Description

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

tty: hvc_iucv: fix off-by-one in number of supported devices

MAX_HVC_IUCV_LINES == HVC_ALLOC_TTY_ADAPTERS == 8. This is the number of entries in: static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];

Sometimes hvc_iucv_table[] is limited by: (a) if (num > hvc_iucv_devices) // for error detection or (b) for (i = 0; i < hvc_iucv_devices; i++) // in 2 places (so these 2 don't agree; second one appears to be correct to me.)

hvc_iucv_devices can be 0..8. This is a counter. (c) if (hvc_iucv_devices > MAX_HVC_IUCV_LINES)

If hvc_iucv_devices == 8, (a) allows the code to access hvc_iucv_table[8]. Oops.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-193

Affected software

Vendor	Product	Versions
Linux	Linux	>= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < 3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < 484357dff256c816d9466bda35eb765685e4dc86; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < 11207e42a332eb8bbcb9fe74df9edd2a807c5607; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < a76511bc654819425d3b15e77b523d7f9d81f064; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < 3104a3f40feb107f77d7116ad9bf6c210ab7babf; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < f1dc8e72de9aabe5d96767a4e97219ac26b79fe5; >= 44a01d5ba8a4d543694461cd3e178cfa6b3f221b, < f2a880e802ad12d1e38039d1334fb1475d0f5241
Linux	Linux	2.6.29

References

Timeline

Published: Jun 26, 2026
Last modified: Nov 6, 2026
NVD status: Analyzed

CVE-2026-53306