CVE-2026-68477Network attack vector

Remote memory corruption via wrong IPv6 offsets

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper IPv6 packet handling in the Linux kernel IPVS component allows remote attackers to corrupt packets via crafted extension headers. The TCP application path uses an IPv4 header length for IPv6 traffic, while ip_vs_out_icmp_v6() passes a fixed IPv6 header size instead of the parsed offset to checksum and NAT logic. Exposure requires an IPVS virtual service processing IPv6 packets with extension headers; consequences include information disclosure, packet-data corruption, connection interruption, or a kernel crash.

CVSS severity9.8
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IPv6 packet handling in the Linux kernel IPVS component allows remote attackers to corrupt packets via crafted extension headers. The TCP application path uses an IPv4 header length for IPv6 traffic, while ip_vs_out_icmp_v6() passes a fixed IPv6 header size instead of the parsed offset to checksum and NAT logic. Exposure requires an IPVS virtual service processing IPv6 packets with extension headers; consequences include information disclosure, packet-data corruption, connection interruption, or a kernel crash.

The record

CVE
CVE-2026-68477
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-354, T1499
Attack vector
network
Privileges
unauthenticated

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=2.6.28
  2. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <3a9dc9b55b53d94613a587604b77d3b20024090c
  3. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <613ce63711b8d431bba90781f133c39a21684f87
  4. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <7350eb7ead172ae8024897d4b0f2e15c5318279c
  5. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <905d7a363ade96a19f214815361e11981142c547
  6. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <95d4511d81b2b37e5d2bdde5d912e48243eae517
  7. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <a3f0d5b605cd5da5c95279969fb8cea4e55cee5b
  8. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <b3fe4cbd583895987935a9bdad01c8f9d3a02310
  9. Affected versionversion=2a3b791e6e1169f374224d164738e9f7be703d77 <d4ec18f48ce78a3bf7c999ac908691007375fe99

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=2a3b791e6e1169f374224d164738e9f7be703d77 <3a9dc9b55b53d94613a587604b77d3b20024090c; version=2a3b791e6e1169f374224d164738e9f7be703d77 <613ce63711b8d431bba90781f133c39a21684f87; version=2a3b791e6e1169f374224d164738e9f7be703d77 <7350eb7ead172ae8024897d4b0f2e15c5318279c; version=2a3b791e6e1169f374224d164738e9f7be703d77 <905d7a363ade96a19f214815361e11981142c547; version=2a3b791e6e1169f374224d164738e9f7be703d77 <95d4511d81b2b37e5d2bdde5d912e48243eae517; version=2a3b791e6e1169f374224d164738e9f7be703d77 <a3f0d5b605cd5da5c95279969fb8cea4e55cee5b; version=2a3b791e6e1169f374224d164738e9f7be703d77 <b3fe4cbd583895987935a9bdad01c8f9d3a02310; version=2a3b791e6e1169f374224d164738e9f7be703d77 <d4ec18f48ce78a3bf7c999ac908691007375fe99

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/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-354Improper Validation of Integrity Check Value
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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