High 7.8Published Aug 22, 2026

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

Updated under an hour ago (Oct 27, 2026, 9:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f9b94daa542a8d2532f0930f01cd9aec2d19621b before b45b91db41379ee5fb36c187d6d7c37b725cbe8e; from f9b94daa542a8d2532f0930f01cd9aec2d19621b before 62978cf6347972c04130e4e841ba404504d92b32; from f9b94daa542a8d2532f0930f01cd9aec2d19621b before 7568e9e717e7540bd05bcc007f5d76fcaff3cdff; from f9b94daa542a8d2532f0930f01cd9aec2d19621b before bf98d7b0d5a99991e47e66cee4eb1d3fa514be97	CNA record

References

References

https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e
https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32
https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff
https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.