CVE-2026-97989
UnknownSummary
In the Linux kernel, the vduse module has a bug where virtqueue alignment is not validated. vduse_validate_config() only checks the upper bound of vq_align, so invalid values can reach vring_create_virtqueue_map(). The split-ring helpers use align - 1 as a bit mask, so the alignment must be a non-zero power of two; a zero value makes vring_size() drop the descriptor and available-ring part and vring_init() leave the used ring pointer NULL. Opening a virtio-net device created with vq_align=0 triggers a null-ptr-deref in virtqueue_kick_prepare_split().
Risk Assessment
Can lead to a kernel crash (null-ptr-deref) and denial of service. Affects systems using vduse.
Recommendation
Update the Linux kernel to a version containing the fix that rejects values below VRING_USED_ALIGN_SIZE as well as non-power-of-two values before they reach the virtio ring helpers.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: vduse: validate virtqueue alignment vduse_validate_config() only checks the upper bound of vq_align. Invalid values can therefore reach vring_create_virtqueue_map(). The split-ring helpers use align - 1 as a bit mask, so the alignment must be a non-zero power of two. A zero value makes vring_size() drop the descriptor and available-ring part and vring_init() leave the used ring pointer NULL. The VIRTIO spec requires the used ring to start at an address aligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as well as non-power-of-two values before they reach the virtio ring helpers. Opening a virtio-net device created with vq_align=0 triggered: BUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100 Read of size 2 at addr 0000000000000000 by task systemd-network/1062 Call Trace (relevant frames): dump_stack_lvl print_report kasan_report __asan_load2 virtqueue_kick_prepare_split+0xe3/0x100 virtqueue_kick_prepare+0x40/0x60 try_fill_recv+0x857/0x1250 virtnet_open+0x189/0x460 __dev_open+0x225/0x390 __dev_change_flags+0x368/0x3b0 netif_change_flags+0x56/0xc0 do_setlink.isra.0+0x68c/0x1e30 Validate the value before it reaches the virtio ring helpers.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS