Vulnerability-Lookup

CVE-2026-74580 (GCVE-0-2026-74580)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-08-25 05:40

Title

vhost: reset the vring metadata cache on vring reconfiguration

Summary

In the Linux kernel, the following vulnerability has been resolved: vhost: reset the vring metadata cache on vring reconfiguration vq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring metadata region, and iotlb_access_ok() returns early on a cache hit, taking the hit as proof that the region has already been validated: if (vhost_vq_meta_fetch(vq, addr, len, type)) return true; The cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on device IOTLB (re)initialisation and on vq reset, but not when VHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when VHOST_SET_VRING_NUM changes the region sizes. With a device IOTLB attached both ioctls are accepted while the vq is live, and neither validates the addresses at ioctl time: vq_access_ok() and vq_log_used_access_ok() return true early because the addresses are GIOVAs, deferring validation to prefetch time. Once the cache has been populated that deferred validation no longer runs -- vq_meta_prefetch() hits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps translating through the old mapping as map->addr + addr - map->start for an address the mapping no longer covers. vhost_copy_to_user() and vhost_copy_from_user() consume the result with __copy_to_user() and __copy_from_user(), which do not check it either, so a subsequent used ring update or descriptor fetch accesses memory outside the region the IOTLB actually maps. Reset the metadata cache whenever the vring is reconfigured, so the new addresses are pushed back through iotlb_access_ok()'s slow path.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/5224bd37e37d36076…
https://git.kernel.org/stable/c/54617e9119be2eb72…
https://git.kernel.org/stable/c/13fa6f32a56a386a8…
https://git.kernel.org/stable/c/cf363a7a02ce132ef…
https://git.kernel.org/stable/c/6fa3e9b1fe8562595…
https://git.kernel.org/stable/c/f1e21108e3ddfcce6…
https://git.kernel.org/stable/c/b70ebe0bba254e093…
https://git.kernel.org/stable/c/de845981da67a6b04…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < 5224bd37e37d36076a550d99b2aebba33939fd95 (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < 54617e9119be2eb728ecdd8d977b99c99d4c498a (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < 13fa6f32a56a386a82bd7451644c494beed034af (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7 (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < 6fa3e9b1fe856259555a7e22f3f3082e7827fd9b (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6 (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < b70ebe0bba254e093dd5fd4c0c170941ce83eb85 (git) Affected: f889491380582b4ba2981cf0b0d7d6a40fb30ab7 , < de845981da67a6b049080c87e605130b0c30adc5 (git)	guessed
Linux	Linux	Affected: 4.11 Unaffected: 0 , < 4.11 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

