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CVE Record

CVE-2024-36974: net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP

In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP If one TCA_TAPRIO_ATTR_PRIOMAP attribute has been provided, taprio_parse_mqprio_opt() must validate it, or userspace can inject arbitrary data to the kernel, the second time taprio_change() is called. First call (with valid attributes) sets dev->num_tc to a non zero value. Second call (with arbitrary mqprio attributes) returns early from taprio_parse_mqprio_opt() and bad things can happen.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-36974 is a Linux kernel traffic-scheduling flaw in taprio. A userspace caller can provide malformed priority-map attributes after an earlier valid configuration, causing unvalidated data to reach kernel handling. The public record does not provide CVSS, impact class, privilege requirements, or confirmed exploitation.

Executive priority

Treat as a kernel maintenance issue with uncertain severity. Patch through normal kernel update channels, but escalate for multi-tenant, containerized, or industrial systems where userspace networking controls may be delegated.

Technical view

The taprio qdisc path failed to always validate TCA_TAPRIO_ATTR_PRIOMAP. After a first taprio_change() sets dev->num_tc nonzero, a second call can return early from taprio_parse_mqprio_opt() with arbitrary mqprio attributes, allowing userspace-controlled data into kernel logic. Kernel stable commits are listed as fixes.

Likely exposure

Exposure is limited to Linux systems running affected kernel versions where taprio or mqprio traffic-control configuration is reachable. The source bundle lists affected Linux versions from 5.2 through fixed stable lines but does not identify distributions, default configurations, or required privileges.

Exploitation context

No CISA KEV listing is present, and the provided sources do not report active exploitation or public weaponization. The description implies local userspace interaction with Linux networking scheduler configuration, but the exact attacker privileges and practical impact are not stated.

Researcher notes

Evidence is sparse. The core bug is missing validation of TCA_TAPRIO_ATTR_PRIOMAP in taprio_parse_mqprio_opt() during repeated taprio_change() calls. Sources do not define CWE, CVSS, privilege requirements, crash behavior, memory corruption outcome, or exploitability.

Mitigation direction

  • Update to a Linux kernel containing the referenced stable fixes.
  • Check distribution vendor advisories for backported kernel packages.
  • Prioritize systems exposing traffic-control configuration to tenants or containers.
  • Review Siemens advisories if using affected Siemens products.
  • Avoid direct deployment assumptions until vendor guidance confirms package status.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded systems.
  • Compare installed kernels against vendor advisories and fixed stable releases.
  • Identify hosts where taprio or mqprio traffic scheduling is configured.
  • Confirm whether untrusted users can alter traffic-control settings.
  • Track CVE-2024-36974 in vulnerability management until vendor status is closed.
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-2024-36974 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
11Source 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

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxa3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213, a3d43c0d56f1b94e74963a2fbadfb70126d92213unaffected
LinuxLinux5.2, 0, 5.4.279, 5.10.221, 5.15.162, 6.1.95, 6.6.35, 6.9.6, 6.10affected
Weakness

CWE details

No CWE listed

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