Vulnerability-Lookup

GHSA-742C-798H-FPJ3

Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-04-23 21:31

Details

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

iommu/sva: Fix crash in iommu_sva_unbind_device()

domain->mm->iommu_mm can be freed by iommu_domain_free(): iommu_domain_free() mmdrop() __mmdrop() mm_pasid_drop() After iommu_domain_free() returns, accessing domain->mm->iommu_mm may dereference a freed mm structure, leading to a crash.

Fix this by moving the code that accesses domain->mm->iommu_mm to before the call to iommu_domain_free().

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-23429"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:24Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Fix crash in iommu_sva_unbind_device()\n\ndomain-\u003emm-\u003eiommu_mm can be freed by iommu_domain_free():\n  iommu_domain_free()\n    mmdrop()\n      __mmdrop()\n        mm_pasid_drop()\nAfter iommu_domain_free() returns, accessing domain-\u003emm-\u003eiommu_mm may\ndereference a freed mm structure, leading to a crash.\n\nFix this by moving the code that accesses domain-\u003emm-\u003eiommu_mm to before\nthe call to iommu_domain_free().",
  "id": "GHSA-742c-798h-fpj3",
  "modified": "2026-04-23T21:31:18Z",
  "published": "2026-04-03T18:31:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23429"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06e14c36e20b48171df13d51b89fe67c594ed07a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58abeb7b9562f25bdfa2f5ae5ce803eb02e74433"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f5daaa2c959d9f894fb5b1ab76da8612dd220a0d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-23429 (GCVE-0-2026-23429)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-08-05 12:21

Title

iommu/sva: Fix crash in iommu_sva_unbind_device()

Summary

In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Fix crash in iommu_sva_unbind_device() domain->mm->iommu_mm can be freed by iommu_domain_free(): iommu_domain_free() mmdrop() __mmdrop() mm_pasid_drop() After iommu_domain_free() returns, accessing domain->mm->iommu_mm may dereference a freed mm structure, leading to a crash. Fix this by moving the code that accesses domain->mm->iommu_mm to before the call to iommu_domain_free().

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/58abeb7b9562f25bd…
https://git.kernel.org/stable/c/f5daaa2c959d9f894…
https://git.kernel.org/stable/c/06e14c36e20b48171…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 9f0a7ab700f8620e433b05c57fbd26c92ea186d9 , < 58abeb7b9562f25bdfa2f5ae5ce803eb02e74433 (git) Affected: e37d5a2d60a338c5917c45296bac65da1382eda5 , < f5daaa2c959d9f894fb5b1ab76da8612dd220a0d (git) Affected: e37d5a2d60a338c5917c45296bac65da1382eda5 , < 06e14c36e20b48171df13d51b89fe67c594ed07a (git) Affected: 6.18.7 , < 6.18.20 (semver)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 6.18.20 , ≤ 6.18.* (semver) Unaffected: 6.19.10 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommu-sva.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "58abeb7b9562f25bdfa2f5ae5ce803eb02e74433",
              "status": "affected",
              "version": "9f0a7ab700f8620e433b05c57fbd26c92ea186d9",
              "versionType": "git"
            },
            {
              "lessThan": "f5daaa2c959d9f894fb5b1ab76da8612dd220a0d",
              "status": "affected",
              "version": "e37d5a2d60a338c5917c45296bac65da1382eda5",
              "versionType": "git"
            },
            {
              "lessThan": "06e14c36e20b48171df13d51b89fe67c594ed07a",
              "status": "affected",
              "version": "e37d5a2d60a338c5917c45296bac65da1382eda5",
              "versionType": "git"
            },
            {
              "lessThan": "6.18.20",
              "status": "affected",
              "version": "6.18.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommu-sva.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "6.18.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/sva: Fix crash in iommu_sva_unbind_device()\n\ndomain-\u003emm-\u003eiommu_mm can be freed by iommu_domain_free():\n  iommu_domain_free()\n    mmdrop()\n      __mmdrop()\n        mm_pasid_drop()\nAfter iommu_domain_free() returns, accessing domain-\u003emm-\u003eiommu_mm may\ndereference a freed mm structure, leading to a crash.\n\nFix this by moving the code that accesses domain-\u003emm-\u003eiommu_mm to before\nthe call to iommu_domain_free()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable `iommu_sva_unbind_device()` path is reached through local character/DRM/UIO accelerator device open and release paths, not by remote packets or adjacent-link traffic.\nAC:L - The attacker can deterministically create the lifetime pattern with normal open/fork/exit/close or file-descriptor transfer so the bound `mm` is finally dropped during unbind; no uncontrollable race is required.\nPR:L - The attacker needs local access to an SVA-capable user-exposed accelerator/UIO/idxd device node. The IOMMU SVA bind/unbind path itself has no CAP_* gate, and these devices are intended to be usable by local user processes.\nUI:N - Exploitation can be driven entirely by the attacker\u0027s own process and file descriptors. No separate victim action is required.\nS:U - The bug corrupts kernel memory from within a kernel subsystem and does not directly cross a VM, container, or IOMMU/DMA protection boundary. This is standard local kernel compromise scope.\nC:H - The stale `iommu_mm` object is used after it may be freed, and freed-object reuse can provide attacker-influenced data exposure primitives. Per the required guidance, use-after-free is scored as high confidentiality impact.\nI:H - The old code can perform list operations on freed memory after `iommu_domain_free()`, creating a plausible kernel heap/list corruption and arbitrary-write primitive. Per the required guidance, use-after-free is scored as high integrity impact.\nA:H - The documented failure mode is a kernel crash from dereferencing or manipulating freed `mm`/IOMMU SVA state. A kernel oops or panic is high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:21:42.311Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/58abeb7b9562f25bdfa2f5ae5ce803eb02e74433"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5daaa2c959d9f894fb5b1ab76da8612dd220a0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/06e14c36e20b48171df13d51b89fe67c594ed07a"
        }
      ],
      "title": "iommu/sva: Fix crash in iommu_sva_unbind_device()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23429",
    "datePublished": "2026-04-03T15:15:15.856Z",
    "dateReserved": "2026-01-13T15:37:46.016Z",
    "dateUpdated": "2026-08-05T12:21:42.311Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
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GHSA-742C-798H-FPJ3

CVE-2026-23429 (GCVE-0-2026-23429)

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