9.8
CRITICAL
CVSS 3.1
CVE-2026-63922
ipv6: exthdrs: refresh nh after handling HAO option
Overview
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.
Details
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 28, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Update the Linux kernel to fix memory corruption issues in IPv6 header parsing.
- Update the Linux kernel to the latest stable version.
- Apply the relevant security patches for IPv6.
- Rebuild and deploy the kernel.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63922.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63922 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63922
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63922 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63922 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 28, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/b3ac54e5c905f86d22b502eacb5686a282c5659f Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f8aabed3ff3e986920cf02a2a2785e08e586b234', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '12d957979e4a800167842f1b42be6a606d227ebe', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'ff375ed1cba81392346c5bfbf0bb7a13b2946f99', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '751db1b802a067b7fff25880f4e9f9152a171538', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '9b6dcc0a39fd71752937f0b6b3973e1416085dcf', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f7b52afe3592eae66e160586b45a3f2242972c63', 'versionType': 'git'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'b3ac54e5c905f86d22b502eacb5686a282c5659f', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f8aabed3ff3e986920cf02a2a2785e08e586b234', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '12d957979e4a800167842f1b42be6a606d227ebe', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'ff375ed1cba81392346c5bfbf0bb7a13b2946f99', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '751db1b802a067b7fff25880f4e9f9152a171538', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '9b6dcc0a39fd71752937f0b6b3973e1416085dcf', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f7b52afe3592eae66e160586b45a3f2242972c63', 'versionType': 'git'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f8aabed3ff3e986920cf02a2a2785e08e586b234', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '12d957979e4a800167842f1b42be6a606d227ebe', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'ff375ed1cba81392346c5bfbf0bb7a13b2946f99', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '751db1b802a067b7fff25880f4e9f9152a171538', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': '9b6dcc0a39fd71752937f0b6b3973e1416085dcf', 'versionType': 'git'}, {'status': 'affected', 'version': 'a831f5bbc89a9978795504be9e1ff412043f8f77', 'lessThan': 'f7b52afe3592eae66e160586b45a3f2242972c63', 'versionType': 'git'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.19'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.19', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.93', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.35', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.12', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/exthdrs.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage. Added Reference https://git.kernel.org/stable/c/12d957979e4a800167842f1b42be6a606d227ebe Added Reference https://git.kernel.org/stable/c/1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 Added Reference https://git.kernel.org/stable/c/751db1b802a067b7fff25880f4e9f9152a171538 Added Reference https://git.kernel.org/stable/c/9b6dcc0a39fd71752937f0b6b3973e1416085dcf Added Reference https://git.kernel.org/stable/c/f7b52afe3592eae66e160586b45a3f2242972c63 Added Reference https://git.kernel.org/stable/c/f8aabed3ff3e986920cf02a2a2785e08e586b234 Added Reference https://git.kernel.org/stable/c/ff375ed1cba81392346c5bfbf0bb7a13b2946f99
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.