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          "programFiles": [
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              "status": "unaffected",
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              "versionType": "semver"
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              "version": "5.10.265",
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            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
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              "status": "unaffected",
              "version": "7.1.9",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq-\u003emeta_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-\u003edesc, vq-\u003eavail and vq-\u003eused, 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-\u003eaddr + addr - map-\u003estart\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()\u0027s slow path."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires ioctl on /dev/vhost-net or /dev/vhost-vsock (VHOST_SET_OWNER, VHOST_SET_FEATURES with VIRTIO_F_ACCESS_PLATFORM, VHOST_SET_VRING_ADDR, IOTLB updates); although virtio kicks and network I/O trigger the corrupting copies, the stale-cache state is created only through local vhost character-device syscalls, not remote packets.\nAC:L - An attacker who controls the vhost owner process can deterministically populate meta_iotlb via normal virtqueue traffic, issue VHOST_SET_VRING_ADDR with new GIOVAs while the backend is live, then trigger descriptor/used-ring access; no races, special heap layout, or victim timing are required.\nPR:L - No host root is needed: exploitation is performed by the vhost device owner (standard libvirt/QEMU kvm-group account) or, in the highest-impact cloud scenario, an authorized malicious VM tenant whose virtio traffic drives vhost workers after QEMU updates live vring addresses under VIRTIO_F_ACCESS_PLATFORM.\nUI:N - No end-user or administrator action is required beyond routine automated VM operation (virtio I/O, vhost backend attachment, and vring setup) that the attacker or tenant controls directly.\nS:C - Stale IOTLB metadata translation makes the host kernel read/write outside the mapped vring regions in the VMM userspace address space (QEMU), crossing the guest-to-host virtualization boundary\u2014the same escape class as CVE-2025-38074, not mere in-guest kernel impact.\nC:H - vhost_copy_from_user and __vhost_get_user use vhost_vq_meta_fetch\u0027s stale map-\u003eaddr+addr-map-\u003estart translation without bounds checks, enabling out-of-bounds reads of adjacent VMM memory during descriptor and avail-ring fetches (arbitrary misdirected kernel reads from host userspace).\nI:H - vhost_copy_to_user and vhost_put_user write used-ring entries through the same stale translation, giving controlled out-of-bounds writes into the VMM process that can corrupt QEMU heap, IOTLB tables, or migration metadata for code-execution primitives.\nA:H - Misdirected __copy_to_user/__copy_from_user against unmapped or invalid VMM addresses can fault the vhost worker (host kernel oops/panic), and corrupting VMM control structures reliably crashes or kills the hypervisor process, terminating the VM."
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        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a"
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        {
          "url": "https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af"
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        {
          "url": "https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7"
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        },
        {
          "url": "https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5"
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      ],
      "title": "vhost: reset the vring metadata cache on vring reconfiguration",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74580",
    "datePublished": "2026-08-21T16:31:54.076Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:06.380Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74580",
      "date": "2026-08-24",
      "epss": "0.00165",
      "percentile": "0.05903"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:43:49.000Z",
      "cve": "CVE-2026-74580",
      "id": "msrc_CVE-2026-74580",
      "initial_release_date": "2026-08-23T01:03:08.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "vhost: reset the vring metadata cache on vring reconfiguration",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74580.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74580\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-21T17:16:44.210\",\"lastModified\":\"2026-08-25T06:18:30.997\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvhost: reset the vring metadata cache on vring reconfiguration\\n\\nvq-\u003emeta_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-\u003edesc, vq-\u003eavail and vq-\u003eused, 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-\u003eaddr + addr - map-\u003estart\\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()\u0027s slow path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/vhost/vhost.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"5224bd37e37d36076a550d99b2aebba33939fd95\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"54617e9119be2eb728ecdd8d977b99c99d4c498a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"13fa6f32a56a386a82bd7451644c494beed034af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"6fa3e9b1fe856259555a7e22f3f3082e7827fd9b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"b70ebe0bba254e093dd5fd4c0c170941ce83eb85\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f889491380582b4ba2981cf0b0d7d6a40fb30ab7\",\"lessThan\":\"de845981da67a6b049080c87e605130b0c30adc5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/vhost/vhost.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T06:02:22+00:00",
      "cve": "CVE-2026-74580",
      "id": "CVE-2026-74580",
      "initial_release_date": "2026-08-21T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vhost: reset the vring metadata cache on vring reconfiguration",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74580.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-22T16:28:22Z",
      "cve": "CVE-2026-74580",
      "id": "CVE-2026-74580",
      "initial_release_date": "2026-08-22T00:52:36Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74580",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74580.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2026-74580

Vulnerability from fkie_nvd - Published: 2026-08-21 17:16 - Updated: 2026-08-25 06:18

Severity

8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vhost/vhost.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5224bd37e37d36076a550d99b2aebba33939fd95",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "54617e9119be2eb728ecdd8d977b99c99d4c498a",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "13fa6f32a56a386a82bd7451644c494beed034af",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "6fa3e9b1fe856259555a7e22f3f3082e7827fd9b",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "b70ebe0bba254e093dd5fd4c0c170941ce83eb85",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            },
            {
              "lessThan": "de845981da67a6b049080c87e605130b0c30adc5",
              "status": "affected",
              "version": "f889491380582b4ba2981cf0b0d7d6a40fb30ab7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vhost/vhost.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.11"
            },
            {
              "lessThan": "4.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq-\u003emeta_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-\u003edesc, vq-\u003eavail and vq-\u003eused, 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-\u003eaddr + addr - map-\u003estart\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()\u0027s slow path."
    }
  ],
  "id": "CVE-2026-74580",
  "lastModified": "2026-08-25T06:18:30.997",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 6.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-21T17:16:44.210",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-MR6W-HQP3-CG59

