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CVE-2026-74634
ring-buffer: Prevent subbuf order change when resizing is disabled
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Prevent subbuf order change when resizing is disabled Because ring_buffer_subbuf_order_set() frees buffer pages, we can't allow it when resizing is disabled. A non-consuming reader is at risk of use-after-free (rb_advance_iter()). Return -EBUSY on resize_disabled, matching ring_buffer_resize() behaviour.

Details
INFO

Published Date :

Aug. 22, 2026, 4:16 p.m.

Last Modified :

Aug. 22, 2026, 4:16 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-74634 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Update the Linux kernel to fix a use-after-free vulnerability related to ring buffer resizing.
  • Update the Linux kernel to the latest stable version.
  • Apply the specific patch for the ring-buffer fix.
  • Reboot the system after applying the update.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-74634.

URL Resource
https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32
https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff
https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e
https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-74634 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-74634 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-74634 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-74634 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 22, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f9b94daa542a8d2532f0930f01cd9aec2d19621b', 'lessThan': 'b45b91db41379ee5fb36c187d6d7c37b725cbe8e', 'versionType': 'git'}, {'status': 'affected', 'version': 'f9b94daa542a8d2532f0930f01cd9aec2d19621b', 'lessThan': '62978cf6347972c04130e4e841ba404504d92b32', 'versionType': 'git'}, {'status': 'affected', 'version': 'f9b94daa542a8d2532f0930f01cd9aec2d19621b', 'lessThan': '7568e9e717e7540bd05bcc007f5d76fcaff3cdff', 'versionType': 'git'}, {'status': 'affected', 'version': 'f9b94daa542a8d2532f0930f01cd9aec2d19621b', 'lessThan': 'bf98d7b0d5a99991e47e66cee4eb1d3fa514be97', 'versionType': 'git'}], 'programFiles': ['kernel/trace/ring_buffer.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.8'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.8', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.104', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.45', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.9', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['kernel/trace/ring_buffer.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Prevent subbuf order change when resizing is disabled Because ring_buffer_subbuf_order_set() frees buffer pages, we can't allow it when resizing is disabled. A non-consuming reader is at risk of use-after-free (rb_advance_iter()). Return -EBUSY on resize_disabled, matching ring_buffer_resize() behaviour.
    Added Reference https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32
    Added Reference https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff
    Added Reference https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e
    Added Reference https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
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