CVE-2026-53132 (GCVE-0-2026-53132)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-08-05 12:33
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential unbounded skb queue virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc. virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM. If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0. Fix this by estimating the skb metadata size: (Number of skbs in the queue) * SKB_TRUESIZE(0)
References
Impacted products
Vendor Product Version
Linux Linux Version: 077706165717686a2a6a71405fef036cd5b37ae0
Version: 077706165717686a2a6a71405fef036cd5b37ae0
Version: 077706165717686a2a6a71405fef036cd5b37ae0
Version: 077706165717686a2a6a71405fef036cd5b37ae0
Version: 5852a2b573f7a3a29df46296e56aa3491e589cdf
Version: 6.1.63   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1eca304f97a34ed5e921e1f0e06c8b241f25bf12",
              "status": "affected",
              "version": "077706165717686a2a6a71405fef036cd5b37ae0",
              "versionType": "git"
            },
            {
              "lessThan": "9bdc637fde66b63d6cad0caacd034888bb7bf5f5",
              "status": "affected",
              "version": "077706165717686a2a6a71405fef036cd5b37ae0",
              "versionType": "git"
            },
            {
              "lessThan": "100d5b2ffdc6468b9e48532641f29e83efdcb63c",
              "status": "affected",
              "version": "077706165717686a2a6a71405fef036cd5b37ae0",
              "versionType": "git"
            },
            {
              "lessThan": "059b7dbd20a6f0c539a45ddff1573cb8946685b5",
              "status": "affected",
              "version": "077706165717686a2a6a71405fef036cd5b37ae0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5852a2b573f7a3a29df46296e56aa3491e589cdf",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.63",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.94",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.63",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix potential unbounded skb queue\n\nvirtio_transport_inc_rx_pkt() checks vvs-\u003erx_bytes + len \u003e vvs-\u003ebuf_alloc.\n\nvirtio_transport_recv_enqueue() skips coalescing for packets\nwith VIRTIO_VSOCK_SEQ_EOM.\n\nIf fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM,\na very large number of packets can be queued\nbecause vvs-\u003erx_bytes stays at 0.\n\nFix this by estimating the skb metadata size:\n\n\t(Number of skbs in the queue) * SKB_TRUESIZE(0)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is in virtio/vhost-vsock receive handling, reached through a local virtual socket channel rather than ordinary IP networking. The highest reasonable scenario is a malicious KVM guest or local vsock peer supplying crafted virtio-vsock packets to a host vsock endpoint.\nAC:L - Once the attacker can supply virtio-vsock headers, repeatedly sending len=0 OP_RW packets with VIRTIO_VSOCK_SEQ_EOM deterministically bypasses payload accounting. No race, timing window, or rare memory layout condition is required.\nPR:N - The vhost-vsock receive path performs address/type/state validation but no host credential, capability, or authentication check before enqueueing the packet. A malicious guest/peer needs no privileges on the vulnerable host kernel to deliver crafted virtio-vsock packets.\nUI:N - No victim user action is required after a reachable vsock endpoint exists. The attacker can flood the receive queue directly.\nS:C - In the vhost-vsock deployment, guest-controlled packets consume host kernel memory, crossing the guest/host security boundary. This is a KVM guest-to-host denial-of-service scenario.\nC:N - The bug is unbounded skb queue growth from missing metadata accounting, not an out-of-bounds read, UAF, or data disclosure path. I found no confidentiality primitive.\nI:N - The flaw queues attacker-supplied zero-length skb metadata but does not corrupt memory or provide an arbitrary write/control-flow primitive. I found no integrity impact beyond denial of service.\nA:H - The receive queue can grow without the intended buffer-accounting limit, causing unbounded host kernel memory consumption. A sustained flood can drive OOM or host-wide service loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:26.330Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1eca304f97a34ed5e921e1f0e06c8b241f25bf12"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bdc637fde66b63d6cad0caacd034888bb7bf5f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/100d5b2ffdc6468b9e48532641f29e83efdcb63c"
        },
        {
          "url": "https://git.kernel.org/stable/c/059b7dbd20a6f0c539a45ddff1573cb8946685b5"
        }
      ],
      "title": "vsock/virtio: fix potential unbounded skb queue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53132",
    "datePublished": "2026-06-25T08:38:21.575Z",
    "dateReserved": "2026-06-09T07:44:35.386Z",
    "dateUpdated": "2026-08-05T12:33:26.330Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.