What’s Vulnerable › Vulnerabilities

CVE-2025-40364: io_uring: fix io_req_prep_async with provided buffers

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-18 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix io_req_prep_async with provided buffers io_req_prep_async() can import provided buffers, commit the ring state by giving up on that before, it'll be reimported later if needed.

Affected products

• Linux kernel: from 5.19 before 6.1.129; from 6.2 before 6.6.78; from 6.7 before 6.12.14; from 6.13 before 6.13.3 — fixed in 6.1.129, 6.12.14, 6.13.3, 6.6.78

How to fix

Upgrade to a fixed version: Linux kernel 6.1.129, 6.12.14, 6.13.3, 6.6.78. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/233b210a678bddf8b49b02a070074a52b87e6d43
• https://git.kernel.org/stable/c/35ae7910c349fb3c60439992e2e0e79061e95382
• https://git.kernel.org/stable/c/a1b17713b32c75a90132ea2f92b1257f3bbc20f3
• https://git.kernel.org/stable/c/a94592ec30ff67dc36c424327f1e0a9ceeeb9bd3
• https://git.kernel.org/stable/c/b86f1d51731e621e83305dc9564ae14c9ef752bf
• https://git.kernel.org/stable/c/d63b0e8a628e62ca85a0f7915230186bb92f8bb4
• https://git.kernel.org/stable/c/f0ef94553868d07c1b14d7743a7e2553e5a831a3

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