CVE-2026-74515
KVM: s390: pci: Reject adapter interrupt forwarding if already enabled
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its already enabled for the zPCI device. This also fixes overwriting and thus leaking resources when the ioctl is called multiple times for the same device.
INFO
Published Date :
Aug. 15, 2026, 1:17 p.m.
Last Modified :
Aug. 15, 2026, 1:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-74515
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update the Linux kernel to the resolved version.
- Ensure interrupt forwarding is correctly configured.
- Avoid re-enabling interrupt forwarding for zPCI devices.
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-2026-74515.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74515 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-2026-74515
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-2026-74515 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74515 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.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 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': '3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc', 'lessThan': '78d9648e7e960546d5b72504a0b0358cd8bb1e9d', 'versionType': 'git'}, {'status': 'affected', 'version': '3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc', 'lessThan': '6be1ff49ba81f96a6fa55915e6d920be43ac57cc', 'versionType': 'git'}, {'status': 'affected', 'version': '3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc', 'lessThan': '6837f0ae85fd54cf64c8a0c7c530bba2fae0a207', 'versionType': 'git'}, {'status': 'affected', 'version': '3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc', 'lessThan': '591952b63a9f976da7d49f719f36ec826ee2a575', 'versionType': 'git'}, {'status': 'affected', 'version': '3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc', 'lessThan': '8fa01be5a6149404adb82c0979a78f6347edd3ef', 'versionType': 'git'}], 'programFiles': ['arch/s390/kvm/pci.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/s390/kvm/pci.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request to enable interrupt forwarding if its already enabled for the zPCI device. This also fixes overwriting and thus leaking resources when the ioctl is called multiple times for the same device. Added Reference https://git.kernel.org/stable/c/591952b63a9f976da7d49f719f36ec826ee2a575 Added Reference https://git.kernel.org/stable/c/6837f0ae85fd54cf64c8a0c7c530bba2fae0a207 Added Reference https://git.kernel.org/stable/c/6be1ff49ba81f96a6fa55915e6d920be43ac57cc Added Reference https://git.kernel.org/stable/c/78d9648e7e960546d5b72504a0b0358cd8bb1e9d Added Reference https://git.kernel.org/stable/c/8fa01be5a6149404adb82c0979a78f6347edd3ef