CVE-2026-92521 Affecting kernel-tools-devel package, versions <1:6.1.188-233.385.amzn2023
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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Test your applications- Snyk IDSNYK-AMZN2023-KERNELTOOLSDEVEL-20870298
- published13 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-92521 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel-tools-devel to version 1:6.1.188-233.385.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3197.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
ACPI: PCI: Clear driver_data on all paths that free the acpi_pci_root
acpi_pci_root_add() assigns the freshly allocated root to device->driver_data before dmar_device_add() and pci_acpi_scan_root(). Both failure paths reach the end: label where root is kfree()'d, but only the pci_acpi_scan_root() path clears driver_data first.
When dmar_device_add() fails during a hot-add, root is freed while device->driver_data still points at it. The ACPI core does not clear driver_data on attach failure, so a later acpi_pci_find_root() call may dereference this dangling pointer.
acpi_pci_root_remove() has the same problem: it frees root without clearing device->driver_data, leaving a dangling pointer behind after the root bridge is removed.
Move the NULL assignment to the shared end: label so every error path in acpi_pci_root_add() clears driver_data before freeing root, and clear it in acpi_pci_root_remove() as well, so the object is never left reachable through driver_data after being freed.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92521
- https://git.kernel.org/stable/c/321bb0eb1486a0d575f02e24e3f4170e408c2f51
- https://git.kernel.org/stable/c/3c1e8a14f9d06c1ed6f3e4bd2d283a62079109e2
- https://git.kernel.org/stable/c/3eee4c21931dc048ce63b86809f04e4e6f0dcad5
- https://git.kernel.org/stable/c/6aaf6dbf54fdfae096f3f90a79e9614e46579280
- https://git.kernel.org/stable/c/6e11ac626f9f9fc3a2ed27dfa44ccbe5fb762217
- https://git.kernel.org/stable/c/70cf773cca30a10b4964c24520a71279c974b899
- https://git.kernel.org/stable/c/8a742141f7ab84975aa758b775567ef4740ef0cf
- https://git.kernel.org/stable/c/a285fa3780c768dcc51c76768707d099a2cc611d