CVE-2026-93827
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel virtio-fs, virtio_fs_setup_vqs() frees fs->vqs and fs->mq_map on the error path, then virtio_fs_ktype_release() frees them again, causing a double-free and dangling pointers. The fix sets the pointers to NULL after kfree() so the later release is harmless. This can be triggered when a broken virtio-fs device advertises more request queues than the transport provides.
Risk Assessment
A double-free in kernel context can lead to memory corruption, system crash, or potential privilege escalation. This affects systems using virtio-fs.
Recommendation
Update the Linux kernel to a version containing the fix. Avoid using untrusted or broken virtio-fs devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: virtio-fs: avoid double-free on failed queue setup virtio_fs_setup_vqs() allocates fs->vqs and fs->mq_map before calling virtio_find_vqs(). If virtio_find_vqs() fails, the error path frees both pointers and returns an error to virtio_fs_probe(). virtio_fs_probe() then drops the last kobject reference, and virtio_fs_ktype_release() frees fs->vqs and fs->mq_map again. This leaves dangling pointers in struct virtio_fs and can trigger a double-free during probe failure cleanup. Set fs->vqs and fs->mq_map to NULL immediately after kfree() in the virtio_fs_setup_vqs() error path so that the later kobject release sees an uninitialized state and kfree(NULL) becomes harmless. This can be reproduced when a broken virtio-fs device advertises more request queues than the transport actually provides. In that case virtio_find_vqs() fails while setting up the extra queue, and the probe path reaches the double-free cleanup sequence.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS