{"id":"CVE-2026-97989","revision":"47c84d9bfb0a41a2a4b44b390e05bbc3","records":[{"revision":"47c84d9bfb0a41a2a4b44b390e05bbc3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97989","aliases":[],"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.","state":0,"publishedAt":"2026-09-25T10:23:22.62+00:00","modifiedAt":"2026-10-21T12:53:59.737+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vdpa/vdpa_user/vduse_dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c8a6153b6c59d95c0e091f053f6f180952ade91e\",\n                            \"lessThan\": \"650bac9c73d3b4d83be683028283654c05346556\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8a6153b6c59d95c0e091f053f6f180952ade91e\",\n                            \"lessThan\": \"5d4bdca17d87c90b1d888f8846a781a18aa453c9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8a6153b6c59d95c0e091f053f6f180952ade91e\",\n                            \"lessThan\": \"831dab9b9bcc184adf78f18b5b788316e3174aec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8a6153b6c59d95c0e091f053f6f180952ade91e\",\n                            \"lessThan\": \"c3c3b0839a1197530cc18f535062fc84dbdfc885\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c8a6153b6c59d95c0e091f053f6f180952ade91e\",\n                            \"lessThan\": \"fa2c25b4add57888acfa89e398389e267bff3dcf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/vdpa/vdpa_user/vduse_dev.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.114\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.57\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97989","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97989","identifiers":["CVE-2026-97989"]},"retained":false,"historicalAffected":[]}],"coverage":[]}