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CVE Record

CVE-2024-35922: fbmon: prevent division by zero in fb_videomode_from_videomode()

In the Linux kernel, the following vulnerability has been resolved: fbmon: prevent division by zero in fb_videomode_from_videomode() The expression htotal * vtotal can have a zero value on overflow. It is necessary to prevent division by zero like in fb_var_to_videomode(). Found by Linux Verification Center (linuxtesting.org) with Svace.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-35922 is a Linux kernel bug in framebuffer monitor video-mode conversion. Certain display mode calculations can produce zero and trigger a division by zero. The sources do not provide CVSS, confirmed exploitation, or detailed impact beyond kernel stability risk, so urgency depends on whether affected kernels are deployed.

Executive priority

Track this as a kernel maintenance item, not an emergency based on current evidence. Patch affected systems through normal security update processes, with faster handling for critical Linux infrastructure or vendor appliances where kernel updates lag.

Technical view

The issue is in fb_videomode_from_videomode() in fbmon. The CVE record says htotal * vtotal may become zero on overflow, so later division must be guarded, matching existing handling in fb_var_to_videomode(). Stable kernel commits backport the fix across maintained branches.

Likely exposure

Exposure is likely limited to systems running affected Linux kernel versions with framebuffer video-mode handling reachable in their workload. The bundle lists Linux kernel versions from 3.9 through fixed stable releases as affected, but does not identify specific distributions beyond Debian LTS advisories or Siemens product context.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation or public exploit use. The bug was found by Linux Verification Center with Svace, suggesting a discovered code flaw rather than reported exploitation.

Researcher notes

Key uncertainty is impact. The record describes a division-by-zero prevention fix but provides no CVSS, CWE, crash path, privilege context, or attacker control details. Avoid assuming remote exploitability; validate by kernel version, downstream vendor advisory, and presence of the relevant fbmon fix.

Mitigation direction

  • Update affected Linux kernels to vendor-provided fixed stable releases.
  • Check Debian LTS advisories if using Debian-based long-term support systems.
  • Review Siemens guidance where Siemens products or appliances are in scope.
  • Prioritize internet-facing or high-availability Linux systems if affected.
  • If no vendor package is available, monitor vendor kernel advisories.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded systems.
  • Confirm whether deployed kernels include one of the referenced stable commits.
  • Check distribution security advisories for patched package versions.
  • Validate that Debian LTS systems received the relevant kernel updates.
  • Record unsupported or custom kernels for separate remediation tracking.
Prepared
Confidence
medium
Sources
12

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2024-35922 mapping review

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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
3Timeline events
3ADP providers
12Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbd, 2db54c72395298a58f29c75ae880be9e478fdbbdunaffected
LinuxLinux3.9, 0, 4.19.312, 5.4.274, 5.10.215, 5.15.155, 6.1.86, 6.6.27, 6.8.6, 6.9affected
Weakness

CWE details

No CWE listed

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