CVE-2026-53306

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.

References

• https://git.kernel.org/stable/c/11207e42a332eb8bbcb9fe74df9edd2a807c5607
• https://git.kernel.org/stable/c/3104a3f40feb107f77d7116ad9bf6c210ab7babf
• https://git.kernel.org/stable/c/3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff
• https://git.kernel.org/stable/c/484357dff256c816d9466bda35eb765685e4dc86
• https://git.kernel.org/stable/c/a76511bc654819425d3b15e77b523d7f9d81f064