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CVE-2018-10940: The cdrom_ioctl_media_changed function in drivers/cdrom/cdrom.c in the Linux kernel before 4.16.6 allows lo...

The cdrom_ioctl_media_changed function in drivers/cdrom/cdrom.c in the Linux kernel before 4.16.6 allows local attackers to use a incorrect bounds check in the CDROM driver CDROM_MEDIA_CHANGED ioctl to read out kernel memory.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2018-10940 is a Linux kernel information-disclosure bug. A local attacker could abuse a CD-ROM driver ioctl bounds-check error to read kernel memory. This is not described as remote code execution, and the provided sources do not show active exploitation.

Executive priority

Schedule normal-to-expedited remediation for exposed Linux fleets, with higher priority for shared, multi-user, or workload-hosting systems. Business urgency is lower than remotely exploitable kernel bugs, but kernel memory disclosure can weaken isolation and support attack chains.

Technical view

The issue is in cdrom_ioctl_media_changed in drivers/cdrom/cdrom.c before Linux kernel 4.16.6. An incorrect bounds check in CDROM_MEDIA_CHANGED could expose kernel memory to a local attacker. Kernel, Ubuntu, Debian, and Red Hat references identify security updates for affected Linux kernels.

Likely exposure

Exposure is most likely on Linux systems running vulnerable pre-4.16.6 or affected vendor backport kernels, especially where untrusted local users or processes can access CD-ROM device interfaces. Confirm exposure through distribution kernel package advisories, not upstream version alone.

Exploitation context

The source bundle marks KEV as false and does not cite active exploitation. The described attack is local and requires access sufficient to invoke the affected CD-ROM ioctl path. Treat this as a local information leak that may assist broader compromise if chained with other issues.

Researcher notes

The public description is concise and lacks CVSS, CWE, exploit telemetry, and detailed affected package ranges. Use vendor advisories for distro-specific fix mapping. Avoid assuming all kernels numerically below 4.16.6 are vulnerable without considering vendor backports.

Mitigation direction

  • Apply the relevant Linux kernel security update from your distribution vendor.
  • Prioritize multi-user systems and hosts running untrusted workloads.
  • Check Ubuntu, Debian, and Red Hat advisories for fixed package versions.
  • Reboot into the updated kernel after patch installation.
  • If patching is delayed, restrict untrusted local access where feasible.

Validation and detection

  • Inventory Linux kernel versions and distribution package release levels.
  • Compare installed kernels against vendor advisories and kernel 4.16.6 fix references.
  • Confirm systems have rebooted into the patched kernel.
  • Review device access policies for CD-ROM interfaces on shared hosts.
  • Document exceptions where vendor fix status is unclear.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
15Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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