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CVE-2025-21904 (GCVE-0-2025-21904)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-05-11 21:08
VLAI
Title
caif_virtio: fix wrong pointer check in cfv_probe()
Summary
In the Linux kernel, the following vulnerability has been resolved: caif_virtio: fix wrong pointer check in cfv_probe() del_vqs() frees virtqueues, therefore cfv->vq_tx pointer should be checked for NULL before calling it, not cfv->vdev. Also the current implementation is redundant because the pointer cfv->vdev is dereferenced before it is checked for NULL. Fix this by checking cfv->vq_tx for NULL instead of cfv->vdev before calling del_vqs().
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:24 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 990fff6980d0c1693d60a812f58dbf93eab0473f (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 7b5fe58959822e6cfa884327cabba6be3b01883d (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 8e4e08ca4cc634b337bb74bc9a70758fdeda0bcb (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 29e0cd296c87240278e2f7ea4cf3f496b60c03af (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 90d302619ee7ce5ed0c69c29c290bdccfde66418 (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 56cddf71cce3b15b078e937fadab29962b6f6643 (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < 597c27e5f04cb50e56cc9aeda75d3e42b6b89c3e (git)
Affected: 0d2e1a2926b1839a4b74519e660739b2566c9386 , < a466fd7e9fafd975949e5945e2f70c33a94b1a70 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif_virtio: fix wrong pointer check in cfv_probe()\n\ndel_vqs() frees virtqueues, therefore cfv-\u003evq_tx pointer should be checked\nfor NULL before calling it, not cfv-\u003evdev. Also the current implementation\nis redundant because the pointer cfv-\u003evdev is dereferenced before it is\nchecked for NULL.\n\nFix this by checking cfv-\u003evq_tx for NULL instead of cfv-\u003evdev before\ncalling del_vqs()."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: caif_virtio: se corrige una comprobaci\u00f3n incorrecta del puntero en cfv_probe() del_vqs() libera colas virtuales. Por lo tanto, se debe comprobar si el puntero cfv-\u0026gt;vq_tx es nulo antes de llamarlo, no cfv-\u0026gt;vdev. Adem\u00e1s, la implementaci\u00f3n actual es redundante porque se desreferencia el puntero cfv-\u0026gt;vdev antes de comprobar si es nulo. Para solucionar esto, compruebe si el puntero cfv-\u0026gt;vq_tx es nulo en lugar de cfv-\u0026gt;vdev antes de llamar a del_vqs()."
          }
        ],
        "id": "CVE-2025-21904",
        "lastModified": "2026-06-17T08:44:34.383",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
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                "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",
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              "impactScore": 3.6,
              "source": "nvd@nist.gov",
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              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                  {
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                "role": "CISA Coordinator",
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                "version": "2.0.3"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/29e0cd296c87240278e2f7ea4cf3f496b60c03af"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          {
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            "tags": [
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          {
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            "tags": [
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            "url": "https://git.kernel.org/stable/c/990fff6980d0c1693d60a812f58dbf93eab0473f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a466fd7e9fafd975949e5945e2f70c33a94b1a70"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:04:59+00:00",
      "cve": "CVE-2025-21904",
      "id": "CVE-2025-21904",
      "initial_release_date": "2025-04-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: caif_virtio: fix wrong pointer check in cfv_probe()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21904.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:22:57Z",
      "cve": "CVE-2025-21904",
      "id": "CVE-2025-21904",
      "initial_release_date": "2025-04-02T13:29:25Z",
      "product_status:known_affected": "755",
      "product_status:known_not_affected": "66",
      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21904",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21904.json",
      "version": "45"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T19:38:48.685Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
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                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
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                  "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"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-21904",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
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                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:24:28.456354Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
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                    "cweId": "CWE-476",
                    "description": "CWE-476 NULL Pointer Dereference",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T14:37:27.005Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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                  "versionType": "git"
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                {
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                  "status": "affected",
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                },
                {
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              ],
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              "vendor": "Linux",
              "versions": [
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                  "version": "3.10"
                },
                {
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                  "status": "unaffected",
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                  "versionType": "semver"
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                  "versionType": "semver"
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                  "lessThanOrEqual": "5.15.*",
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                  "version": "5.15.179",
                  "versionType": "semver"
                },
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                  "version": "6.1.131",
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                  "version": "6.12.19",
                  "versionType": "semver"
                },
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                  "version": "6.13.7",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.14",
                  "versionType": "original_commit_for_fix"
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          ],
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              "nodes": [
                {
                  "cpeMatch": [
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                    {
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif_virtio: fix wrong pointer check in cfv_probe()\n\ndel_vqs() frees virtqueues, therefore cfv-\u003evq_tx pointer should be checked\nfor NULL before calling it, not cfv-\u003evdev. Also the current implementation\nis redundant because the pointer cfv-\u003evdev is dereferenced before it is\nchecked for NULL.\n\nFix this by checking cfv-\u003evq_tx for NULL instead of cfv-\u003evdev before\ncalling del_vqs()."
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              "url": "https://git.kernel.org/stable/c/a466fd7e9fafd975949e5945e2f70c33a94b1a70"
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        "dateReserved": "2024-12-29T08:45:45.785Z",
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}



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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.