{"id":"CVE-2023-54198","title":"tty: fix out-of-bounds access in tty_driver_lookup_tty()","summary":"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 struc…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 3df6f492f500a16c231f07ccc6f6ed1302caddf9","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < b79109d6470aaae7062998353e3a19449055829d","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 953a4a352a0c185460ae1449e4c6e6658e55fdfc","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 84ea44dc3e4ecb2632586238014bf6722aa5843b","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < f9d9d25ad1f0d060eaf297a2f7f03b5855a45561","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 765566110eb0da3cf60198b0165ecceeaafa6444","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < fcfeaa570f7a5c2d5f4f14931909531ff18b7fde","Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < db4df8e9d79e7d37732c1a1b560958e8dadfefa1","Linux 2.6.28"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:38:58.741580Z"},"published":"2025-12-30","updated":"2026-10-15","sourceUpdated":"2026-10-15T21:41:41.131Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54198","references":[{"url":"https://git.kernel.org/stable/c/3df6f492f500a16c231f07ccc6f6ed1302caddf9"},{"url":"https://git.kernel.org/stable/c/b79109d6470aaae7062998353e3a19449055829d"},{"url":"https://git.kernel.org/stable/c/953a4a352a0c185460ae1449e4c6e6658e55fdfc"},{"url":"https://git.kernel.org/stable/c/84ea44dc3e4ecb2632586238014bf6722aa5843b"},{"url":"https://git.kernel.org/stable/c/f9d9d25ad1f0d060eaf297a2f7f03b5855a45561"},{"url":"https://git.kernel.org/stable/c/765566110eb0da3cf60198b0165ecceeaafa6444"},{"url":"https://git.kernel.org/stable/c/fcfeaa570f7a5c2d5f4f14931909531ff18b7fde"},{"url":"https://git.kernel.org/stable/c/db4df8e9d79e7d37732c1a1b560958e8dadfefa1"}],"tags":["cve.org"],"epss":0.00155,"epssPercentile":0.04205,"ingestedAt":"2026-10-15T22:48:25.432Z","slug":"CVE-2023-54198","body":"## Overview\n\nIn 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\n\n## Affected\n\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 3df6f492f500a16c231f07ccc6f6ed1302caddf9`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < b79109d6470aaae7062998353e3a19449055829d`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 953a4a352a0c185460ae1449e4c6e6658e55fdfc`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 84ea44dc3e4ecb2632586238014bf6722aa5843b`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < f9d9d25ad1f0d060eaf297a2f7f03b5855a45561`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 765566110eb0da3cf60198b0165ecceeaafa6444`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < fcfeaa570f7a5c2d5f4f14931909531ff18b7fde`\n- `Linux >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < db4df8e9d79e7d37732c1a1b560958e8dadfefa1`\n- `Linux 2.6.28`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}