CVE-2026-64132Network attack vector

Kernel memory disclosure via stale IOAM pointer

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux Kernel IPv6 IOAM processing allows remote attackers to read kernel memory or crash the host via crafted packets. The ipv6_hop_ioam() path retains hdr across skb_ensure_writable(); when pskb_expand_head() reallocates and frees packet data, hdr remains stale and supplies opt_len to ioam6_event(). Reachability requires IOAM reception on an ingress interface, which is disabled by default, and a cloned packet or insufficient linear headroom that forces buffer reallocation.

CVSS severity9.8
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel IPv6 IOAM processing allows remote attackers to read kernel memory or crash the host via crafted packets. The ipv6_hop_ioam() path retains hdr across skb_ensure_writable(); when pskb_expand_head() reallocates and frees packet data, hdr remains stale and supplies opt_len to ioam6_event(). Reachability requires IOAM reception on an ingress interface, which is disabled by default, and a cloned packet or insufficient linear headroom that forces buffer reallocation.

The record

CVE
CVE-2026-64132
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.9
  2. Affected versionversion=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <24de676da63c1122d2c13b0d546238b66d1b4e62
  3. Affected versionversion=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <5af905aa8e91ff8d94572a1e089558f21dcf24ed
  4. Affected versionversion=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <769723124b7c3b2bfea4cf68ad292698b87c8d01
  5. Affected versionversion=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <e46e6bc97fb1f339730ff1ba74267fbf48e7a422

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.9; version=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <24de676da63c1122d2c13b0d546238b66d1b4e62; version=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <5af905aa8e91ff8d94572a1e089558f21dcf24ed; version=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <769723124b7c3b2bfea4cf68ad292698b87c8d01; version=f655c78d6225f585ef60a9d93ffb79d507ff3ad3 <e46e6bc97fb1f339730ff1ba74267fbf48e7a422

Published CVSS scores

9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8UbuntuCVSS: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 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-825Expired Pointer Dereference
T1190Exploit Public-Facing Application

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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