KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2024-36971

net: fix __dst_negative_advice() race

Linux / Linux · 4.6

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Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
2.7%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-36971 is net: fix __dst_negative_advice() race affecting Linux Linux. In the Linux kernel, the following vulnerability has been resolved: net: fix __dst_negative_advice() race __dst_negative_advice() does...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Linux / Linux 4.6.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

net: fix __dst_negative_advice() race

In the Linux kernel, the following vulnerability has been resolved:

net: fix __dst_negative_advice() race

__dst_negative_advice() does not enforce proper RCU rules when sk->dst_cache must be cleared, leading to possible UAF.

RCU rules are that we must first clear sk->sk_dst_cache, then call dst_release(old_dst).

Note that sk_dst_reset(sk) is implementing this protocol correctly, while __dst_negative_advice() uses the wrong order.

Given that ip6_negative_advice() has special logic against RTF_CACHE, this means each of the three ->negative_advice() existing methods must perform the sk_dst_reset() themselves.

Note the check against NULL dst is centralized in __dst_negative_advice(), there is no need to duplicate it in various callbacks.

Many thanks to Clement Lecigne for tracking this issue.

This old bug became visible after the blamed commit, using UDP sockets.

Vendor Product Affected Status
Linux Linux Before db0082825037794c5dba9959c9de13ca34cc5e72 Affected
Linux Linux Before 2295a7ef5c8c49241bff769e7826ef2582e532a6 Affected
Linux Linux Before eacb8b195579c174a6d3e12a9690b206eb7f28cf Affected
Linux Linux Before 81dd3c82a456b0015461754be7cb2693991421b4 Affected
Linux Linux Before 5af198c387128a9d2ddd620b0f0803564a4d4508 Affected
Linux Linux Before b8af8e6118a6605f0e495a58d591ca94a85a50fc Affected
Linux Linux Before 92f1655aa2b2294d0b49925f3b875a634bd3b59e Affected
Linux Linux 4.6 Affected
Linux Linux Before 4.6 Unaffected
Linux Linux Through 4.19.* Unaffected
Linux Linux Through 5.4.* Unaffected
Linux Linux Through 5.10.* Unaffected
Linux Linux Through 5.15.* Unaffected
Linux Linux Through 6.1.* Unaffected
Linux Linux Through 6.6.* Unaffected
Linux Linux Through 6.9.* Unaffected
Linux Linux Through * Unaffected
Published
10 Jun 2024
Exploitation Reported
07 Aug 2024
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

Tags

linux nessus_scanner windows cisa

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 07 Aug 2024

Independent exploitation attestation added to the KEV Intelligence record.

Known exploited vulnerability sources

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Source Added
CISA First 2024-08-07 00:00 UTC
CVE 2026-06-05 09:46 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nessus https://www.tenable.com/plugins/nessus/215599 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

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

EPSS

2.7%

Weaknesses

Use After Free CWE-416

Timeline

From disclosure to observed exploitation

  1. KEV confirmed by CVE

    Exploitation attested by an external source

  2. Nessus plugin available

    Scanner coverage available

  3. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

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  • First-party sensor telemetry
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GET /api/v2/pro/kevs/CVE-2024-36971

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2024-36971",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.02701,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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