Vulnerability-Lookup

GHSA-M48C-Q8RX-QXXM

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

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

crypto: ccp/sev-dev-tsm - bail out early when pdev->bus is NULL

dsm_create() initially checks pdev->bus when computing segment_id:

u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0;

But the next two lines unconditionally dereference pdev->bus via pcie_find_root_port() and especially pci_dev_id(pdev), which expands to PCI_DEVID(dev->bus->number, dev->devfn). If pdev->bus is in fact NULL, segment_id is initialised to 0 but the very next statement crashes the kernel.

smatch flags this:

drivers/crypto/ccp/sev-dev-tsm.c:253 dsm_create() error: we previously assumed 'pdev->bus' could be null (see line 251)

Make the NULL handling consistent: if pdev->bus is NULL the device has no PCI context to work with and SEV TIO setup cannot proceed, so return -ENODEV before any of the bus-dependent lookups. The remaining initialisation now runs only on the path where pdev->bus is known to be valid.

No change for callers where pdev->bus is non-NULL, which is the only case where dsm_create() did meaningful work before this change.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80651"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:50Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp/sev-dev-tsm - bail out early when pdev-\u003ebus is NULL\n\ndsm_create() initially checks pdev-\u003ebus when computing segment_id:\n\n\tu8 segment_id = pdev-\u003ebus ? pci_domain_nr(pdev-\u003ebus) : 0;\n\nBut the next two lines unconditionally dereference pdev-\u003ebus via\npcie_find_root_port() and especially pci_dev_id(pdev), which expands\nto PCI_DEVID(dev-\u003ebus-\u003enumber, dev-\u003edevfn). If pdev-\u003ebus is in fact\nNULL, segment_id is initialised to 0 but the very next statement\ncrashes the kernel.\n\nsmatch flags this:\n\n  drivers/crypto/ccp/sev-dev-tsm.c:253 dsm_create() error: we\n    previously assumed \u0027pdev-\u003ebus\u0027 could be null (see line 251)\n\nMake the NULL handling consistent: if pdev-\u003ebus is NULL the device\nhas no PCI context to work with and SEV TIO setup cannot proceed,\nso return -ENODEV before any of the bus-dependent lookups. The\nremaining initialisation now runs only on the path where pdev-\u003ebus\nis known to be valid.\n\nNo change for callers where pdev-\u003ebus is non-NULL, which is the\nonly case where dsm_create() did meaningful work before this change.",
  "id": "GHSA-m48c-q8rx-qxxm",
  "modified": "2026-08-28T09:31:48Z",
  "published": "2026-08-28T09:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80651"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bafd740095fb3d0e9a00540bc8f3484c38e6f85"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/930d9d36ea618a775985446a125aedeb401db522"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80651 (GCVE-0-2026-80651)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48

Title

crypto: ccp/sev-dev-tsm - bail out early when pdev->bus is NULL

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp/sev-dev-tsm - bail out early when pdev->bus is NULL dsm_create() initially checks pdev->bus when computing segment_id: u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0; But the next two lines unconditionally dereference pdev->bus via pcie_find_root_port() and especially pci_dev_id(pdev), which expands to PCI_DEVID(dev->bus->number, dev->devfn). If pdev->bus is in fact NULL, segment_id is initialised to 0 but the very next statement crashes the kernel. smatch flags this: drivers/crypto/ccp/sev-dev-tsm.c:253 dsm_create() error: we previously assumed 'pdev->bus' could be null (see line 251) Make the NULL handling consistent: if pdev->bus is NULL the device has no PCI context to work with and SEV TIO setup cannot proceed, so return -ENODEV before any of the bus-dependent lookups. The remaining initialisation now runs only on the path where pdev->bus is known to be valid. No change for callers where pdev->bus is non-NULL, which is the only case where dsm_create() did meaningful work before this change.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/6bafd740095fb3d0e…
https://git.kernel.org/stable/c/930d9d36ea618a775…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4be423572da1f4c11f45168e3fafda870ddac9f8 , < 6bafd740095fb3d0e9a00540bc8f3484c38e6f85 (git) Affected: 4be423572da1f4c11f45168e3fafda870ddac9f8 , < 930d9d36ea618a775985446a125aedeb401db522 (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev-tsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6bafd740095fb3d0e9a00540bc8f3484c38e6f85",
              "status": "affected",
              "version": "4be423572da1f4c11f45168e3fafda870ddac9f8",
              "versionType": "git"
            },
            {
              "lessThan": "930d9d36ea618a775985446a125aedeb401db522",
              "status": "affected",
              "version": "4be423572da1f4c11f45168e3fafda870ddac9f8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/ccp/sev-dev-tsm.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": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp/sev-dev-tsm - bail out early when pdev-\u003ebus is NULL\n\ndsm_create() initially checks pdev-\u003ebus when computing segment_id:\n\n\tu8 segment_id = pdev-\u003ebus ? pci_domain_nr(pdev-\u003ebus) : 0;\n\nBut the next two lines unconditionally dereference pdev-\u003ebus via\npcie_find_root_port() and especially pci_dev_id(pdev), which expands\nto PCI_DEVID(dev-\u003ebus-\u003enumber, dev-\u003edevfn). If pdev-\u003ebus is in fact\nNULL, segment_id is initialised to 0 but the very next statement\ncrashes the kernel.\n\nsmatch flags this:\n\n  drivers/crypto/ccp/sev-dev-tsm.c:253 dsm_create() error: we\n    previously assumed \u0027pdev-\u003ebus\u0027 could be null (see line 251)\n\nMake the NULL handling consistent: if pdev-\u003ebus is NULL the device\nhas no PCI context to work with and SEV TIO setup cannot proceed,\nso return -ENODEV before any of the bus-dependent lookups. The\nremaining initialisation now runs only on the path where pdev-\u003ebus\nis known to be valid.\n\nNo change for callers where pdev-\u003ebus is non-NULL, which is the\nonly case where dsm_create() did meaningful work before this change."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:59.460Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/6bafd740095fb3d0e9a00540bc8f3484c38e6f85"
        },
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          "url": "https://git.kernel.org/stable/c/930d9d36ea618a775985446a125aedeb401db522"
        }
      ],
      "title": "crypto: ccp/sev-dev-tsm - bail out early when pdev-\u003ebus is NULL",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80651",
    "datePublished": "2026-08-28T06:48:59.460Z",
    "dateReserved": "2026-08-26T14:34:25.779Z",
    "dateUpdated": "2026-08-28T06:48:59.460Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

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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