What’s Vulnerable › Vulnerabilities

CVE-2026-74602: ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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: Initialise reader page order in rb_allocate_cpu_buffer() In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order).

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/2e37f2bf111429fbfa4d985b12df3ba496ca70aa
• https://git.kernel.org/stable/c/3b3e0a6ee5bb3ac000f135beef26b2b7ed1a771a
• https://git.kernel.org/stable/c/6d014e44b68ddd43f71288d2a4dbb1a259869149
• https://git.kernel.org/stable/c/7c620d89bae1a926ab7d626600285d3516c9f3c4

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