{"id":"CVE-2026-97989","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: validate virtqueue alignment\n\nvduse_validate_config() only checks the upper bound of vq_align","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: validate virtqueue alignment\n\nvduse_validate_config() only checks the upper bound of vq_align. Invalid\nvalues can therefore reach vring_create_virtqueue_map(). T…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c8a6153b6c59d95c0e091f053f6f180952ade91e < c3c3b0839a1197530cc18f535062fc84dbdfc885","Linux >= c8a6153b6c59d95c0e091f053f6f180952ade91e < fa2c25b4add57888acfa89e398389e267bff3dcf","Linux 5.15"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:27.010","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97989","references":[{"url":"https://git.kernel.org/stable/c/c3c3b0839a1197530cc18f535062fc84dbdfc885","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fa2c25b4add57888acfa89e398389e267bff3dcf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.865Z","slug":"CVE-2026-97989","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvduse: validate virtqueue alignment\n\nvduse_validate_config() only checks the upper bound of vq_align. Invalid\nvalues can therefore reach vring_create_virtqueue_map(). The split-ring\nhelpers use align - 1 as a bit mask, so the alignment must be a non-zero\npower of two. A zero value makes vring_size() drop the descriptor and\navailable-ring part and vring_init() leave the used ring pointer NULL.\n\nThe VIRTIO spec requires the used ring to start at an address\naligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as\nwell as non-power-of-two values before they reach the virtio ring helpers.\n\nOpening a virtio-net device created with vq_align=0 triggered:\n\nBUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100\nRead of size 2 at addr 0000000000000000 by task systemd-network/1062\n\nCall Trace (relevant frames):\n dump_stack_lvl\n print_report\n kasan_report\n __asan_load2\n virtqueue_kick_prepare_split+0xe3/0x100\n virtqueue_kick_prepare+0x40/0x60\n try_fill_recv+0x857/0x1250\n virtnet_open+0x189/0x460\n __dev_open+0x225/0x390\n __dev_change_flags+0x368/0x3b0\n netif_change_flags+0x56/0xc0\n do_setlink.isra.0+0x68c/0x1e30\n\nValidate the value before it reaches the virtio ring helpers.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}