What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-14

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 products

• Linux kernel: 6.8 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

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

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