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CVE Record

CVE-2024-27402: phonet/pep: fix racy skb_queue_empty() use

In the Linux kernel, the following vulnerability has been resolved: phonet/pep: fix racy skb_queue_empty() use The receive queues are protected by their respective spin-lock, not the socket lock. This could lead to skb_peek() unexpectedly returning NULL or a pointer to an already dequeued socket buffer.

MediumCVSS 5.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-27402 is a Linux kernel race condition in the Phonet PEP networking code. A local, low-privileged user may be able to trigger unreliable queue handling, causing data exposure, data integrity impact, or service disruption. The source bundle rates it medium severity, with availability as the largest impact.

Executive priority

Schedule remediation through normal kernel patch cycles, accelerated for shared Linux infrastructure. There is no provided evidence of active exploitation, but the flaw can affect availability and kernel memory safety paths, making delayed patching risky on systems exposed to local untrusted users.

Technical view

The issue is a racy skb_queue_empty() check in phonet/pep. Receive queues are protected by their own spin-locks, not the socket lock, so skb_peek() may return NULL or a pointer to an already dequeued socket buffer. Linux stable commits are listed as fixes across supported branches.

Likely exposure

Exposure is most likely on systems running affected Linux kernel versions or downstream kernels without the referenced stable fixes. The attack vector is local, requires low privileges, has high complexity, and needs no user interaction. Actual exposure depends on kernel configuration and vendor backports, which are not detailed in the bundle.

Exploitation context

The bundle does not show CISA KEV listing or other evidence of active exploitation. CVSS indicates local access and high attack complexity. Treat this as a patch-management priority for multi-user Linux systems and systems where untrusted local code can run.

Researcher notes

Focus analysis on phonet/pep queue locking behavior and downstream backport status. The source bundle provides the root cause and stable fix references but not proof-of-concept details, exploit maturity, distribution-specific status, or operational mitigations beyond applying fixed kernel code.

Mitigation direction

  • Apply the relevant Linux stable kernel fix or vendor kernel update.
  • Check distribution advisories for backported fixes matching CVE-2024-27402.
  • Prioritize shared, multi-user, and untrusted workload hosts.
  • Avoid assuming fixed status from upstream version numbers alone.
  • Follow vendor guidance if running customized or embedded kernels.

Validation and detection

  • Inventory Linux kernel versions and vendor package build identifiers.
  • Confirm whether vendor advisories mark CVE-2024-27402 as fixed.
  • Verify the relevant stable commit or vendor backport is present.
  • Review affected hosts where local untrusted users or workloads exist.
  • Record KEV status as not listed in the provided bundle.
Prepared
Confidence
medium
Sources
7

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-2024-27402 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/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
6Source 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
5.8CVSS 3.1MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H14.7CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.8Medium
CVSS 3.1 vector shape for CVE-2024-27402Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5, 9641458d3ec42def729fde64669abf07f3220cd5, 9641458d3ec42def729fde64669abf07f3220cd5, 9641458d3ec42def729fde64669abf07f3220cd5, 9641458d3ec42def729fde64669abf07f3220cd5unaffected
LinuxLinux2.6.28, 0, 5.15.181, 6.1.80, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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