{"cve":"CVE-2023-54198","nvd":{"published":"2025-12-30T13:16:07.877","modified":"2026-10-15T22:17:54.633","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix out-of-bounds access in tty_driver_lookup_tty()\n\nWhen specifying an invalid console= device like console=tty3270,\ntty_driver_lookup_tty() returns the tty struct without checking\nwhether index is a valid number.\n\nTo reproduce:\n\nqemu-system-x86_64 -enable-kvm -nographic -serial mon:stdio \\\n-kernel ../linux-build-x86/arch/x86/boot/bzImage \\\n-append \"console=ttyS0 console=tty3270\"\n\nThis crashes with:\n\n[    0.770599] BUG: kernel NULL pointer dereference, address: 00000000000000ef\n[    0.771265] #PF: supervisor read access in kernel mode\n[    0.771773] #PF: error_code(0x0000) - not-present page\n[    0.772609] Oops: 0000 [#1] PREEMPT SMP PTI\n[    0.774878] RIP: 0010:tty_open+0x268/0x6f0\n[    0.784013]  chrdev_open+0xbd/0x230\n[    0.784444]  ? cdev_device_add+0x80/0x80\n[    0.784920]  do_dentry_open+0x1e0/0x410\n[    0.785389]  path_openat+0xca9/0x1050\n[    0.785813]  do_filp_open+0xaa/0x150\n[    0.786240]  file_open_name+0x133/0x1b0\n[    0.786746]  filp_open+0x27/0x50\n[    0.787244]  console_on_rootfs+0x14/0x4d\n[    0.787800]  kernel_init_freeable+0x1e4/0x20d\n[    0.788383]  ? rest_init+0xc0/0xc0\n[    0.788881]  kernel_init+0x11/0x120\n[    0.789356]  ret_from_fork+0x22/0x30","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":[],"references":["https://git.kernel.org/stable/c/3df6f492f500a16c231f07ccc6f6ed1302caddf9","https://git.kernel.org/stable/c/765566110eb0da3cf60198b0165ecceeaafa6444","https://git.kernel.org/stable/c/84ea44dc3e4ecb2632586238014bf6722aa5843b","https://git.kernel.org/stable/c/953a4a352a0c185460ae1449e4c6e6658e55fdfc","https://git.kernel.org/stable/c/b79109d6470aaae7062998353e3a19449055829d"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:18:08.089039631+00:00"},"epss":{"cve":"CVE-2023-54198","score":0.00155,"percentile":0.04605,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}