CVE-2026-23069 (GCVE-0-2026-23069)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:07 – Updated: 2026-02-09 08:38
VLAI?
Title
vsock/virtio: fix potential underflow in virtio_transport_get_credit()
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential underflow in virtio_transport_get_credit() The credit calculation in virtio_transport_get_credit() uses unsigned arithmetic: ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); If the peer shrinks its advertised buffer (peer_buf_alloc) while bytes are in flight, the subtraction can underflow and produce a large positive value, potentially allowing more data to be queued than the peer can handle. Reuse virtio_transport_has_space() which already handles this case and add a comment to make it clear why we are doing that. [Stefano: use virtio_transport_has_space() instead of duplicating the code] [Stefano: tweak the commit message]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d96de882d6b99955604669d962ae14e94b66a551 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 02f9af192b98d15883c70dd41ac76d1b0217c899 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < d05bc313788f0684b27f0f5b60c52a844669b542 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < ec0f1b3da8061be3173d1c39faaf9504f91942c3 (git)
Affected: 06a8fc78367d070720af960dcecec917d3ae5f3b , < 3ef3d52a1a9860d094395c7a3e593f3aa26ff012 (git)
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    Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/vmw_vsock/virtio_transport_common.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "4.8"
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              "version": "6.6.122",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.68",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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                {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvsock/virtio: fix potential underflow in virtio_transport_get_credit()\n\nThe credit calculation in virtio_transport_get_credit() uses unsigned\narithmetic:\n\n  ret = vvs-\u003epeer_buf_alloc - (vvs-\u003etx_cnt - vvs-\u003epeer_fwd_cnt);\n\nIf the peer shrinks its advertised buffer (peer_buf_alloc) while bytes\nare in flight, the subtraction can underflow and produce a large\npositive value, potentially allowing more data to be queued than the\npeer can handle.\n\nReuse virtio_transport_has_space() which already handles this case and\nadd a comment to make it clear why we are doing that.\n\n[Stefano: use virtio_transport_has_space() instead of duplicating the code]\n[Stefano: tweak the commit message]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:38:08.392Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551"
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          "url": "https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012"
        }
      ],
      "title": "vsock/virtio: fix potential underflow in virtio_transport_get_credit()",
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23069",
    "datePublished": "2026-02-04T16:07:49.911Z",
    "dateReserved": "2026-01-13T15:37:45.954Z",
    "dateUpdated": "2026-02-09T08:38:08.392Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23069\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:17.610\",\"lastModified\":\"2026-02-06T17:16:23.017\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvsock/virtio: fix potential underflow in virtio_transport_get_credit()\\n\\nThe credit calculation in virtio_transport_get_credit() uses unsigned\\narithmetic:\\n\\n  ret = vvs-\u003epeer_buf_alloc - (vvs-\u003etx_cnt - vvs-\u003epeer_fwd_cnt);\\n\\nIf the peer shrinks its advertised buffer (peer_buf_alloc) while bytes\\nare in flight, the subtraction can underflow and produce a large\\npositive value, potentially allowing more data to be queued than the\\npeer can handle.\\n\\nReuse virtio_transport_has_space() which already handles this case and\\nadd a comment to make it clear why we are doing that.\\n\\n[Stefano: use virtio_transport_has_space() instead of duplicating the code]\\n[Stefano: tweak the commit message]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/02f9af192b98d15883c70dd41ac76d1b0217c899\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ef3d52a1a9860d094395c7a3e593f3aa26ff012\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d05bc313788f0684b27f0f5b60c52a844669b542\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d96de882d6b99955604669d962ae14e94b66a551\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec0f1b3da8061be3173d1c39faaf9504f91942c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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