CVE-2026-53306 (GCVE-0-2026-53306)

Vulnerability from cvelistv5 – Published: 2026-06-26 19:41 – Updated: 2026-06-26 19:41
VLAI
Title
tty: hvc_iucv: fix off-by-one in number of supported devices
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < 3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < 484357dff256c816d9466bda35eb765685e4dc86 (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < 11207e42a332eb8bbcb9fe74df9edd2a807c5607 (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4 (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < a76511bc654819425d3b15e77b523d7f9d81f064 (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < 3104a3f40feb107f77d7116ad9bf6c210ab7babf (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < f1dc8e72de9aabe5d96767a4e97219ac26b79fe5 (git)
Affected: 44a01d5ba8a4d543694461cd3e178cfa6b3f221b , < f2a880e802ad12d1e38039d1334fb1475d0f5241 (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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  }
}


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