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CVE Record

CVE-2024-35945: net: phy: phy_device: Prevent nullptr exceptions on ISR

In the Linux kernel, the following vulnerability has been resolved: net: phy: phy_device: Prevent nullptr exceptions on ISR If phydev->irq is set unconditionally, check for valid interrupt handler or fall back to polling mode to prevent nullptr exceptions in interrupt service routine.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel networking bug in PHY interrupt handling. In affected kernels, a device interrupt can reach missing handler logic and trigger a null pointer exception, likely causing instability or a crash. The sources do not provide CVSS scoring, exploit details, or broad impact evidence.

Executive priority

Track for normal-to-expedited kernel maintenance, with higher priority for network appliances and systems where kernel crashes affect availability. Current public evidence does not support emergency response on its own.

Technical view

The resolved kernel change checks whether a valid PHY interrupt handler exists when phydev->irq is set. If not, it falls back to polling mode to avoid null pointer exceptions inside the interrupt service routine. Exposure depends on affected kernel versions and relevant PHY/network driver behavior.

Likely exposure

Organizations running affected Linux kernel versions or downstream vendor kernels may be exposed, especially on systems using PHY network hardware with interrupt-driven link handling. The provided affected-version data is limited and should be verified against vendor kernel advisories.

Exploitation context

The bundle does not cite active exploitation, public exploit availability, or KEV listing. Treat this as a reliability and possible availability issue unless vendor guidance provides stronger impact evidence.

Researcher notes

Key review point is whether phydev->irq can be configured without a valid handler in affected code paths. The fix direction is defensive validation and polling fallback, not a documented remote exploit path.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable fixes.
  • If self-maintaining kernels, review and merge the relevant stable commits.
  • Prioritize internet-facing, network-critical, embedded, and appliance Linux systems.
  • Check vendor advisories for distro-specific fixed package versions.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded devices.
  • Compare kernel builds with CVE-2024-35945 and the referenced stable commits.
  • Confirm downstream vendor kernels include the PHY interrupt handling fix.
  • Review crash logs for PHY interrupt or null pointer exception patterns.
Prepared
Confidence
medium
Sources
5

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-2024-35945 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
2ADP providers
4Source 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux49644e68f472c6480e015253fa4d7448c6cfa2aa, 49644e68f472c6480e015253fa4d7448c6cfa2aa, 49644e68f472c6480e015253fa4d7448c6cfa2aaunaffected
LinuxLinux5.3, 0, 6.6.27, 6.8.6, 6.9affected
Weakness

CWE details

No CWE listed

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