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CVE-2026-89501

ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

HIGH
7.8
CVSS Score
Published: September 11, 2026 at 07:43 PM UTC
Updated: October 19, 2026 at 09:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%

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().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
6.88e7b58c27b3c567316a51079b375b846f9223bba
Vendor states this is fixed in 24974bd0da1b47fd56c975533ead50abf754e74d (fixed)
Vendor states this is fixed in 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2 (fixed)
Vendor states this is fixed in 8a496aaa3da6e8d545896c2370c7e617cc931ae2 (fixed)
Vendor states this is fixed in bf242baf58de03467f226c8e29554c9495dca7fc (fixed)
Vendor states this is fixed in 6.12.109 (unaffected)
Vendor states this is fixed in 6.18.50 (unaffected)
Vendor states this is fixed in 6.8 (unaffected)
Vendor states this is fixed in 7.2.4 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord
https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2
Source: cverecord
https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2
Source: cverecord
https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc
Source: cverecord
https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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