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CVE Record

CVE-2024-27016: netfilter: flowtable: validate pppoe header

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: validate pppoe header Ensure there is sufficient room to access the protocol field of the PPPoe header. Validate it once before the flowtable lookup, then use a helper function to access protocol field.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A malformed PPPoE packet can make a vulnerable Linux kernel inspect data beyond the validated packet header during netfilter flowtable processing. An adjacent, unauthenticated sender may cause service disruption and limited information exposure. Risk is concentrated on Linux systems that process PPPoE traffic through the affected flowtable path.

Executive priority

Prioritize remediation on PPPoE gateways or network appliances where disruption would affect customers or critical connectivity. Other Linux systems should be inventoried, then ranked by confirmed flowtable and PPPoE use. Treat this as high priority, but the supplied evidence does not justify an emergency response based on active exploitation.

Technical view

The netfilter flowtable path accessed the PPPoE protocol field without first confirming the packet contained enough header data. The kernel fix validates the header once before flowtable lookup and uses a helper for subsequent protocol access. CVSS 3.1 is 7.1: adjacent-network access, low complexity, no privileges or interaction, with high availability and low confidentiality impact.

Likely exposure

Likely exposure is limited to affected Linux kernels using netfilter flowtables with PPPoE traffic reachable from an adjacent network. Internet reachability alone is not established by the AV:A rating. The supplied affected-version data includes ambiguous entries, so distribution-specific package advisories and backport status must determine actual exposure.

Exploitation context

The source bundle does not establish active exploitation, and this CVE is not listed as KEV. It also supplies no evidence of a public proof of concept. Exploitation requires access from an adjacent network and interaction with the vulnerable PPPoE flowtable processing path; absence from KEV does not prove exploitation is impossible.

Researcher notes

The affected-version list appears mechanically ambiguous: it contains “0,” repeated commit hashes, and release numbers without explicit range semantics. Do not infer precise vulnerable or fixed boundaries from that list alone. Confirm ancestry or backports against the linked stable commits and distribution advisories. The sources identify header-length validation as the defect but provide no CWE classification.

Mitigation direction

  • Install a vendor-supported kernel package incorporating the relevant upstream stable fix.
  • Check distribution advisories for fixed package versions and backport status.
  • Prioritize PPPoE gateways and systems using netfilter flowtable processing.
  • If immediate updating is impossible, obtain vendor guidance for supported temporary mitigations.

Validation and detection

  • Inventory running kernel and distribution package versions on PPPoE-capable systems.
  • Confirm whether netfilter flowtables process reachable PPPoE traffic.
  • Compare installed packages with the applicable distribution security advisory.
  • Verify the vendor kernel includes the upstream header-validation fix.
  • After updating, confirm the remediated kernel is running and services operate normally.
Prepared
Confidence
medium
Sources
10

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-2024-27016 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/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
2ADP providers
9Source 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
7.1CVSS 3.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H2.84.2Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2024-27016Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/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
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux72efd585f7144a047f7da63864284764596ccad9, 72efd585f7144a047f7da63864284764596ccad9, 72efd585f7144a047f7da63864284764596ccad9, 72efd585f7144a047f7da63864284764596ccad9, 72efd585f7144a047f7da63864284764596ccad9unaffected
LinuxLinux5.13, 0, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 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.