Improper Access Control Affecting torvalds/linux package, versions [6.0,6.1.188)[6.2,6.6.157)[6.7,6.12.110)[6.13,6.18.51)[6.19,7.2.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Oct 2026
- disclosed16 Sept 2026
- creditUnknown
Introduced: 16 Sep 2026
CVE-2026-89957 (opens in a new tab)How to fix?
Upgrade torvalds/linux to version 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or higher.
Overview
Affected versions of this package are vulnerable to Improper Access Control in the vfio_ap_mdev_hot_unplug_cfg process. An attacker can maintain unauthorized access to cryptographic hardware resources by removing the last assigned adapter or domain from the host configuration, which causes the guest to retain access to hardware that should have been revoked. This allows the attacker to access sensitive cryptographic data, modify hardware queue states, and potentially disrupt cryptographic services for other users or the host.
Note: The Linux kernel project assigns a CVE to every bug fix it ships, whether or not the bug has been shown to be exploitable. This advisory was generated from that process and has not been individually assessed for exploitability. See the kernel's CVE process documentation: https://github.com/torvalds/linux/blob/master/Documentation/process/cve.rst