Vulnerability-Lookup

CVE-2026-64460 (GCVE-0-2026-64460)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

PCI/IOV: Skip VF Resizable BAR restore on read error

Summary

In the Linux kernel, the following vulnerability has been resolved: PCI/IOV: Skip VF Resizable BAR restore on read error sriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register to decide how many VF BARs to restore (nbars) and which VF BAR each iteration addresses (bar_idx). bar_idx indexes into dev->sriov->barsz[], which has only PCI_SRIOV_NUM_BARS (6) entries. When a device does not respond, config reads typically return PCI_ERROR_RESPONSE (~0). Both fields are 3 bits wide, so nbars and bar_idx both evaluate to 7. The barsz[] access then goes out of bounds. UBSAN reports this as: UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type 'resource_size_t [6]' Observed on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding during a failed GC6 power state exit. The subsequent pci_restore_state() invoked sriov_restore_vf_rebar_state() while config reads returned 0xffffffff, triggering the splat. Bail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE. No further VF BARs are touched, which is safe because a config read that returns PCI_ERROR_RESPONSE indicates the device is unreachable and restoration is pointless. This mirrors the guard in pci_restore_rebar_state().

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b7752462125040738…
https://git.kernel.org/stable/c/55fd485e66d0ad5c7…
https://git.kernel.org/stable/c/f34f1712229d71ce4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5a8f77e24a30bbce2fa57926f3dede84894fd10a , < b77524621250407386f44c6eea7e5e4619ada1ce (git) Affected: 5a8f77e24a30bbce2fa57926f3dede84894fd10a , < 55fd485e66d0ad5c762c23dba1461fe9c741cd96 (git) Affected: 5a8f77e24a30bbce2fa57926f3dede84894fd10a , < f34f1712229d71ce4286440fef12526fd4590b37 (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/iov.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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            {
              "lessThan": "55fd485e66d0ad5c762c23dba1461fe9c741cd96",
              "status": "affected",
              "version": "5a8f77e24a30bbce2fa57926f3dede84894fd10a",
              "versionType": "git"
            },
            {
              "lessThan": "f34f1712229d71ce4286440fef12526fd4590b37",
              "status": "affected",
              "version": "5a8f77e24a30bbce2fa57926f3dede84894fd10a",
              "versionType": "git"
            }
          ]
        },
        {
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.17",
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                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/IOV: Skip VF Resizable BAR restore on read error\n\nsriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register\nto decide how many VF BARs to restore (nbars) and which VF BAR each\niteration addresses (bar_idx). bar_idx indexes into dev-\u003esriov-\u003ebarsz[],\nwhich has only PCI_SRIOV_NUM_BARS (6) entries.\n\nWhen a device does not respond, config reads typically return\nPCI_ERROR_RESPONSE (~0).  Both fields are 3 bits wide, so nbars and bar_idx\nboth evaluate to 7. The barsz[] access then goes out of bounds.  UBSAN\nreports this as:\n\n  UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type \u0027resource_size_t [6]\u0027\n\nObserved on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding\nduring a failed GC6 power state exit. The subsequent pci_restore_state()\ninvoked sriov_restore_vf_rebar_state() while config reads returned\n0xffffffff, triggering the splat.\n\nBail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE.\nNo further VF BARs are touched, which is safe because a config read that\nreturns PCI_ERROR_RESPONSE indicates the device is unreachable and\nrestoration is pointless. This mirrors the guard in\npci_restore_rebar_state()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:27.568Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b77524621250407386f44c6eea7e5e4619ada1ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/55fd485e66d0ad5c762c23dba1461fe9c741cd96"
        },
        {
          "url": "https://git.kernel.org/stable/c/f34f1712229d71ce4286440fef12526fd4590b37"
        }
      ],
      "title": "PCI/IOV: Skip VF Resizable BAR restore on read error",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64460",
    "datePublished": "2026-07-25T08:51:27.568Z",
    "dateReserved": "2026-07-19T15:36:31.789Z",
    "dateUpdated": "2026-07-25T08:51:27.568Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64460",
      "date": "2026-07-25",
      "epss": "0.00206",
      "percentile": "0.10857"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64460\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:31.193\",\"lastModified\":\"2026-07-25T10:17:31.193\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nPCI/IOV: Skip VF Resizable BAR restore on read error\\n\\nsriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register\\nto decide how many VF BARs to restore (nbars) and which VF BAR each\\niteration addresses (bar_idx). bar_idx indexes into dev-\u003esriov-\u003ebarsz[],\\nwhich has only PCI_SRIOV_NUM_BARS (6) entries.\\n\\nWhen a device does not respond, config reads typically return\\nPCI_ERROR_RESPONSE (~0).  Both fields are 3 bits wide, so nbars and bar_idx\\nboth evaluate to 7. The barsz[] access then goes out of bounds.  UBSAN\\nreports this as:\\n\\n  UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type \u0027resource_size_t [6]\u0027\\n\\nObserved on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding\\nduring a failed GC6 power state exit. The subsequent pci_restore_state()\\ninvoked sriov_restore_vf_rebar_state() while config reads returned\\n0xffffffff, triggering the splat.\\n\\nBail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE.\\nNo further VF BARs are touched, which is safe because a config read that\\nreturns PCI_ERROR_RESPONSE indicates the device is unreachable and\\nrestoration is pointless. This mirrors the guard in\\npci_restore_rebar_state().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/pci/iov.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5a8f77e24a30bbce2fa57926f3dede84894fd10a\",\"lessThan\":\"b77524621250407386f44c6eea7e5e4619ada1ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a8f77e24a30bbce2fa57926f3dede84894fd10a\",\"lessThan\":\"55fd485e66d0ad5c762c23dba1461fe9c741cd96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5a8f77e24a30bbce2fa57926f3dede84894fd10a\",\"lessThan\":\"f34f1712229d71ce4286440fef12526fd4590b37\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/pci/iov.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/55fd485e66d0ad5c762c23dba1461fe9c741cd96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b77524621250407386f44c6eea7e5e4619ada1ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f34f1712229d71ce4286440fef12526fd4590b37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:54Z",
      "cve": "CVE-2026-64460",
      "id": "CVE-2026-64460",
      "initial_release_date": "2026-07-25T15:58:54Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64460",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64460.json",
      "version": "2"
    }
  }
}

