CVE-2026-74398

Kernel crash via IPv6 address-state race

Published Aug 15, 2026 · Updated Aug 15, 2026

A race in Linux IPv6 address configuration allows attackers to crash the kernel via concurrent DAD failure and address removal. addrconf_dad_failure() releases ifp->lock, then overwrites a concurrent DEAD state with ERRDAD and schedules work that deletes the poisoned list entry again. The public record does not identify attacker privileges or a reliable external trigger; exploitation requires winning the lock-release race before DAD work reuses the deleted entry.

CVSS severity7.0
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race in Linux IPv6 address configuration allows attackers to crash the kernel via concurrent DAD failure and address removal. addrconf_dad_failure() releases ifp->lock, then overwrites a concurrent DEAD state with ERRDAD and schedules work that deletes the poisoned list entry again. The public record does not identify attacker privileges or a reliable external trigger; exploitation requires winning the lock-release race before DAD work reuses the deleted entry.

The record

CVE
CVE-2026-74398
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=3.10.105 <3.11
  2. Affected versionversion=3.14
  3. Affected versionversion=835b474b8f70fa68d68abffad37378e92f661802
  4. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb
  5. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <47b05836705b63dab93d9ac7c69a3a507375ef80
  6. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <627ac78f2741e2ebd2225e2e953b6964a8a9182f
  7. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <875c284c0f98b042bb97abad460f63a24c977f88
  8. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <8ed0ce9ea58d677d1bac92614ee5f60f8ea57363
  9. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <b61af0268e3d1308c466bf0be5dced844eafc1ef
  10. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <d21be7d051012c6b572fa4e3334443c250216f7b
  11. Affected versionversion=c15b1ccadb323ea50023e8f1cca2954129a62b51 <e889aa99ad3ed48bb0ddcff6475b17542532d18b

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.10.105 <3.11; version=3.14; version=835b474b8f70fa68d68abffad37378e92f661802; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <47b05836705b63dab93d9ac7c69a3a507375ef80; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <627ac78f2741e2ebd2225e2e953b6964a8a9182f; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <875c284c0f98b042bb97abad460f63a24c977f88; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <8ed0ce9ea58d677d1bac92614ee5f60f8ea57363; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <b61af0268e3d1308c466bf0be5dced844eafc1ef; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <d21be7d051012c6b572fa4e3334443c250216f7b; version=c15b1ccadb323ea50023e8f1cca2954129a62b51 <e889aa99ad3ed48bb0ddcff6475b17542532d18b

Published CVSS scores

5.3Amazon LinuxCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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