{"id":"CVE-2026-74580","revision":null,"records":[{"revision":"5051ff45b5b94cc09f6d8366f8578f42","observedAt":"2026-10-29T04:47:47.759+00:00","statement":{"source":"cve-program","id":"CVE-2026-74580","aliases":[],"title":"vhost: reset the vring metadata cache on vring reconfiguration","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring\nmetadata region, and iotlb_access_ok() returns early on a cache hit,\ntaking the hit as proof that the region has already been validated:\n\n\tif (vhost_vq_meta_fetch(vq, addr, len, type))\n\t\treturn true;\n\nThe cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on\ndevice IOTLB (re)initialisation and on vq reset, but not when\nVHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when\nVHOST_SET_VRING_NUM changes the region sizes.\n\nWith a device IOTLB attached both ioctls are accepted while the vq is\nlive, and neither validates the addresses at ioctl time: vq_access_ok()\nand vq_log_used_access_ok() return true early because the addresses are\nGIOVAs, deferring validation to prefetch time.  Once the cache has been\npopulated that deferred validation no longer runs -- vq_meta_prefetch()\nhits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps\ntranslating through the old mapping as\n\n\tmap->addr + addr - map->start\n\nfor an address the mapping no longer covers.  vhost_copy_to_user() and\nvhost_copy_from_user() consume the result with __copy_to_user() and\n__copy_from_user(), which do not check it either, so a subsequent used\nring update or descriptor fetch accesses memory outside the region the\nIOTLB actually maps.\n\nReset the metadata cache whenever the vring is reconfigured, so the new\naddresses are pushed back through iotlb_access_ok()'s slow path.","state":0,"publishedAt":"2026-08-21T16:31:54.076+00:00","modifiedAt":"2026-10-29T03:57:01.255+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/vhost.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"5224bd37e37d36076a550d99b2aebba33939fd95\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"54617e9119be2eb728ecdd8d977b99c99d4c498a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"13fa6f32a56a386a82bd7451644c494beed034af\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"6fa3e9b1fe856259555a7e22f3f3082e7827fd9b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"b70ebe0bba254e093dd5fd4c0c170941ce83eb85\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\n                            \"lessThan\": \"de845981da67a6b049080c87e605130b0c30adc5\",\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/vhost.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.11\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.11\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.152\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.104\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.45\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.9\",\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:L/UI:N/S:C/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95","https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a","https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af","https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7","https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b","https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6","https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85","https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74580","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74580","identifiers":["CVE-2026-74580"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-07T08:26:54.7587124+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-07T08:26:54.7587124+00:00","lastSuccessAt":"2026-11-07T08:26:54.9358449+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.935846+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-bb5c9d5a08063ef076042e33dd72a7d0ffa4c4487efdcf3106e29ba55ec2ad57-e2c080f02357fa2a3d144a661c51c212b571c4d7ae811251058237d8f5735e04","complete":true,"records":420765,"lastAttemptAt":"2026-11-07T08:26:54.254429+00:00","lastSuccessAt":"2026-11-07T07:27:09.4258602+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.254429+00:00","snapshotPublishedAt":"2026-11-07T07:18:10+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. 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-a62e0f5120334284beb3f9889cd2a2da","complete":true,"records":13631,"lastAttemptAt":"2026-11-07T08:37:59.5911353+00:00","lastSuccessAt":"2026-11-07T08:37:59.587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:37:59.587+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-07T08:26:54.7587124+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-07T08:26:54.7587124+00:00","lastSuccessAt":"2026-11-07T08:26:54.9369587+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.9369591+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. No reader inventory is sent.","generation":"enrichment-1262a9fa83024e28a1560dfc0c9cdf3c","complete":true,"records":13645,"lastAttemptAt":"2026-11-07T08:26:55.5034845+00:00","lastSuccessAt":"2026-11-07T06:27:08.533+00:00","error":null,"lastVerifiedAt":"2026-11-07T06:27:08.533+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13685,"expectedIdentifiers":13685,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-0eb4d6dde62dffacd040ad992d4fd5a65cd7d0dc5f5f4cfa8b41967fc6f9ca5f","complete":true,"records":9914,"lastAttemptAt":"2026-11-07T08:26:54.6164924+00:00","lastSuccessAt":"2026-11-06T20:10:36.6450506+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.6164924+00:00","snapshotPublishedAt":"2026-11-06T20:02:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-07T08:26:54.41227+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.41227+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-335633e78a15c9cde10a6025895b5617717087fb945489ae7e15d377bacf34a9","complete":true,"records":3055,"lastAttemptAt":"2026-11-07T08:26:54.7201545+00:00","lastSuccessAt":"2026-11-06T16:03:00.7615789+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.7201545+00:00","snapshotPublishedAt":"2026-11-06T16:02:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-a0b728bc1c5526b5429930c00621636eba8655069c176697c3080f8377619ad7","complete":true,"records":231291,"lastAttemptAt":"2026-11-07T08:26:54.517176+00:00","lastSuccessAt":"2026-11-07T00:28:51.1983528+00:00","error":null,"lastVerifiedAt":"2026-11-07T08:26:54.517176+00:00","snapshotPublishedAt":"2026-11-06T23:33:08+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}