Expired Pointer Dereference Affecting kernel-debug-devel package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELDEBUGDEVEL-20347533
- published1 Oct 2026
- disclosed25 Sept 2026
Introduced: 25 Sep 2026
NewCVE-2026-97996 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-debug-devel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel package and not the kernel-debug-devel package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
virtio: fix use-after-free in unregister_virtio_device()
device_unregister() is device_del() plus put_device(). When the caller holds no extra reference, that drops the last one and runs the release callback, which for several transports frees the memory the embedded struct virtio_device sits in. unregister_virtio_device() then calls virtio_debug_device_exit(), which reads dev->debugfs_dir out of the freed object.
Affected transports are the ones whose release callback frees and whose remove path takes no reference: virtio_mmio, virtio_vdpa, virtio_uml, mlxbf-tmfifo and virtio_ccw. virtio_pci is unaffected because virtio_pci_remove() brackets the call with get_device() and put_device().
Remove the debugfs entries before the device can go away. They are only accessed through the protected debugfs interface, so debugfs_remove_recursive() waits for in-progress file operations before returning. Tearing them down while the device is still alive is therefore safe.
Reproduced on User-Mode Linux with CONFIG_KASAN and CONFIG_VIRTIO_DEBUG by unbinding a virtio-uml device:
BUG: KASAN: slab-use-after-free in virtio_debug_device_exit+0x36/0x4d Read of size 8 at addr 00000000616e0b10 by task init/1 __asan_report_load8_noabort virtio_debug_device_exit+0x36/0x4d unregister_virtio_device+0x48/0x75 virtio_uml_remove platform_remove device_release_driver_internal unbind_store
Freed by task 1: kfree virtio_uml_release_dev device_release kobject_put put_device device_unregister
With this applied, the report is gone and unbind is clean.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2541090
- https://access.redhat.com/security/cve/CVE-2026-97996
- https://git.kernel.org/stable/c/3f9a0fceb730f5107d52421ead5568eae25a0049
- https://git.kernel.org/stable/c/77dbd10a701a30fdfea5c3bb7a29163128f9a9c7
- https://git.kernel.org/stable/c/951cad50cba89e736afdee4a730e0e52f9245c9b
- https://git.kernel.org/stable/c/caf042153016d651b55d0fb4a63cdf7d0d23dee2