# CVE-2026-89726

## Summary

- **CVE ID:** CVE-2026-89726
- **Severity:** UNKNOWN
- **CVSS Score:** 0
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

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

lib/ucs2_string.c: fix out-of-bounds read in ucs2_strnlen()

Patch series "lib/ucs2_string.c: fix out-of-bounds read in
ucs2_strnlen()", v2.

This series fixes an off-by-one out-of-bounds read in ucs2_strnlen().

The first patch is the real fix, the second patch comes as a bonus and
fixes the code indentation.


This patch (of 2):

ucs2_strnlen() checks the current character before checking whether the
caller-provided maximum length has been reached.  If the input is not
NUL-terminated within that bound, the loop can read one ucs2_char_t past
the limit.

Test the length before dereferencing to prevent an off-by-one
out-of-bounds read.

## Affected Products

- Linux — Linux (1da177e4c3f41524e886b7f1b8a0c1fc7321cac2)
- Linux — Linux (2.6.12)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/709eb41adaf78d59d4579a13a898125919b69bcc)
- [CNA](https://git.kernel.org/stable/c/7d658da725ea81c91f73087547b97e7ced82d62b)
- [CNA](https://git.kernel.org/stable/c/1b0dc3cbb8630f0b5cb34d848628225920a904be)
- [CNA](https://git.kernel.org/stable/c/cec0d03fe785380540dc1b4d07c80f67ae2ffc78)
- [CNA](https://git.kernel.org/stable/c/04ae68af4107600120c3c41c94268f43bc350d48)
- [CNA](https://git.kernel.org/stable/c/2e5a70a175f0c74e7238b013a96c4eabc3002934)
- [CNA](https://git.kernel.org/stable/c/3ada20e110bf3245edb0a3bcddadc33d0f142f8d)
- [CNA](https://git.kernel.org/stable/c/60c74f42f5abddb85dd919b4448d5474e65dbe76)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.5

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