CVE-2025-21934 (GCVE-0-2025-21934)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:41 – Updated: 2026-08-05 11:55
VLAI
Title
rapidio: fix an API misues when rio_add_net() fails
Summary
In the Linux kernel, the following vulnerability has been resolved: rapidio: fix an API misues when rio_add_net() fails rio_add_net() calls device_register() and fails when device_register() fails. Thus, put_device() should be used rather than kfree(). Add "mport->net = NULL;" to avoid a use after free issue.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:22 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < d4ec862ce80f64db923a1d942b5d11cf6fc87d36 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < 88ddad53e4cfb6de861c6d4fb7b25427f46baed5 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < cdd9f58f7fe41a55fae4305ea51fc234769fd466 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < a5f5e520e8fbc6294020ff8afa36f684d92c6e6a (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < 2537f01d57f08c527e40bbb5862aa6ff43344898 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < 22e4977141dfc6d109bf29b495bf2187b4250990 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < f0aa4ee1cbbf7789907e5a3f6810de01c146c211 (git)
Affected: e8de370188d098bb49483c287b44925957c3c9b6 , < b2ef51c74b0171fde7eb69b6152d3d2f743ef269 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (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)
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Se agreg\u00f3 \\\"mport-\u0026gt;net = NULL;\\\" para evitar un problema de 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T07:36:30+00:00",
      "cve": "CVE-2025-21934",
      "id": "CVE-2025-21934",
      "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: rapidio: fix an API misues when rio_add_net() fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21934.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T01:26:21Z",
      "cve": "CVE-2025-21934",
      "id": "CVE-2025-21934",
      "initial_release_date": "2025-04-04T02:59:03Z",
      "product_status:known_affected": "688",
      "product_status:known_not_affected": "52",
      "product_status:recommended": "410",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21934",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21934.json",
      "version": "45"
    },
    "vulnrichment": {
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RapidIO is a board-level fabric interconnect, not an IP network path, so no remote or adjacent reachability exists.\\nAC:L - The attacker controls both sides of the unlocked mport-\u003enet race: two concurrent RIO_DEV_ADD ioctls both allocate a net and both register a device named \\\"rnet_\u003cid\u003e\\\" under the same parent, so the loser\u0027s device_register() fails deterministically with -EEXIST, and the sequence is freely retryable. Reclaiming the freed struct rio_net (which embeds a full struct device, landing in a common kmalloc cache) via standard heap spray is routine.\\nPR:L - The driver performs no capable() or permission check on any ioctl path \\u2014 access is gated purely by /dev/rio_mportN node permissions, and RapidIO deployments commonly delegate fabric enumeration to non-root userspace management daemons via group-accessible device nodes. An unprivileged user with access to the mport device node can fully drive the bug.\\nUI:N - Exploitation is entirely self-driven through ioctl calls by the attacker\u0027s own process; no victim action, mount, or file open by another user is needed.\\nS:U - The freed object, the corruption, and the resulting privilege gain all live within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\\nC:H - The dangling mport-\u003enet is used as a struct device parent and list head, so after slab reclamation the attacker can leak kernel pointers written back into the sprayed object and dereference attacker-influenced sysfs/kobject pointers, yielding arbitrary kernel memory disclosure.\\nI:H - list_add_tail(\u0026rdev-\u003enet_list, \u0026rdev-\u003enet-\u003edevices) inserts into a freed, attacker-reclaimed list head, giving a controllable write-what-where primitive, and device_add() increments a refcount inside the freed object \\u2014 both leverageable into arbitrary kernel memory write and control-flow hijack.\\nA:H - 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Thus, put_device() should be used rather than kfree().  Add\\n\\\"mport-\u003enet = NULL;\\\" to avoid a use after free issue.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.291\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.235\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.131\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.83\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.19\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.7\", \"versionStartIncluding\": \"4.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"4.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:55:27.199Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21934\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:55:27.199Z\", \"dateReserved\": \"2024-12-29T08:45:45.789Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-01T15:41:02.804Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.