# CVE-2026-89745

## Summary

- **CVE ID:** CVE-2026-89745
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

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

debugfs: Fix lockdown check for mmap_prepare

Commit 651fdda8406d ("relay: update relay to use mmap_prepare")
changed the `mmap` file operation to `mmap_prepare` for relayfs, but
the lockdown check in debugfs was not updated accordingly.

This prevents debugfs from being locked down when the kernel is in
integrity mode if a file uses `mmap_prepare` but not `mmap`.

Since the conversion to `mmap_prepare` across the kernel is not yet
complete, update the lockdown check to look for both `mmap` and
`mmap_prepare` to ensure comprehensive coverage.

## Affected Products

- Linux — Linux (651fdda8406d42a5004c5c79f269540a85d6a1ab)
- Linux — Linux (6.19)
- Linux — Linux (0)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208)
- [CNA](https://git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.15%
- **EPSS Percentile:** 5.1

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