CVE-2026-63922Network attack vector

Remote kernel memory corruption via stale IPv6 pointer

Published Jul 19, 2026 · Updated Jul 19, 2026

Expired pointer dereference in Linux Kernel IPv6 TLV parsing allows remote attackers to corrupt kernel memory via crafted HAO headers. ip6_parse_tlv() retains nh across ipv6_dest_hao(), whose pskb_expand_head() call can move a cloned packet buffer and leave nh stale for trailing TLVs. Reachability requires CONFIG_IPV6_MIP6 and accepted XFRM processing; consequences include incorrect parsing, kernel-data exposure, memory corruption, or a 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

Expired pointer dereference in Linux Kernel IPv6 TLV parsing allows remote attackers to corrupt kernel memory via crafted HAO headers. ip6_parse_tlv() retains nh across ipv6_dest_hao(), whose pskb_expand_head() call can move a cloned packet buffer and leave nh stale for trailing TLVs. Reachability requires CONFIG_IPV6_MIP6 and accepted XFRM processing; consequences include incorrect parsing, kernel-data exposure, memory corruption, or a crash.

The record

CVE
CVE-2026-63922
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, T1210
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=2.6.19
  2. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <12d957979e4a800167842f1b42be6a606d227ebe
  3. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1
  4. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <751db1b802a067b7fff25880f4e9f9152a171538
  5. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <9b6dcc0a39fd71752937f0b6b3973e1416085dcf
  6. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <f7b52afe3592eae66e160586b45a3f2242972c63
  7. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <f8aabed3ff3e986920cf02a2a2785e08e586b234
  8. Affected versionversion=a831f5bbc89a9978795504be9e1ff412043f8f77 <ff375ed1cba81392346c5bfbf0bb7a13b2946f99

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.19; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <12d957979e4a800167842f1b42be6a606d227ebe; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <751db1b802a067b7fff25880f4e9f9152a171538; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <9b6dcc0a39fd71752937f0b6b3973e1416085dcf; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <f7b52afe3592eae66e160586b45a3f2242972c63; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <f8aabed3ff3e986920cf02a2a2785e08e586b234; version=a831f5bbc89a9978795504be9e1ff412043f8f77 <ff375ed1cba81392346c5bfbf0bb7a13b2946f99

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS: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.

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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
T1210Exploitation of Remote Services

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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