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Back to active CVEs
High · CVSS 7.8CVE-2026-89501

ring-buffer: Hold cpu_buffer::lock when resizing a subbufCVE-2026-89501

Answer in brief

CVE-2026-89501 records a High severity (CVSS 7.8) vulnerability in ring-buffer: Hold cpu_buffer::lock when resizing a subbuf. 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 Sep 11, 2026Updated Oct 19, 2026Source checked Oct 27, 2026First seen by HOL Sep 11, 2026Material review Oct 19, 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>=8e7b58c27b3c567316a51079b375b846f9223bba <8a496aaa3da6e8d545896c2370c7e617cc931ae2 || >=8e7b58c27b3c567316a51079b375b846f9223bba <6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2 || >=8e7b58c27b3c567316a51079b375b846f9223bba <bf242baf58de03467f226c8e29554c9495dca7fc || >=8e7b58c27b3c567316a51079b375b846f9223bba <24974bd0da1b47fd56c975533ead50abf754e74d8a496aaa3da6e8d545896c2370c7e617cc931ae2, 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2, bf242baf58de03467f226c8e29554c9495dca7fc, 24974bd0da1b47fd56c975533ead50abf754e74d
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 8a496aaa3da6e8d545896c2370c7e617cc931ae2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 11, 2026

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

  2. Source modified

    Oct 19, 2026

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

  3. First seen by HOL

    Sep 11, 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: Hold cpu_buffer::lock when resizing a subbuf Because, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page, hold cpu_buffer->lock to prevent races with ring_buffer_alloc_read_page() and ring_buffer_free_read_page().

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 27, 2026
References
4 linked sources
Open source record