CVE-2026-63919
xfrm: input: hold netns during deferred transport reinjection
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net().
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 27, 2026, 5:44 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Take a netns reference when queueing deferred reinjection work.
- Drop netns reference after the callback completes.
- Use maybe_get_net() for namespace handling.
- Apply Linux kernel updates.
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-2026-63919.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63919 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-2026-63919
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-2026-63919 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63919 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. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/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': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '7ee59eda8820b758ed29e1cd3222359c7b97302c', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '2df7059a18afb7d3aee6c36cad5d371c198111d4', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '8dfabcba6a943a7a02ebe1e1637c361ba96acbaa', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '48ce101cd630d6745b6923b5bad8358bc4c119da', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '55ddfc41451f01c588089cd74957a05311b6f202', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '9f7ebb45a83afc3216e855e57d51bb4bc9b5232e', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': '9f67a36e91bb50d358760f381f233913fe5c09f8', 'versionType': 'git'}, {'status': 'affected', 'version': '7b3801927e52f8621de311277f7fc727635019e7', 'lessThan': 'c16f74dc1d75d0e2e7670076d5375deda110ebeb', 'versionType': 'git'}], 'programFiles': ['net/xfrm/xfrm_input.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.6'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.6', '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/xfrm/xfrm_input.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net(). Added Reference https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4 Added Reference https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da Added Reference https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202 Added Reference https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c Added Reference https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa Added Reference https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8 Added Reference https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e Added Reference https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb