Vulnerability-Lookup

GHSA-26M7-CQMR-VWVJ

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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

accel/qaic: Add overflow check to remap_pfn_range during mmap

The call to remap_pfn_range in qaic_gem_object_mmap is susceptible to (re)mapping beyond the VMA if the BO is too large. This can cause use after free issues when munmap() unmaps only the VMA region and not the additional mappings. To prevent this, check the remaining size of the VMA before remapping and truncate the remapped length if sg->length is too large.

[jhugo: fix braces from checkpatch --strict]

Severity

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64051"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:45Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/qaic: Add overflow check to remap_pfn_range during mmap\n\nThe call to remap_pfn_range in qaic_gem_object_mmap is susceptible to\n(re)mapping beyond the VMA if the BO is too large. This can cause use\nafter free issues when munmap() unmaps only the VMA region and not the\nadditional mappings. To prevent this, check the remaining size of the\nVMA before remapping and truncate the remapped length if sg-\u003elength is\ntoo large.\n\n[jhugo: fix braces from checkpatch --strict]",
  "id": "GHSA-26m7-cqmr-vwvj",
  "modified": "2026-07-20T15:31:57Z",
  "published": "2026-07-19T18:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64051"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c795012d0e06b7740e40319b86ff8d2a435098d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8dd6edbe26770df147136c3f2ac976c873b82650"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97a8e89cdef36207a8776edc03d6931763a06ad0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9baafc2fea096279e75480f93fd5942e8336b510"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa16b2bc0f02709919e2435f531406531e5bcc69"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64051 (GCVE-0-2026-64051)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38

Title

accel/qaic: Add overflow check to remap_pfn_range during mmap

Summary

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: Add overflow check to remap_pfn_range during mmap The call to remap_pfn_range in qaic_gem_object_mmap is susceptible to (re)mapping beyond the VMA if the BO is too large. This can cause use after free issues when munmap() unmaps only the VMA region and not the additional mappings. To prevent this, check the remaining size of the VMA before remapping and truncate the remapped length if sg->length is too large. [jhugo: fix braces from checkpatch --strict]

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

5 references

URL	Tags
https://git.kernel.org/stable/c/9baafc2fea096279e…
https://git.kernel.org/stable/c/8dd6edbe26770df14…
https://git.kernel.org/stable/c/97a8e89cdef36207a…
https://git.kernel.org/stable/c/8c795012d0e06b774…
https://git.kernel.org/stable/c/aa16b2bc0f0270991…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ff13be8303336ead5621712f2c55012d738878b5 , < 9baafc2fea096279e75480f93fd5942e8336b510 (git) Affected: ff13be8303336ead5621712f2c55012d738878b5 , < 8dd6edbe26770df147136c3f2ac976c873b82650 (git) Affected: ff13be8303336ead5621712f2c55012d738878b5 , < 97a8e89cdef36207a8776edc03d6931763a06ad0 (git) Affected: ff13be8303336ead5621712f2c55012d738878b5 , < 8c795012d0e06b7740e40319b86ff8d2a435098d (git) Affected: ff13be8303336ead5621712f2c55012d738878b5 , < aa16b2bc0f02709919e2435f531406531e5bcc69 (git)
Linux	Linux	Affected: 6.4 Unaffected: 0 , < 6.4 (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/qaic/qaic_data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9baafc2fea096279e75480f93fd5942e8336b510",
              "status": "affected",
              "version": "ff13be8303336ead5621712f2c55012d738878b5",
              "versionType": "git"
            },
            {
              "lessThan": "8dd6edbe26770df147136c3f2ac976c873b82650",
              "status": "affected",
              "version": "ff13be8303336ead5621712f2c55012d738878b5",
              "versionType": "git"
            },
            {
              "lessThan": "97a8e89cdef36207a8776edc03d6931763a06ad0",
              "status": "affected",
              "version": "ff13be8303336ead5621712f2c55012d738878b5",
              "versionType": "git"
            },
            {
              "lessThan": "8c795012d0e06b7740e40319b86ff8d2a435098d",
              "status": "affected",
              "version": "ff13be8303336ead5621712f2c55012d738878b5",
              "versionType": "git"
            },
            {
              "lessThan": "aa16b2bc0f02709919e2435f531406531e5bcc69",
              "status": "affected",
              "version": "ff13be8303336ead5621712f2c55012d738878b5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/accel/qaic/qaic_data.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.142",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.92",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/qaic: Add overflow check to remap_pfn_range during mmap\n\nThe call to remap_pfn_range in qaic_gem_object_mmap is susceptible to\n(re)mapping beyond the VMA if the BO is too large. This can cause use\nafter free issues when munmap() unmaps only the VMA region and not the\nadditional mappings. To prevent this, check the remaining size of the\nVMA before remapping and truncate the remapped length if sg-\u003elength is\ntoo large.\n\n[jhugo: fix braces from checkpatch --strict]"
        }
      ],
      "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 - Exploitation requires local access via the QAIC accel device node (/dev/accel/accel*) through DRM ioctls and mmap syscalls; there is no network-facing attack surface.\nAC:L - An attacker fully controls BO allocation size, partial mmap length, and munmap timing, deterministically mapping PFNs beyond the VMA without races or external conditions.\nPR:L - No DRM master or root is required; any unprivileged local user with access to the accel device node (common on shared cloud AI inference hosts) can create a BO, partial-mmap it, and trigger the bug.\nUI:N - Exploitation requires only attacker-initiated ioctl and mmap operations on an open accel file descriptor, with no victim interaction.\nS:U - The UAF corrupts kernel page-table mappings within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries.\nC:H - The commit explicitly identifies a use-after-free of page structures left mapped past the VMA; UAF of kernel mappings enables arbitrary kernel memory read primitives.\nI:H - UAF on kernel page structures can be leveraged for arbitrary kernel memory writes and local privilege escalation through heap grooming and control of freed pages.\nA:H - Accessing stale PFN mappings after BO teardown causes kernel oops/panic; UAF reliably threatens system availability even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:42.519Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9baafc2fea096279e75480f93fd5942e8336b510"
        },
        {
          "url": "https://git.kernel.org/stable/c/8dd6edbe26770df147136c3f2ac976c873b82650"
        },
        {
          "url": "https://git.kernel.org/stable/c/97a8e89cdef36207a8776edc03d6931763a06ad0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c795012d0e06b7740e40319b86ff8d2a435098d"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa16b2bc0f02709919e2435f531406531e5bcc69"
        }
      ],
      "title": "accel/qaic: Add overflow check to remap_pfn_range during mmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64051",
    "datePublished": "2026-07-19T15:39:34.608Z",
    "dateReserved": "2026-07-19T07:54:57.029Z",
    "dateUpdated": "2026-08-05T12:38:42.519Z",
    "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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

GHSA-26M7-CQMR-VWVJ

CVE-2026-64051 (GCVE-0-2026-64051)

Tags

Sightings

Nomenclature

Related by attack behaviour