tty: fix out-of-bounds access in tty_driver_lookup_tty()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-54198
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-30 13:16:07 UTC
Updated2026-10-15 22:17:54 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001350000 probability, percentile 0.033450000 (date 2026-08-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 3df6f492f500a16c231f07ccc6f6ed1302caddf9 git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 b79109d6470aaae7062998353e3a19449055829d git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 953a4a352a0c185460ae1449e4c6e6658e55fdfc git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 84ea44dc3e4ecb2632586238014bf6722aa5843b git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 f9d9d25ad1f0d060eaf297a2f7f03b5855a45561 git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 765566110eb0da3cf60198b0165ecceeaafa6444 git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 fcfeaa570f7a5c2d5f4f14931909531ff18b7fde git Not specified
CNA Linux Linux affected 99f1fe189daf8e99a847e420567e49dd7ee2aae7 db4df8e9d79e7d37732c1a1b560958e8dadfefa1 git Not specified
CNA Linux Linux affected 2.6.28 Not specified
CNA Linux Linux unaffected 2.6.28 semver Not specified
CNA Linux Linux unaffected 4.14.308 4.14.* semver Not specified
CNA Linux Linux unaffected 4.19.276 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.235 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.173 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.100 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.18 6.1.* semver Not specified
CNA Linux Linux unaffected 6.2.5 6.2.* semver Not specified
CNA Linux Linux unaffected 6.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fcfeaa570f7a5c2d5f4f14931909531ff18b7fde 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84ea44dc3e4ecb2632586238014bf6722aa5843b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/953a4a352a0c185460ae1449e4c6e6658e55fdfc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/765566110eb0da3cf60198b0165ecceeaafa6444 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/db4df8e9d79e7d37732c1a1b560958e8dadfefa1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9d9d25ad1f0d060eaf297a2f7f03b5855a45561 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3df6f492f500a16c231f07ccc6f6ed1302caddf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b79109d6470aaae7062998353e3a19449055829d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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