CVE-2026-68141
net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()
Description
In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated.
INFO
Published Date :
Aug. 10, 2026, 1:19 p.m.
Last Modified :
Aug. 13, 2026, 11:17 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
- Ensure child socket allocation succeeds before calling iucv_sock_kill.
- Update the Linux kernel to the latest version.
- Apply the provided patch for af_iucv.
- Review connection-refused path logic.
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-2026-68141.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68141 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-2026-68141
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-2026-68141 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68141 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.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 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': '3881ac441f642d56503818123446f7298442236b', 'lessThan': '8bb111f87ded6acb9837ec9b45d6f02cda94c51f', 'versionType': 'git'}, {'status': 'affected', 'version': '3881ac441f642d56503818123446f7298442236b', 'lessThan': '46453b16f38ec7147351f7447e2aec6ea330f7b3', 'versionType': 'git'}, {'status': 'affected', 'version': '3881ac441f642d56503818123446f7298442236b', 'lessThan': '33736ff5e7c97d3348ce812e8bd2e125d840743c', 'versionType': 'git'}, {'status': 'affected', 'version': '3881ac441f642d56503818123446f7298442236b', 'lessThan': '0e857185591fe79934427c9c0c1c31dc776be134', 'versionType': 'git'}, {'status': 'affected', 'version': '3881ac441f642d56503818123446f7298442236b', 'lessThan': '47a5116e56a6b6fe1e909f244e39cd0fc26ceee4', 'versionType': 'git'}], 'programFiles': ['net/iucv/af_iucv.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/iucv/af_iucv.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated. Added Reference https://git.kernel.org/stable/c/0e857185591fe79934427c9c0c1c31dc776be134 Added Reference https://git.kernel.org/stable/c/33736ff5e7c97d3348ce812e8bd2e125d840743c Added Reference https://git.kernel.org/stable/c/46453b16f38ec7147351f7447e2aec6ea330f7b3 Added Reference https://git.kernel.org/stable/c/47a5116e56a6b6fe1e909f244e39cd0fc26ceee4 Added Reference https://git.kernel.org/stable/c/8bb111f87ded6acb9837ec9b45d6f02cda94c51f