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CVE Record

CVE-2024-50205: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size()

In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size() The step variable is initialized to zero. It is changed in the loop, but if it's not changed it will remain zero. Add a variable check before the division. The observed behavior was introduced by commit 826b5de90c0b ("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"), and it is difficult to show that any of the interval parameters will satisfy the snd_interval_test() condition with data from the amdtp_rate_table[] table. Found by Linux Verification Center (linuxtesting.org) with SVACE.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel denial-of-service issue in ALSA FireWire audio handling. A local low-privileged user may be able to trigger a divide-by-zero condition, affecting system availability. It does not indicate data theft or integrity impact in the provided sources.

Executive priority

Treat as a scheduled but real availability fix. It is not a remote compromise issue based on the sources, but kernel denial-of-service bugs matter on shared systems, operational workstations, and embedded deployments.

Technical view

The flaw is CWE-369 in ALSA firewire-lib apply_constraint_to_size(). The step variable can remain zero and later be used as a divisor. Linux stable fixes add a check before division. The issue was introduced by commit 826b5de90c0b and found by Linux Verification Center with SVACE.

Likely exposure

Exposure is most relevant on Linux systems running affected kernel versions with ALSA FireWire audio functionality present. Business risk is higher on multi-user systems, workstations, or embedded products where local users or local code execution are realistic.

Exploitation context

The CVSS vector is local, low complexity, low privileges, no user interaction, and high availability impact. The provided bundle says KEV is false and includes no cited evidence of active exploitation or public exploit use.

Researcher notes

Evidence supports a local availability flaw caused by an unchecked zero divisor. The bundle does not prove practical trigger conditions from amdtp_rate_table data, and it does not show active exploitation. Validate exposure through kernel lineage and enabled FireWire audio paths.

Mitigation direction

  • Apply vendor kernel updates that include the listed Linux stable fixes.
  • Check Debian LTS, Siemens, and platform vendor advisories for product-specific guidance.
  • Prioritize systems with local user access and FireWire audio support.
  • Use vendor-approved configuration changes if patching must be delayed.
  • Retest audio and system stability after kernel updates.

Validation and detection

  • Inventory Linux kernel versions against the affected and fixed version ranges.
  • Confirm whether ALSA FireWire audio components are present or enabled.
  • Review vendor advisories for affected downstream packages or products.
  • Verify patched kernels include one of the listed stable commits.
  • Document systems where patching is deferred and why.
Prepared
Confidence
high
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-369: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2024-50205 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

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

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.

1CVSS vectors
3Timeline events
3ADP providers
11Source links

SSVC decision data

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

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2024-50205Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
cvssV3_1other:ssvc
CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588, 826b5de90c0bca4e9de6231da9e1730480621588unaffected
LinuxLinux4.20, 0, 5.4.285, 5.10.229, 5.15.170, 6.1.115, 6.6.59, 6.11.6, 6.12affected
Weakness

CWE details

CWE-369

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-369 · source CWE mapping

Divide By Zero

Divide By Zero represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs