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Back to active CVEs
High · CVSS 7.8CVE-2026-74634

ring-buffer: Prevent subbuf order change when resizing is disabledCVE-2026-74634

Answer in brief

CVE-2026-74634 records a High severity (CVSS 7.8) vulnerability in ring-buffer: Prevent subbuf order change when resizing is disabled. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 22, 2026Updated Aug 25, 2026Source checked Oct 7, 2026First seen by HOL Aug 22, 2026Material review Aug 25, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=f9b94daa542a8d2532f0930f01cd9aec2d19621b <b45b91db41379ee5fb36c187d6d7c37b725cbe8e || >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <62978cf6347972c04130e4e841ba404504d92b32 || >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <7568e9e717e7540bd05bcc007f5d76fcaff3cdff || >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <bf98d7b0d5a99991e47e66cee4eb1d3fa514be97b45b91db41379ee5fb36c187d6d7c37b725cbe8e, 62978cf6347972c04130e4e841ba404504d92b32, 7568e9e717e7540bd05bcc007f5d76fcaff3cdff, bf98d7b0d5a99991e47e66cee4eb1d3fa514be97
Linux/Linuxgeneric6.8Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to b45b91db41379ee5fb36c187d6d7c37b725cbe8e if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 22, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 7, 2026
References
4 linked sources
Open source record