BaseFortify

Publication date: 2025-10-09

Last updated on: 2026-02-26

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix untrusted unsigned subtract Fix the following Smatch static checker warning: net/rxrpc/rxgk_app.c:65 rxgk_yfs_decode_ticket() warn: untrusted unsigned subtract. 'ticket_len - 10 * 4' by prechecking the length of what we're trying to extract in two places in the token and decoding for a response packet. Also use sizeof() on the struct we're extracting rather specifying the size numerically to be consistent with the other related statements.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-09

Last Modified

2026-02-26

Generated

2026-07-06

AI Q&A

2025-10-09

EPSS Evaluated

2026-07-05

NVD

CVE-2025-39962

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	6.17
linux	linux_kernel	From 5.15.160 (inc) to 5.16 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves an untrusted unsigned subtraction in the rxrpc module, specifically in the rxgk_yfs_decode_ticket() function. The issue was a static checker warning about subtracting values without proper validation, which could lead to incorrect memory handling. The fix involved prechecking the length of data before extraction and using sizeof() for consistent size specification.

Impact Analysis

The vulnerability could potentially lead to improper memory handling or processing of data in the Linux kernel's rxrpc module, which might cause unexpected behavior or security issues such as crashes or data corruption. However, specific impacts are not detailed in the provided information.

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