# CVE-2026-89584

## Summary

- **CVE ID:** CVE-2026-89584
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

block: validate user space vectors during extraction

The bio-based drivers don't necessarily check the alignment split, and
stacking block drivers don't always handle a misalignment detected after
submitting the bio. Validate user vectors against the device's
dma_alignment as the bio is built from the iov_iter, rejecting
misaligned early with -EINVAL.

## Affected Products

- Linux — Linux (5ff3f74e145adc79b49668adb8de276446acf6be)
- Linux — Linux (6.18)
- Linux — Linux (0)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/d44a97a3b1c00cc571245124e23e5ceb0a0225a0)
- [CNA](https://git.kernel.org/stable/c/14b007e178811db72fbb1ebb3535160db6ec1e6a)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 4.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._