CVE-2024-27390

Local denial of service via multicast barrier

Published May 1, 2024 · Updated Jul 24, 2026

Denial of service in Linux IPv6 multicast teardown from 5.13 through 6.8.1 allows local users to interrupt service under load. The ipv6_mc_down() path performs an unnecessary synchronize_net() barrier that can delay teardown for 200 microseconds to 5 milliseconds under load. Low-privileged local access and sustained load are required; an upstream stable reviewer described the change as a performance tweak rather than a bug fix, so the security impact remains disputed.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux IPv6 multicast teardown from 5.13 through 6.8.1 allows local users to interrupt service under load. The ipv6_mc_down() path performs an unnecessary synchronize_net() barrier that can delay teardown for 200 microseconds to 5 milliseconds under load. Low-privileged local access and sustained load are required; an upstream stable reviewer described the change as a performance tweak rather than a bug fix, so the security impact remains disputed.

The record

CVE
CVE-2024-27390
Published
May 1, 2024
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.13
  2. Affected versionversion=94d6a071ab2f26eb18a83109940db0cec19552fd <bfd2f3c58ad86ad33db80515e6c3503e0414e44b
  3. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <17ef8efc00b34918b966388b2af0993811895a8c
  4. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <26d4bac55750d535f1f0b8790dc26daf6089e373
  5. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <5da9a218340a2bc804dc4327e5804392e24a0b88
  6. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <7eb06ee5921189812e6b4bfe7b0f1e878be16df7
  7. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <9d159d6637ccce25f879d662a480541ef4ba3a50
  8. Affected versionversion=f185de28d9ae6c978135993769352e523ee8df06 <a03ede2282ebbd181bd6f5c38cbfcb5765afcd04

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=94d6a071ab2f26eb18a83109940db0cec19552fd <bfd2f3c58ad86ad33db80515e6c3503e0414e44b; version=f185de28d9ae6c978135993769352e523ee8df06 <17ef8efc00b34918b966388b2af0993811895a8c; version=f185de28d9ae6c978135993769352e523ee8df06 <26d4bac55750d535f1f0b8790dc26daf6089e373; version=f185de28d9ae6c978135993769352e523ee8df06 <5da9a218340a2bc804dc4327e5804392e24a0b88; version=f185de28d9ae6c978135993769352e523ee8df06 <7eb06ee5921189812e6b4bfe7b0f1e878be16df7; version=f185de28d9ae6c978135993769352e523ee8df06 <9d159d6637ccce25f879d662a480541ef4ba3a50; version=f185de28d9ae6c978135993769352e523ee8df06 <a03ede2282ebbd181bd6f5c38cbfcb5765afcd04

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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