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CVE-2026-74634

Unknown

Last modified

CVE-2026-74634 is a vulnerability of currently unknown severity. 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..

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f9b94daa542a8d2532f0930f01cd9aec2d19621b, < b45b91db41379ee5fb36c187d6d7c37b725cbe8e; >= f9b94daa542a8d2532f0930f01cd9aec2d19621b, < 62978cf6347972c04130e4e841ba404504d92b32; >= f9b94daa542a8d2532f0930f01cd9aec2d19621b, < 7568e9e717e7540bd05bcc007f5d76fcaff3cdff; >= f9b94daa542a8d2532f0930f01cd9aec2d19621b, < bf98d7b0d5a99991e47e66cee4eb1d3fa514be97
LinuxLinux6.8

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74634?
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.
How severe is CVE-2026-74634?
Severity scoring for CVE-2026-74634 is pending analysis.
How do I fix CVE-2026-74634?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST