{"id":"CVE-2026-53306","summary":"tty: hvc_iucv: fix off-by-one in number of supported devices","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: hvc_iucv: fix off-by-one in number of supported devices\n\nMAX_HVC_IUCV_LINES == HVC_ALLOC_TTY_ADAPTERS == 8.\nThis is the number of entries in:\n  static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];\n\nSometimes hvc_iucv_table[] is limited by:\n(a)\tif (num \u003e hvc_iucv_devices) // for error detection\nor\n(b)\tfor (i = 0; i \u003c hvc_iucv_devices; i++) // in 2 places\n(so these 2 don't agree; second one appears to be correct to me.)\n\nhvc_iucv_devices can be 0..8. This is a counter.\n(c)\tif (hvc_iucv_devices \u003e MAX_HVC_IUCV_LINES)\n\nIf hvc_iucv_devices == 8, (a) allows the code to access hvc_iucv_table[8].\nOops.","modified":"2026-07-15T01:49:08.722161479Z","published":"2026-06-26T19:41:01.338Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53306.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/11207e42a332eb8bbcb9fe74df9edd2a807c5607"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3104a3f40feb107f77d7116ad9bf6c210ab7babf"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff"},{"type":"WEB","url":"https://git.kernel.org/stable/c/484357dff256c816d9466bda35eb765685e4dc86"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a76511bc654819425d3b15e77b523d7f9d81f064"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1dc8e72de9aabe5d96767a4e97219ac26b79fe5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f2a880e802ad12d1e38039d1334fb1475d0f5241"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53306.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53306"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"44a01d5ba8a4d543694461cd3e178cfa6b3f221b"},{"fixed":"3d3b89e6ab93bdd0efd45828bda6b0e61cc46dff"},{"fixed":"484357dff256c816d9466bda35eb765685e4dc86"},{"fixed":"11207e42a332eb8bbcb9fe74df9edd2a807c5607"},{"fixed":"fed8b8f33a46db0ee2efdb000f4f630c86ed8ca4"},{"fixed":"a76511bc654819425d3b15e77b523d7f9d81f064"},{"fixed":"3104a3f40feb107f77d7116ad9bf6c210ab7babf"},{"fixed":"f1dc8e72de9aabe5d96767a4e97219ac26b79fe5"},{"fixed":"f2a880e802ad12d1e38039d1334fb1475d0f5241"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53306.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53306.json"}}],"schema_version":"1.7.5"}