CVE-2026-74669Network attack vector

Kernel stack corruption via stale IPv4 option metadata

Published Aug 22, 2026 · Updated Aug 25, 2026

Stack out-of-bounds write in Linux kernel IPVS allows remote attackers to corrupt kernel stack memory through crafted tunnel ICMP errors. After ip_vs_in_icmp() rebases the packet, IPCB(skb)->opt retains an outer-header timestamp offset, so __ip_options_echo() uses transport data as a length and copies it into fixed-size stack storage. The IPVS tunnel ICMP error path must process an outer IPv4 timestamp option; the demonstrated result is a KASAN-detected stack overwrite.

CVSS severity9.8
Critical
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

Stack out-of-bounds write in Linux kernel IPVS allows remote attackers to corrupt kernel stack memory through crafted tunnel ICMP errors. After ip_vs_in_icmp() rebases the packet, IPCB(skb)->opt retains an outer-header timestamp offset, so __ip_options_echo() uses transport data as a length and copies it into fixed-size stack storage. The IPVS tunnel ICMP error path must process an outer IPv4 timestamp option; the demonstrated result is a KASAN-detected stack overwrite.

The record

CVE
CVE-2026-74669
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=3.7
  2. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <37c61b3745129cbd682c557b51345828120972e5
  3. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <384b4dae14277d369221d187e9b3af56c79d2e50
  4. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <6f46fc460e9316062bdcdf89199eb5d7a33da33b
  5. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <75eec935444db4af2123e0491936f6e273d7ea00
  6. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <79ffa99202c944467e28b13b513bf2998732edff
  7. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <c9413b50204738fbc429bb86bf01353c393a6c28
  8. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <e0ba936287dfe9783426aac27e5fd76fe35b38c9
  9. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <ed246dd85ebf27c1f6b7897834d40786c0ca3006

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <37c61b3745129cbd682c557b51345828120972e5; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <384b4dae14277d369221d187e9b3af56c79d2e50; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <6f46fc460e9316062bdcdf89199eb5d7a33da33b; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <75eec935444db4af2123e0491936f6e273d7ea00; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <79ffa99202c944467e28b13b513bf2998732edff; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <c9413b50204738fbc429bb86bf01353c393a6c28; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <e0ba936287dfe9783426aac27e5fd76fe35b38c9; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <ed246dd85ebf27c1f6b7897834d40786c0ca3006

Published CVSS scores

9.8CanonicalCVSS:3.1/AV:N/AC:L/PR:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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