Vulnerability from github – Published: 2026-08-21 18:34 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

vhost: reset the vring metadata cache on vring reconfiguration

vq->meta_iotlb[] caches the vhost_iotlb_map that backs each vring metadata region, and iotlb_access_ok() returns early on a cache hit, taking the hit as proof that the region has already been validated:

if (vhost_vq_meta_fetch(vq, addr, len, type))
    return true;

The cache is reset on VHOST_IOTLB_UPDATE and VHOST_IOTLB_INVALIDATE, on device IOTLB (re)initialisation and on vq reset, but not when VHOST_SET_VRING_ADDR replaces vq->desc, vq->avail and vq->used, nor when VHOST_SET_VRING_NUM changes the region sizes.

With a device IOTLB attached both ioctls are accepted while the vq is live, and neither validates the addresses at ioctl time: vq_access_ok() and vq_log_used_access_ok() return true early because the addresses are GIOVAs, deferring validation to prefetch time. Once the cache has been populated that deferred validation no longer runs -- vq_meta_prefetch() hits the stale entry and returns true -- and vhost_vq_meta_fetch() keeps translating through the old mapping as

map->addr + addr - map->start

for an address the mapping no longer covers. vhost_copy_to_user() and vhost_copy_from_user() consume the result with __copy_to_user() and __copy_from_user(), which do not check it either, so a subsequent used ring update or descriptor fetch accesses memory outside the region the IOTLB actually maps.

Reset the metadata cache whenever the vring is reconfigured, so the new addresses are pushed back through iotlb_access_ok()'s slow path.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74580"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-21T17:16:44Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: reset the vring metadata cache on vring reconfiguration\n\nvq-\u003emeta_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-\u003edesc, vq-\u003eavail and vq-\u003eused, 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-\u003eaddr + addr - map-\u003estart\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()\u0027s slow path.",
  "id": "GHSA-mr6w-hqp3-cg59",
  "modified": "2026-08-25T06:31:21Z",
  "published": "2026-08-21T18:34:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74580"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13fa6f32a56a386a82bd7451644c494beed034af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5224bd37e37d36076a550d99b2aebba33939fd95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54617e9119be2eb728ecdd8d977b99c99d4c498a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fa3e9b1fe856259555a7e22f3f3082e7827fd9b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b70ebe0bba254e093dd5fd4c0c170941ce83eb85"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf363a7a02ce132ef1f58084fdb13e1a3b7da7e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de845981da67a6b049080c87e605130b0c30adc5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1e21108e3ddfcce62f6cad4ebd7b5674543c9e6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-74580

Vulnerability from csaf_microsoft - Published: 2026-08-23 01:03 - Updated: 2026-08-24 14:43

Summary

vhost: reset the vring metadata cache on vring reconfiguration

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-74580

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-74580 vhost: reset the vring metadata cache on vring reconfiguration - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74580.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "vhost: reset the vring metadata cache on vring reconfiguration",
    "tracking": {
      "current_release_date": "2026-08-24T14:43:49.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.239Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-74580",
      "initial_release_date": "2026-08-23T01:03:08.000Z",
      "revision_history": [
        {
          "date": "2026-08-23T01:03:08.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:43:49.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.150.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-74580",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-74580 vhost: reset the vring metadata cache on vring reconfiguration - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74580.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-23T01:03:08.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "vhost: reset the vring metadata cache on vring reconfiguration"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74580 (GCVE-0-2026-74580)

FKIE_CVE-2026-74580

GHSA-MR6W-HQP3-CG59

MSRC_CVE-2026-74580

Tags

Sightings

Nomenclature