{"id":"CVE-2026-97989","state":"PUBLISHED","title":"vduse: validate virtqueue alignment","description":"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(). 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.","publishedAt":"2026-09-25T10:23:22.620Z","updatedAt":"2026-10-21T12:53:59.737Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"650bac9c73d3b4d83be683028283654c05346556","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"5d4bdca17d87c90b1d888f8846a781a18aa453c9","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"831dab9b9bcc184adf78f18b5b788316e3174aec","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"c3c3b0839a1197530cc18f535062fc84dbdfc885","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"fa2c25b4add57888acfa89e398389e267bff3dcf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vdpa/vdpa_user/vduse_dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vdpa/vdpa_user/vduse_dev.c"]}],"references":["https://git.kernel.org/stable/c/650bac9c73d3b4d83be683028283654c05346556","https://git.kernel.org/stable/c/5d4bdca17d87c90b1d888f8846a781a18aa453c9","https://git.kernel.org/stable/c/831dab9b9bcc184adf78f18b5b788316e3174aec","https://git.kernel.org/stable/c/c3c3b0839a1197530cc18f535062fc84dbdfc885","https://git.kernel.org/stable/c/fa2c25b4add57888acfa89e398389e267bff3dcf"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97989.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97989","state":"PUBLISHED","datePublished":"2026-09-25T10:23:22.620Z","dateUpdated":"2026-10-21T12:53:59.737Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:18:58.209Z"},"containers":{"cna":{"title":"vduse: validate virtqueue alignment","descriptions":[{"lang":"en","value":"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(). 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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"650bac9c73d3b4d83be683028283654c05346556","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"5d4bdca17d87c90b1d888f8846a781a18aa453c9","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"831dab9b9bcc184adf78f18b5b788316e3174aec","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"c3c3b0839a1197530cc18f535062fc84dbdfc885","versionType":"git"},{"version":"c8a6153b6c59d95c0e091f053f6f180952ade91e","status":"affected","lessThan":"fa2c25b4add57888acfa89e398389e267bff3dcf","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vdpa/vdpa_user/vduse_dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/vdpa/vdpa_user/vduse_dev.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/650bac9c73d3b4d83be683028283654c05346556"},{"url":"https://git.kernel.org/stable/c/5d4bdca17d87c90b1d888f8846a781a18aa453c9"},{"url":"https://git.kernel.org/stable/c/831dab9b9bcc184adf78f18b5b788316e3174aec"},{"url":"https://git.kernel.org/stable/c/c3c3b0839a1197530cc18f535062fc84dbdfc885"},{"url":"https://git.kernel.org/stable/c/fa2c25b4add57888acfa89e398389e267bff3dcf"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:53:59.737Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}