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Review reviewHigh

CVE-2023-54198

Linux

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 kerne...

CVSS
7.8
EPSS
0.14%
3.36% percentile
CISA KEV
Not listed
Published
2025.12.30
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

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 kerne...

Affected product and versions

Product
Linux
Affected versions
>= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 3df6f492f500a16c231f07ccc6f6ed1302caddf9, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < b79109d6470aaae7062998353e3a19449055829d, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 953a4a352a0c185460ae1449e4c6e6658e55fdfc, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 84ea44dc3e4ecb2632586238014bf6722aa5843b, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < f9d9d25ad1f0d060eaf297a2f7f03b5855a45561, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < 765566110eb0da3cf60198b0165ecceeaafa6444, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < fcfeaa570f7a5c2d5f4f14931909531ff18b7fde, >= 99f1fe189daf8e99a847e420567e49dd7ee2aae7 < db4df8e9d79e7d37732c1a1b560958e8dadfefa1, >= 2.6.28
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available