GHSA-4G8V-7HMF-PF24

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

PCI/IOV: Skip VF Resizable BAR restore on read error

sriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register to decide how many VF BARs to restore (nbars) and which VF BAR each iteration addresses (bar_idx). bar_idx indexes into dev->sriov->barsz[], which has only PCI_SRIOV_NUM_BARS (6) entries.

When a device does not respond, config reads typically return PCI_ERROR_RESPONSE (~0). Both fields are 3 bits wide, so nbars and bar_idx both evaluate to 7. The barsz[] access then goes out of bounds. UBSAN reports this as:

UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type 'resource_size_t [6]'

Observed on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding during a failed GC6 power state exit. The subsequent pci_restore_state() invoked sriov_restore_vf_rebar_state() while config reads returned 0xffffffff, triggering the splat.

Bail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE. No further VF BARs are touched, which is safe because a config read that returns PCI_ERROR_RESPONSE indicates the device is unreachable and restoration is pointless. This mirrors the guard in pci_restore_rebar_state().

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64460"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:31Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/IOV: Skip VF Resizable BAR restore on read error\n\nsriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register\nto decide how many VF BARs to restore (nbars) and which VF BAR each\niteration addresses (bar_idx). bar_idx indexes into dev-\u003esriov-\u003ebarsz[],\nwhich has only PCI_SRIOV_NUM_BARS (6) entries.\n\nWhen a device does not respond, config reads typically return\nPCI_ERROR_RESPONSE (~0).  Both fields are 3 bits wide, so nbars and bar_idx\nboth evaluate to 7. The barsz[] access then goes out of bounds.  UBSAN\nreports this as:\n\n  UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type \u0027resource_size_t [6]\u0027\n\nObserved on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding\nduring a failed GC6 power state exit. The subsequent pci_restore_state()\ninvoked sriov_restore_vf_rebar_state() while config reads returned\n0xffffffff, triggering the splat.\n\nBail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE.\nNo further VF BARs are touched, which is safe because a config read that\nreturns PCI_ERROR_RESPONSE indicates the device is unreachable and\nrestoration is pointless. This mirrors the guard in\npci_restore_rebar_state().",
  "id": "GHSA-4g8v-7hmf-pf24",
  "modified": "2026-07-25T12:31:36Z",
  "published": "2026-07-25T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64460"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55fd485e66d0ad5c762c23dba1461fe9c741cd96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b77524621250407386f44c6eea7e5e4619ada1ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f34f1712229d71ce4286440fef12526fd4590b37"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64460 (GCVE-0-2026-64460)

GHSA-4G8V-7HMF-PF24

Tags

Sightings

Nomenclature