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CVE-2025-21669 (GCVE-0-2025-21669)

Vulnerability from cvelistv5 – Published: 2025-01-31 11:25 – Updated: 2026-08-05 11:53
VLAI
Title
vsock/virtio: discard packets if the transport changes
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 19:52 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < 18a7fc371d1dbf8deff16c2dd9292bcc73f43040 (git)
Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < 6486915fa661584d70e8e7e4068c6c075c67dd6d (git)
Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < 88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee (git)
Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < d88b249e14bd0ee1e46bbe4f456e22e01b8c68de (git)
Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < 677579b641af109613564460a4e3bdcb16850b61 (git)
Affected: c0cfa2d8a788fcf45df5bf4070ab2474c88d543a , < 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.234 , ≤ 5.10.* (semver)
Unaffected: 5.15.177 , ≤ 5.15.* (semver)
Unaffected: 6.1.127 , ≤ 6.1.* (semver)
Unaffected: 6.6.74 , ≤ 6.6.* (semver)
Unaffected: 6.12.11 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:39:12+00:00",
      "cve": "CVE-2025-21669",
      "id": "CVE-2025-21669",
      "initial_release_date": "2025-01-31T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vsock/virtio: discard packets if the transport changes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21669.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T02:06:23Z",
      "cve": "CVE-2025-21669",
      "id": "CVE-2025-21669",
      "initial_release_date": "2025-02-01T03:47:38Z",
      "product_status:known_affected": "540",
      "product_status:known_not_affected": "298",
      "product_status:recommended": "401",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21669",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21669.json",
      "version": "55"
    },
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Per kernel scoring guidance vsock is Local.\\nAC:L - The attacker controls every element: both `connect()` calls, the interrupting signal (self-delivered via `alarm()`/`pthread_kill()`), the peer socket that times the RESPONSE, and the RST/SHUTDOWN packet, and the sequence can be retried indefinitely.\\nPR:L - `vsock_create()` performs no capability check and `CONFIG_VSOCKETS_LOOPBACK` is `default y`, so any unprivileged local user can create AF_VSOCK sockets, auto-bind an ephemeral port, and inject loopback packets.\\nUI:N - The entire sequence \\u2014 double connect, signal, packet injection \\u2014 is performed by the attacker\u0027s own process with no victim action required.\\nS:U - The corruption and crash are confined to the kernel of the machine running the attacker\u0027s process; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - When the socket has been reassigned to a non-virtio transport, `vsk-\u003etrans` is type-confused as `struct virtio_vsock_sock`, letting the receive path read and act on mistyped heap state (mistyped `sk_buff_head` in `virtio_transport_recv_enqueue()`, `container_of` on a non-`virtio_transport` ops struct), which is leverageable for arbitrary kernel memory disclosure.\\nI:H - The same type confusion writes two fully attacker-controlled 32-bit header values (`buf_alloc`/`fwd_cnt`) into the middle of a differently-typed heap object (over `qpair`/`produce_size` in `struct vmci_transport`) and performs an indirect call through `t_ops-\u003esend_pkt` derived from a bogus `container_of`, giving a controlled-write and control-flow hijack primitive.\\nA:H - The confirmed and reported impact is a NULL pointer dereference at `vsk-\u003etransport-\u003estream_has_data()` while the socket lock is held, producing a kernel oops/panic that an unprivileged user can trigger on demand.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", 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\"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/vmw_vsock/virtio_transport_common.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040\"}, {\"url\": \"https://git.kernel.org/stable/c/6486915fa661584d70e8e7e4068c6c075c67dd6d\"}, {\"url\": \"https://git.kernel.org/stable/c/88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee\"}, {\"url\": \"https://git.kernel.org/stable/c/d88b249e14bd0ee1e46bbe4f456e22e01b8c68de\"}, {\"url\": \"https://git.kernel.org/stable/c/677579b641af109613564460a4e3bdcb16850b61\"}, {\"url\": \"https://git.kernel.org/stable/c/2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvsock/virtio: discard packets if the transport changes\\n\\nIf the socket has been de-assigned or assigned to another transport,\\nwe must discard any packets received because they are not expected\\nand would cause issues when we access vsk-\u003etransport.\\n\\nA possible scenario is described by Hyunwoo Kim in the attached link,\\nwhere after a first connect() interrupted by a signal, and a second\\nconnect() failed, we can find `vsk-\u003etransport` at NULL, leading to a\\nNULL pointer dereference.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.234\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.177\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.127\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.74\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.11\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:53:30.113Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21669\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:53:30.113Z\", \"dateReserved\": \"2024-12-29T08:45:45.735Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-01-31T11:25:33.185Z\", \"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.