CVE-2026-31781 (GCVE-0-2026-31781)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:15 – Updated: 2026-05-23 16:05
VLAI
Title
drm/ioc32: stop speculation on the drm_compat_ioctl path
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/ioc32: stop speculation on the drm_compat_ioctl path The drm compat ioctl path takes a user controlled pointer, and then dereferences it into a table of function pointers, the signature method of spectre problems. Fix this up by calling array_index_nospec() on the index to the function pointer list.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < 46a60ee8956ef1975f00455f614761c7ecedc09d (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < 5bb398991f378ef74d90b14a6ea8b61ff96cc03a (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < d59c5d8539662d95887b4564f3f72ad38076a2d5 (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < 489f2ef2b908898d01df697dc4fe1476674be640 (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < 4a41c2b18fc05d30b718d2602cac339eae710b34 (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < f0e441be08a2eab10b2d06fccfa267ee599dd6b3 (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < 27ef84bba9b9d7b03418c60fbc6069ea0e87b13c (git)
Affected: 505b5240329b922f21f91d5b5d1e535c805eca6d , < f8995c2df519f382525ca4bc90553ad2ec611067 (git)
Affected: abc60edcfc87771ff244763d4d19c67766f5dd0f (git)
Affected: a2a840d6dcae960c2dfdf3fcb1b759e1b7d90663 (git)
Affected: 00279b505289f7529d9be2e78915d0483ffbd314 (git)
Affected: d04e6ea0cec9e7d6cba806508f657d2d0dc6cacf (git)
Affected: 7f3ebea19795eb38438cd3709fabf2afd53cf447 (git)
Affected: 3.16.63 , < 3.17 (semver)
Affected: 4.4.170 , < 4.5 (semver)
Affected: 4.9.148 , < 4.10 (semver)
Affected: 4.14.91 , < 4.15 (semver)
Affected: 4.19.13 , < 4.20 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/ioc32: stop speculation on the drm_compat_ioctl path\n\nThe drm compat ioctl path takes a user controlled pointer, and then\ndereferences it into a table of function pointers, the signature method\nof spectre problems.  Fix this up by calling array_index_nospec() on the\nindex to the function pointer list."
          }
        ],
        "id": "CVE-2026-31781",
        "lastModified": "2026-06-17T10:34:27.110",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-05-01T15:16:41.577",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/27ef84bba9b9d7b03418c60fbc6069ea0e87b13c"
          },
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            "tags": [
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            "tags": [
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            "tags": [
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          },
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              "Patch"
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            "url": "https://git.kernel.org/stable/c/f8995c2df519f382525ca4bc90553ad2ec611067"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:51:10+00:00",
      "cve": "CVE-2026-31781",
      "id": "CVE-2026-31781",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/ioc32: stop speculation on the drm_compat_ioctl path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31781.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T13:42:21Z",
      "cve": "CVE-2026-31781",
      "id": "CVE-2026-31781",
      "initial_release_date": "2026-05-06T01:42:38Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "639",
      "product_status:known_not_affected": "19",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31781",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31781.json",
      "version": "9"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.