CVE-2023-54198
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: tty: fix out-of-bounds access in tty_driver_lookup_tty() When specifying an invalid console= device like console=tty3270, tty_driver_lookup_tty() returns the tty struct without checking whether index is a valid number. To reproduce: qemu-system-x86_64 -enable-kvm -nographic -serial mon:stdio \ -kernel ../linux-build-x86/arch/x86/boot/bzImage \ -append "console=ttyS0 console=tty3270" This crashes with: [ 0.770599] BUG: kernel NULL pointer dereference, address: 00000000000000ef [ 0.771265] #PF: supervisor read access in kernel mode [ 0.771773] #PF: error_code(0x0000) - not-present page [ 0.772609] Oops: 0000 [#1] PREEMPT SMP PTI [ 0.774878] RIP: 0010:tty_open+0x268/0x6f0 [ 0.784013] chrdev_open+0xbd/0x230 [ 0.784444] ? cdev_device_add+0x80/0x80 [ 0.784920] do_dentry_open+0x1e0/0x410 [ 0.785389] path_openat+0xca9/0x1050 [ 0.785813] do_filp_open+0xaa/0x150 [ 0.786240] file_open_name+0x133/0x1b0 [ 0.786746] filp_open+0x27/0x50 [ 0.787244] console_on_rootfs+0x14/0x4d [ 0.787800] kernel_init_freeable+0x1e4/0x20d [ 0.788383] ? rest_init+0xc0/0xc0 [ 0.788881] kernel_init+0x11/0x120 [ 0.789356] ret_from_fork+0x22/0x30
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-12-30 13:16:07.877000
Last modified
2026-10-28 19:10:00.193000
View original CVE JSON
{
"id": "CVE-2023-54198",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-12-30T13:16:07.877",
"lastModified": "2026-10-28T19:10:00.193",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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"
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ntty: corregir acceso fuera de límites en tty_driver_lookup_tty()\n\nAl especificar un dispositivo console= inválido como console=tty3270,\ntty_driver_lookup_tty() devuelve la estructura tty sin verificar\nsi el índice es un número válido.\n\nPara reproducir:\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\nEsto falla con:\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"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/tty/tty_io.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "99f1fe189daf8e99a847e420567e49dd7ee2aae7",
"lessThan": "3df6f492f500a16c231f07ccc6f6ed1302caddf9",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "b79109d6470aaae7062998353e3a19449055829d",
"versionType": "git",
"status": "affected"
},
{
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"versionType": "git",
"status": "affected"
},
{
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"status": "affected"
},
{
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"lessThan": "f9d9d25ad1f0d060eaf297a2f7f03b5855a45561",
"versionType": "git",
"status": "affected"
},
{
"version": "99f1fe189daf8e99a847e420567e49dd7ee2aae7",
"lessThan": "765566110eb0da3cf60198b0165ecceeaafa6444",
"versionType": "git",
"status": "affected"
},
{
"version": "99f1fe189daf8e99a847e420567e49dd7ee2aae7",
"lessThan": "fcfeaa570f7a5c2d5f4f14931909531ff18b7fde",
"versionType": "git",
"status": "affected"
},
{
"version": "99f1fe189daf8e99a847e420567e49dd7ee2aae7",
"lessThan": "db4df8e9d79e7d37732c1a1b560958e8dadfefa1",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/tty/tty_io.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "2.6.28",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.28",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "4.14.308",
"lessThanOrEqual": "4.14.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "4.19.276",
"lessThanOrEqual": "4.19.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.4.235",
"lessThanOrEqual": "5.4.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.173",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.100",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.18",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.2.5",
"lessThanOrEqual": "6.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-15T21:38:58.741580Z",
"id": "CVE-2023-54198",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3df6f492f500a16c231f07ccc6f6ed1302caddf9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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{
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{
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{
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{
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{
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}