{"id":"CVE-2026-74310","revision":null,"records":[{"revision":"b8665a6c99494135ba50d04f3cf723eb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74310","aliases":[],"title":"vhost/net: complete zerocopy ubufs only once","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost/net: complete zerocopy ubufs only once\n\nvhost-net initializes one ubuf_info per outstanding zerocopy TX\ndescriptor and hands it to the backend socket. The networking stack may\nthen clone a zerocopy skb before all skb references are released. For\nexample, batman-adv fragmentation reaches skb_split(), which calls\nskb_zerocopy_clone() and increments the same ubuf_info refcount.\n\nvhost_zerocopy_complete() currently treats every ubuf callback as a\ncompleted vhost descriptor. It dereferences ubuf->ctx, writes the\ndescriptor completion state, and drops the vhost_net_ubuf_ref even when\nthe callback only releases a cloned skb reference. A backend reset can\ntherefore wait for and free the vhost_net_ubuf_ref while another cloned\nskb still carries the same ubuf_info. A later completion then\ndereferences the freed ubufs pointer.\n\nKASAN reports the stale completion as:\n\n BUG: KASAN: slab-use-after-free in vhost_zerocopy_complete+0x1d7/0x1f0\n BUG: KASAN: slab-use-after-free in vhost_zerocopy_complete+0x101/0x1f0\n vhost_zerocopy_complete\n skb_copy_ubufs\n __dev_forward_skb2\n veth_xmit\n\nThe freed object was allocated from vhost_net_ioctl() while setting the\nbackend and freed through kfree_rcu()/kvfree_rcu_bulk after backend\nremoval, while delayed skb completion still reached\nvhost_zerocopy_complete().\n\nHonor the generic ubuf_info refcount before touching vhost state, and run\nthe vhost descriptor completion only for the final ubuf reference. This\nmatches the msg_zerocopy_complete() ownership rule for cloned zerocopy\nskbs.","state":0,"publishedAt":"2026-08-15T05:58:10.043+00:00","modifiedAt":"2026-10-16T18:55:32.036+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/vhost/net.c\"\n ],\n \"versions\": [\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"ea71f873423fb73e66ad88936d6759ac0ad4aa53\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"6445b945024f4c7675ae5352b2d5885cb1deea71\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"a9f8a1d2e3ff511eafd4c5462481950c2f4d2b5d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"321c73baf54d971ce3771fea275c98a247f7ee35\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"c069437924663539a93a1e5afe90838d9ccee284\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bab632d69ee48a106e779b60cc01adfe80a72807\",\n \"lessThan\": \"8f6898fe80794f2d7c3d38c1158c806e4074a1c4\",\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/vhost/net.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.1\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.1\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/ea71f873423fb73e66ad88936d6759ac0ad4aa53","https://git.kernel.org/stable/c/6445b945024f4c7675ae5352b2d5885cb1deea71","https://git.kernel.org/stable/c/a9f8a1d2e3ff511eafd4c5462481950c2f4d2b5d","https://git.kernel.org/stable/c/321c73baf54d971ce3771fea275c98a247f7ee35","https://git.kernel.org/stable/c/c069437924663539a93a1e5afe90838d9ccee284","https://git.kernel.org/stable/c/8f6898fe80794f2d7c3d38c1158c806e4074a1c4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74310","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74310","identifiers":["CVE-2026-74310"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-e09ba3aeac6342a2aec1523a49bbcddb","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T09:08:51.4796631+00:00","lastSuccessAt":"2026-11-09T09:08:51.5395153+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:08:51.5395153+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.197028+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.1970284+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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