{"id":"CVE-2023-54198","summary":"tty: fix out-of-bounds access in tty_driver_lookup_tty()","details":"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","modified":"2026-04-02T09:45:41.448765Z","published":"2025-12-30T12:09:04.229Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0473-1","SUSE-SU-2026:0617-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54198.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3df6f492f500a16c231f07ccc6f6ed1302caddf9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/765566110eb0da3cf60198b0165ecceeaafa6444"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84ea44dc3e4ecb2632586238014bf6722aa5843b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/953a4a352a0c185460ae1449e4c6e6658e55fdfc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b79109d6470aaae7062998353e3a19449055829d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db4df8e9d79e7d37732c1a1b560958e8dadfefa1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9d9d25ad1f0d060eaf297a2f7f03b5855a45561"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fcfeaa570f7a5c2d5f4f14931909531ff18b7fde"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54198.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54198"},{"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":"99f1fe189daf8e99a847e420567e49dd7ee2aae7"},{"fixed":"3df6f492f500a16c231f07ccc6f6ed1302caddf9"},{"fixed":"b79109d6470aaae7062998353e3a19449055829d"},{"fixed":"953a4a352a0c185460ae1449e4c6e6658e55fdfc"},{"fixed":"84ea44dc3e4ecb2632586238014bf6722aa5843b"},{"fixed":"f9d9d25ad1f0d060eaf297a2f7f03b5855a45561"},{"fixed":"765566110eb0da3cf60198b0165ecceeaafa6444"},{"fixed":"fcfeaa570f7a5c2d5f4f14931909531ff18b7fde"},{"fixed":"db4df8e9d79e7d37732c1a1b560958e8dadfefa1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54198.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.28"},{"fixed":"4.14.308"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.276"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.235"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.173"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.100"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.18"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.2.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54198.json"}}],"schema_version":"1.7.5"}