CVE-2026-74598Network attack vector

Information disclosure via IPv6 route option over-read

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds read in the Linux IPv6 routing stack allows remote attackers to expose up to eight kernel-adjacent bytes through Router Advertisements. rt6_route_rcv() accepts RFC 4191 Route Information option lengths one unit too short, and ipv6_addr_prefix() copies beyond the option into the installed route prefix. The target must accept IPv6 Router Advertisements with nonzero route prefixes; the disclosed bytes become visible to local userspace rather than returning to the remote sender.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux IPv6 routing stack allows remote attackers to expose up to eight kernel-adjacent bytes through Router Advertisements. rt6_route_rcv() accepts RFC 4191 Route Information option lengths one unit too short, and ipv6_addr_prefix() copies beyond the option into the installed route prefix. The target must accept IPv6 Router Advertisements with nonzero route prefixes; the disclosed bytes become visible to local userspace rather than returning to the remote sender.

The record

CVE
CVE-2026-74598
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=2.6.17
  2. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d
  3. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <2f6f94eda12430fb41b24b44a71e2ea4e93561d7
  4. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <3b2231e358d26e3aec5d8040b1fb777af03c5f05
  5. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <7309529f257ae18e72112ef9f614edfd6df229bb
  6. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <7eac87396c44a312be457ef41d4c5687883be9a2
  7. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824
  8. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <da64ed1f346ba84df574d6469fa2e422b2511719
  9. Affected versionversion=70ceb4f53929f73746be72f73707cd9f8753e2fc <ff3cb05289b8a4ef95fa7ea14c7d34818359edbb

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.17; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <0b9e02f3bd31c888f2ccdc0ca08e546d6abe9c4d; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <2f6f94eda12430fb41b24b44a71e2ea4e93561d7; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <3b2231e358d26e3aec5d8040b1fb777af03c5f05; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <7309529f257ae18e72112ef9f614edfd6df229bb; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <7eac87396c44a312be457ef41d4c5687883be9a2; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <d1ad8fb2ac6a1afb71dc22d9ae8efb4dda96c824; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <da64ed1f346ba84df574d6469fa2e422b2511719; version=70ceb4f53929f73746be72f73707cd9f8753e2fc <ff3cb05289b8a4ef95fa7ea14c7d34818359edbb

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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