Vulnerability-Lookup

GHSA-4C27-P37X-4J2H

Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31

Details

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

crypto: virtio - bound the akcipher result length

virtio_crypto_dataq_akcipher_callback() sets the result length from the device-reported response length without bounding it to the destination buffer, which was allocated for the original request length. sg_copy_from_buffer() then reads that many bytes from the destination buffer; a backend reporting a larger length over-reads adjacent kernel heap into the caller's scatterlist (an out-of-bounds read).

Clamp the reported length to the originally requested destination length. A conforming device reports no more than that, so valid results are unaffected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80836"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-04T16:18:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: virtio - bound the akcipher result length\n\nvirtio_crypto_dataq_akcipher_callback() sets the result length from the\ndevice-reported response length without bounding it to the destination\nbuffer, which was allocated for the original request length.\nsg_copy_from_buffer() then reads that many bytes from the destination\nbuffer; a backend reporting a larger length over-reads adjacent kernel\nheap into the caller\u0027s scatterlist (an out-of-bounds read).\n\nClamp the reported length to the originally requested destination length.\nA conforming device reports no more than that, so valid results are\nunaffected.",
  "id": "GHSA-4c27-p37x-4j2h",
  "modified": "2026-09-04T18:31:28Z",
  "published": "2026-09-04T18:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80836"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f9f877b1ef1fbd4ee95571cddf39c8002cee252"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fda114a42f1510a4ec8a0b17a0cfc997952ccc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5545de5050cbc3594506d74f2c392b0716cf8bca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f77a956f6a19f9463ef1527c9d0cda50dded6b92"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80836 (GCVE-0-2026-80836)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54

Title

crypto: virtio - bound the akcipher result length

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: virtio - bound the akcipher result length virtio_crypto_dataq_akcipher_callback() sets the result length from the device-reported response length without bounding it to the destination buffer, which was allocated for the original request length. sg_copy_from_buffer() then reads that many bytes from the destination buffer; a backend reporting a larger length over-reads adjacent kernel heap into the caller's scatterlist (an out-of-bounds read). Clamp the reported length to the originally requested destination length. A conforming device reports no more than that, so valid results are unaffected.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/5545de5050cbc3594…
https://git.kernel.org/stable/c/3fda114a42f1510a4…
https://git.kernel.org/stable/c/1f9f877b1ef1fbd4e…
https://git.kernel.org/stable/c/f77a956f6a19f9463…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a , < 5545de5050cbc3594506d74f2c392b0716cf8bca (git) Affected: a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a , < 3fda114a42f1510a4ec8a0b17a0cfc997952ccc2 (git) Affected: a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a , < 1f9f877b1ef1fbd4ee95571cddf39c8002cee252 (git) Affected: a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a , < f77a956f6a19f9463ef1527c9d0cda50dded6b92 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.18.49 , ≤ 6.18.* (semver) Unaffected: 7.1.13 , ≤ 7.1.* (semver) Unaffected: 7.2.3 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/crypto/virtio/virtio_crypto_akcipher_algs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5545de5050cbc3594506d74f2c392b0716cf8bca",
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              "version": "a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a",
              "versionType": "git"
            },
            {
              "lessThan": "3fda114a42f1510a4ec8a0b17a0cfc997952ccc2",
              "status": "affected",
              "version": "a36bd0ad9fbf69d0d711b1c105954ce8d6cc144a",
              "versionType": "git"
            },
            {
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          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.19"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
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              "version": "7.1.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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        }
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: virtio - bound the akcipher result length\n\nvirtio_crypto_dataq_akcipher_callback() sets the result length from the\ndevice-reported response length without bounding it to the destination\nbuffer, which was allocated for the original request length.\nsg_copy_from_buffer() then reads that many bytes from the destination\nbuffer; a backend reporting a larger length over-reads adjacent kernel\nheap into the caller\u0027s scatterlist (an out-of-bounds read).\n\nClamp the reported length to the originally requested destination length.\nA conforming device reports no more than that, so valid results are\nunaffected."
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      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:54:44.981Z",
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    "cveId": "CVE-2026-80836",
    "datePublished": "2026-09-04T15:54:44.981Z",
    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-04T15:54:44.981Z",
    "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.

Action not permitted

GHSA-4C27-P37X-4J2H

CVE-2026-80836 (GCVE-0-2026-80836)

Tags

Sightings

Nomenclature