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VULNERABILITIES

CVE-2026-89503 Details

Description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page() ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again. However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory. Use bpage->order for the allocation to prevent this race.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: kernel.orgCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://git.kernel.org/stable/c/2dc510957fe8fd098ab3c3147ebdf34d00cd2734 kernel.org
https://git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678 kernel.org
https://git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 kernel.org

Weakness Enumeration

No weakness enumeration is available for this CVE.

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-89503
NVD Published Date:
Sep 11, 2026
NVD Last Modified:
Sep 13, 2026
Source:
kernel.org
CVE-2026-89503 Details - Not Deferred