CVE-2026-45862 (GCVE-0-2026-45862)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:15 – Updated: 2026-08-05 12:28
VLAI
Title
iommu/vt-d: Flush cache for PASID table before using it
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7e00b52c8cdd9d3a985d63d72ecae7bde6314883 , < cd75e77125c8a51754ca4cd60b4ca083ed735d1d (git)
Affected: 5c65f097124770c3e5b9b83ed1a8b68c119bc7b5 , < 0616137b70e6d9a547d4b60df8e1b64e36d83661 (git)
Affected: 2bed9455db7cc0ab7ece6b3d846472097b52855a , < 36990407cdd257473607e33802d00e978af2759e (git)
Affected: 194b3348bdbb7db65375c72f3f774aee4cc6614e , < c93f23375d8c410954b0df825e814b632fd62b9d (git)
Affected: 194b3348bdbb7db65375c72f3f774aee4cc6614e , < 5962c30a6f05ea1ab73f039e235bb30716243517 (git)
Affected: 194b3348bdbb7db65375c72f3f774aee4cc6614e , < 36244dfd3853f7bf89d03b8e90d56b23ce7fbc16 (git)
Affected: 194b3348bdbb7db65375c72f3f774aee4cc6614e , < d15cda135148ea7ba929cfdbcf208182bc29a7aa (git)
Affected: 194b3348bdbb7db65375c72f3f774aee4cc6614e , < 22d169bdd2849fe6bd18c2643742e1c02be6451c (git)
Affected: 1b48c70feefc499b62670521efa002ab01e05df5 (git)
Affected: bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf (git)
Affected: 5.10.175 , < 5.10.252 (semver)
Affected: 5.15.103 , < 5.15.202 (semver)
Affected: 6.1.16 , < 6.1.165 (semver)
Affected: 5.4.237 , < 5.5 (semver)
Affected: 6.2.3 , < 6.3 (semver)
Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - The vulnerable PASID-table allocation is reached locally via IOMMU domain attach (SVA bind through an accelerator device, or guest/IOMMUFD device setup) using syscalls/ioctls; there is no network-facing path to this code.\nAC:H - Exploitation requires non-coherent VT-d hardware and winning a nanosecond-scale cache-writeback race in which the IOMMU must read the entry before the CPU flushes the zeroes to RAM, with the stale data happening to form a usable present entry \u2014 conditions governed by microarchitectural timing the attacker cannot control.\nPR:L - An unprivileged local user with access to an SVA-capable accelerator device can drive `iommu_sva_bind_device` to trigger the PASID-table allocation while controlling the device\u0027s DMA; no real root is required.\nUI:N - The allocation and the device DMA are driven entirely by the attacker; no victim interaction is needed.\nS:C - The IOMMU enforces the DMA isolation boundary; using stale garbage PASID entries lets a device\u0027s DMA escape its assigned domain, impacting host physical memory in a different security authority \u2014 an IOMMU/DMA boundary bypass.\nC:H - A misdirected DMA translated through a garbage page table can read arbitrary host physical memory, yielding disclosure beyond the device\u0027s domain.\nI:H - The same misdirected DMA path provides write access to arbitrary host physical memory, allowing corruption of kernel data outside the device\u0027s intended domain.\nA:H - Garbage PASID entries can cause IOMMU faults, DMA failures, and memory corruption leading to oops/panic or device/system hangs."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45862\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:16:58.430\",\"lastModified\":\"2026-06-25T21:07:19.617\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\niommu/vt-d: Flush cache for PASID table before using it\\n\\nWhen writing the address of a freshly allocated zero-initialized PASID\\ntable to a PASID directory entry, do that after the CPU cache flush for\\nthis PASID table, not before it, to avoid the time window when this\\nPASID table may be already used by non-coherent IOMMU hardware while\\nits contents in RAM is still some random old data, not zero-initialized.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/iommu/intel/pasid.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7e00b52c8cdd9d3a985d63d72ecae7bde6314883\",\"lessThan\":\"cd75e77125c8a51754ca4cd60b4ca083ed735d1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5c65f097124770c3e5b9b83ed1a8b68c119bc7b5\",\"lessThan\":\"0616137b70e6d9a547d4b60df8e1b64e36d83661\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2bed9455db7cc0ab7ece6b3d846472097b52855a\",\"lessThan\":\"36990407cdd257473607e33802d00e978af2759e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"194b3348bdbb7db65375c72f3f774aee4cc6614e\",\"lessThan\":\"c93f23375d8c410954b0df825e814b632fd62b9d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"194b3348bdbb7db65375c72f3f774aee4cc6614e\",\"lessThan\":\"5962c30a6f05ea1ab73f039e235bb30716243517\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"194b3348bdbb7db65375c72f3f774aee4cc6614e\",\"lessThan\":\"36244dfd3853f7bf89d03b8e90d56b23ce7fbc16\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"194b3348bdbb7db65375c72f3f774aee4cc6614e\",\"lessThan\":\"d15cda135148ea7ba929cfdbcf208182bc29a7aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"194b3348bdbb7db65375c72f3f774aee4cc6614e\",\"lessThan\":\"22d169bdd2849fe6bd18c2643742e1c02be6451c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1b48c70feefc499b62670521efa002ab01e05df5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.175\",\"lessThan\":\"5.10.252\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.103\",\"lessThan\":\"5.15.202\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.16\",\"lessThan\":\"6.1.165\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.237\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.2.3\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/iommu/intel/pasid.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"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:H/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.1,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.237\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"0C125C6E-3E7A-4A75-979B-04AAAD410EF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.175\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"08B1EE9B-280F-4E7A-941C-5D9AC948616D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.103\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"81778946-C4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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:51:25+00:00",
      "cve": "CVE-2026-45862",
      "id": "CVE-2026-45862",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/vt-d: Flush cache for PASID table before using it",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45862.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-28T17:15:30Z",
      "cve": "CVE-2026-45862",
      "id": "CVE-2026-45862",
      "initial_release_date": "2026-05-28T03:57:18Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "489",
      "product_status:known_not_affected": "133",
      "product_status:recommended": "294",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45862",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45862.json",
      "version": "16"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.