FKIE_CVE-2026-46321

Vulnerability from fkie_nvd - Published: 2026-06-09 13:16 - Updated: 2026-06-19 13:16
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: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/tun.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0a6f46a9332ad6958992d64d3b3a81a80b2ca940",
              "status": "affected",
              "version": "6100e0237204890269e3f934acfc50d35fd6f319",
              "versionType": "git"
            },
            {
              "lessThan": "0e8211fcf9426f5adddf32516ba0f400ceb9544d",
              "status": "affected",
              "version": "589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2",
              "versionType": "git"
            },
            {
              "lessThan": "e915445942af6dcea628bf66d6241641201a0c41",
              "status": "affected",
              "version": "ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146",
              "versionType": "git"
            },
            {
              "lessThan": "5b34f9e4fe2f203724a6e893d6df0316b9670057",
              "status": "affected",
              "version": "d5ad89b7d01ed4e66fd04734fc63d6e78536692a",
              "versionType": "git"
            },
            {
              "lessThan": "69863ff2720a0e9871f1a5710f2a33a94217fee0",
              "status": "affected",
              "version": "049584807f1d797fc3078b68035450a9769eb5c3",
              "versionType": "git"
            },
            {
              "lessThan": "37a1c268c2c8090bf4dc552d732bd23ba36f8eb0",
              "status": "affected",
              "version": "049584807f1d797fc3078b68035450a9769eb5c3",
              "versionType": "git"
            },
            {
              "lessThan": "98c67be9eb9de72465a071949e84a3cdb8fab5a3",
              "status": "affected",
              "version": "049584807f1d797fc3078b68035450a9769eb5c3",
              "versionType": "git"
            },
            {
              "lessThan": "f4feb1e20058e407cb00f45aff47f5b7e19a6bbf",
              "status": "affected",
              "version": "049584807f1d797fc3078b68035450a9769eb5c3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "32b0aaba5dbc85816898167d9b5d45a22eae82e9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8418f55302fa1d2eeb73e16e345167e545c598a5",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.259",
              "status": "affected",
              "version": "5.10.223",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.210",
              "status": "affected",
              "version": "5.15.164",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.176",
              "status": "affected",
              "version": "6.1.102",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.143",
              "status": "affected",
              "version": "6.6.43",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.281",
              "versionType": "semver"
            },
            {
              "lessThan": "6.10",
              "status": "affected",
              "version": "6.9.12",
              "versionType": "semver"
            },
            {
              "lessThan": "6.11",
              "status": "affected",
              "version": "6.10.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/tun.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_xdp() allocated for it.\ntun_sendmsg() discards that -EINVAL and still returns total_len, so\nvhost_tx_batch() takes the success path and never frees the page; each\nshort frame in a batch leaks one page-frag chunk.\n\nA local process that can open /dev/net/tun and /dev/vhost-net can hit\nthis path: it attaches a tun/tap device as the vhost-net backend and\nfeeds TX descriptors whose length minus the virtio-net header is below\nETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a\ntight submission loop exhausts host memory and triggers an OOM panic.\nFree the page before returning -EINVAL, matching the XDP-program error\npath in the same function."
    }
  ],
  "id": "CVE-2026-46321",
  "lastModified": "2026-06-19T13:16:36.497",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 4.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-06-09T13:16:37.473",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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