What’s Vulnerable › Vulnerabilities

CVE-2026-23259: io_uring/rw: free potentially allocated iovec on cache put failure

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2026-03-18 · updated 2026-10-21

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/rw: free potentially allocated iovec on cache put failure If a read/write request goes through io_req_rw_cleanup() and has an allocated iovec attached and fails to put to the rw_cache, then it may end up with an unaccounted iovec pointer. Have io_rw_recycle() return whether it recycled the request or not, and use that to gauge whether to free a potential iovec or not.

Affected products

• Linux kernel: from 6.10 before 6.18.10; 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5, 6.19-rc6 — fixed in 6.18.10

How to fix

Upgrade to a fixed version: Linux kernel 6.18.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c
• https://git.kernel.org/stable/c/41cda4c66846c3bfcdeaf28444ccabbb55e64cf1
• https://git.kernel.org/stable/c/4b9748055457ac3a0710bf210c229d01ea1b01b9

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