CVE-2026-46321 (GCVE-0-2026-46321)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-08-05 12:31
VLAI
Title
tun: free page on short-frame rejection in tun_xdp_one()
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6100e0237204890269e3f934acfc50d35fd6f319 , < 0a6f46a9332ad6958992d64d3b3a81a80b2ca940 (git)
Affected: 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 , < 0e8211fcf9426f5adddf32516ba0f400ceb9544d (git)
Affected: ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 , < e915445942af6dcea628bf66d6241641201a0c41 (git)
Affected: d5ad89b7d01ed4e66fd04734fc63d6e78536692a , < 5b34f9e4fe2f203724a6e893d6df0316b9670057 (git)
Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 69863ff2720a0e9871f1a5710f2a33a94217fee0 (git)
Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0 (git)
Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 98c67be9eb9de72465a071949e84a3cdb8fab5a3 (git)
Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < f4feb1e20058e407cb00f45aff47f5b7e19a6bbf (git)
Affected: 32b0aaba5dbc85816898167d9b5d45a22eae82e9 (git)
Affected: a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb (git)
Affected: 8418f55302fa1d2eeb73e16e345167e545c598a5 (git)
Affected: 5.10.223 , < 5.10.259 (semver)
Affected: 5.15.164 , < 5.15.210 (semver)
Affected: 6.1.102 , < 6.1.176 (semver)
Affected: 6.6.43 , < 6.6.143 (semver)
Affected: 5.4.281 , < 5.5 (semver)
Affected: 6.9.12 , < 6.10 (semver)
Affected: 6.10.2 , < 6.11 (semver)
Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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        {
          "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."
        }
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        {
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            "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"
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              "value": "AV:L - The flaw is reached via local host interfaces (/dev/net/tun and /dev/vhost-net ioctls/sendmsg) or from a KVM guest through virtio-net TX descriptors processed by vhost-net, not via remote network packets to the host stack.\nAC:L - An attacker reliably triggers the leak by repeatedly submitting TX frames whose length minus the virtio-net header is below ETH_HLEN; no races or attacker-uncontrollable layout conditions are required.\nPR:N - A malicious KVM guest on a host using vhost-net with a tun/tap backend needs no host privileges\u2014only the ability to craft short virtio-net TX descriptors\u2014while a direct host attacker can also obtain CAP_NET_ADMIN via unprivileged user namespaces.\nUI:N - Exploitation requires no victim interaction beyond normal VM or namespace operation; the attacker drives the vhost TX path directly in a tight loop.\nS:C - In the highest-impact cloud/KVM deployment, an unprivileged guest VM crosses the hypervisor security boundary to exhaust host kernel memory and panic the host, affecting resources outside the guest\u0027s security scope.\nC:N - The bug is a page-fragment memory leak with no out-of-bounds access, use-after-free, or information disclosure; freed pages are simply never returned to the allocator.\nI:N - No kernel memory corruption or data modification occurs; the only effect is unbounded consumption of page-frags leading to denial of service.\nA:H - Sustained submission of short batched frames leaks one page-frag per frame, exhausts host memory, and can trigger an OOM kernel panic as described in the fix commit."
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:16.239Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940"
        },
        {
          "url": "https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057"
        },
        {
          "url": "https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"
        },
        {
          "url": "https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"
        },
        {
          "url": "https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
        }
      ],
      "title": "tun: free page on short-frame rejection in tun_xdp_one()",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46321",
    "datePublished": "2026-06-09T12:11:13.872Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-08-05T12:31:16.239Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46321",
      "date": "2026-08-10",
      "epss": "0.00129",
      "percentile": "0.02911"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-26T01:41:11.000Z",
      "cve": "CVE-2026-46321",
      "id": "msrc_CVE-2026-46321",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "tun: free page on short-frame rejection in tun_xdp_one()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46321.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46321\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-09T13:16:37.473\",\"lastModified\":\"2026-07-23T08:10:00.137\",\"vulnStatus\":\"Analyzed\",\"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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ntun: liberar p\u00e1gina en el rechazo de tramas cortas en tun_xdp_one()\\n\\ntun_xdp_one() devuelve -EINVAL en una trama m\u00e1s corta que ETH_HLEN sin liberar la p\u00e1gina que vhost_net_build_xdp() asign\u00f3 para ella. tun_sendmsg() descarta ese -EINVAL y a\u00fan devuelve total_len, por lo que vhost_tx_batch() toma la ruta de \u00e9xito y nunca libera la p\u00e1gina; cada trama corta en un lote filtra un chunk de fragmento de p\u00e1gina.\\n\\nUn proceso local que puede abrir /dev/net/tun y /dev/vhost-net puede alcanzar esta ruta: adjunta un dispositivo tun/tap como el backend de vhost-net y alimenta descriptores TX cuya longitud menos el encabezado virtio-net est\u00e1 por debajo de ETH_HLEN. Cada kick filtra los chunks de fragmentos de p\u00e1gina para ese lote, y un bucle de env\u00edo ajustado agota la memoria del host y desencadena un p\u00e1nico OOM. Liberar la p\u00e1gina antes de devolver -EINVAL, coincidiendo con la ruta de error del programa XDP en la misma funci\u00f3n.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/tun.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6100e0237204890269e3f934acfc50d35fd6f319\",\"lessThan\":\"0a6f46a9332ad6958992d64d3b3a81a80b2ca940\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2\",\"lessThan\":\"0e8211fcf9426f5adddf32516ba0f400ceb9544d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146\",\"lessThan\":\"e915445942af6dcea628bf66d6241641201a0c41\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d5ad89b7d01ed4e66fd04734fc63d6e78536692a\",\"lessThan\":\"5b34f9e4fe2f203724a6e893d6df0316b9670057\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"049584807f1d797fc3078b68035450a9769eb5c3\",\"lessThan\":\"69863ff2720a0e9871f1a5710f2a33a94217fee0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"049584807f1d797fc3078b68035450a9769eb5c3\",\"lessThan\":\"37a1c268c2c8090bf4dc552d732bd23ba36f8eb0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"049584807f1d797fc3078b68035450a9769eb5c3\",\"lessThan\":\"98c67be9eb9de72465a071949e84a3cdb8fab5a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"049584807f1d797fc3078b68035450a9769eb5c3\",\"lessThan\":\"f4feb1e20058e407cb00f45aff47f5b7e19a6bbf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"32b0aaba5dbc85816898167d9b5d45a22eae82e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8418f55302fa1d2eeb73e16e345167e545c598a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.223\",\"lessThan\":\"5.10.259\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.164\",\"lessThan\":\"5.15.210\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.102\",\"lessThan\":\"6.1.176\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.43\",\"lessThan\":\"6.6.143\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.281\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.9.12\",\"lessThan\":\"6.10\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.10.2\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/tun.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":4.0}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.4.281\",\"versionEndExcluding\":\"5.5\",\"matchCriteriaId\":\"9247B8C6-D97A-4CCC-B960-AFD2F536EFC1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.223\",\"ver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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-05T14:45:31+00:00",
      "cve": "CVE-2026-46321",
      "id": "CVE-2026-46321",
      "initial_release_date": "2026-06-09T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tun: free page on short-frame rejection in tun_xdp_one()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46321.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:53:16Z",
      "cve": "CVE-2026-46321",
      "id": "CVE-2026-46321",
      "initial_release_date": "2026-06-10T02:25:49Z",
      "product_status:known_affected": "135",
      "product_status:known_not_affected": "103",
      "product_status:recommended": "102",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46321",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46321.json",
      "version": "6"
    }
  }
}



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Taxonomy of the tags.





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.