :

This vulnerability can lead to use-after-free bugs in the Linux kernel's ftrace subsystem, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or escalate privileges by exploiting the improper handling of filter hashes.


Ask Our AI Assistant
Need more information? Ask your question to get an AI reply (Powered by our expertise)
0/70
EPSS Chart