High severity · published Sep 11, 2026
CVE-2026-89501
ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
7.8
CVSS
0.2%
EPSS
No
On KEV
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().
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
8e7b58c27b3c567316a51079b375b846f9223bba before 8a496aaa3da6e8d545896c2370c7e617cc931ae2; 8e7b58c27b3c567316a51079b375b846f9223bba before 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2; 8e7b58c27b3c567316a51079b375b846f9223bba before bf242baf58de03467f226c8e29554c9495dca7fc; 8e7b58c27b3c567316a51079b375b846f9223bba before 24974bd0da1b47fd56c975533ead50abf754e74d; 6.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89501
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89501
git.kernel.org
https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d
git.kernel.org
https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2
git.kernel.org
https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2
git.kernel.org
https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc
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