Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-06-09 12:11

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

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/69863ff2720a0e987…
https://git.kernel.org/stable/c/37a1c268c2c8090bf…
https://git.kernel.org/stable/c/98c67be9eb9de7246…
https://git.kernel.org/stable/c/f4feb1e20058e407c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 69863ff2720a0e9871f1a5710f2a33a94217fee0 (git) Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0 (git) Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < 98c67be9eb9de72465a071949e84a3cdb8fab5a3 (git) Affected: 049584807f1d797fc3078b68035450a9769eb5c3 , < f4feb1e20058e407cb00f45aff47f5b7e19a6bbf (git) Affected: 32b0aaba5dbc85816898167d9b5d45a22eae82e9 (git) Affected: 6100e0237204890269e3f934acfc50d35fd6f319 (git) Affected: 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 (git) Affected: ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 (git) Affected: d5ad89b7d01ed4e66fd04734fc63d6e78536692a (git) Affected: a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb (git) Affected: 8418f55302fa1d2eeb73e16e345167e545c598a5 (git) Affected: 5.4.281 , < 5.5 (semver) Affected: 5.10.223 , < 5.11 (semver) Affected: 5.15.164 , < 5.16 (semver) Affected: 6.1.102 , < 6.2 (semver) Affected: 6.6.43 , < 6.7 (semver) Affected: 6.9.12 , < 6.10 (semver) Affected: 6.10.2 , < 6.11 (semver)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (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-rc6 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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              "versionType": "semver"
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              "version": "5.15.164",
              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "semver"
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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."
        }
      ],
      "providerMetadata": {
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
        }
      ],
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    "datePublished": "2026-06-09T12:11:13.872Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-06-09T12:11:13.872Z",
    "state": "PUBLISHED"
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  }
}

FKIE_CVE-2026-46321

Vulnerability from fkie_nvd - Published: 2026-06-09 13:16 - Updated: 2026-06-09 13:16

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "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": "2026-06-09T13:16:37.473",
  "metrics": {},
  "published": "2026-06-09T13:16:37.473",
  "references": [
    {
      "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/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/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-3QQH-VM6G-GHW6

Vulnerability from github – Published: 2026-06-09 15:32 – Updated: 2026-06-09 15:32

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-46321"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T13:16:37Z",
    "severity": null
  },
  "details": "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": "GHSA-3qqh-vm6g-ghw6",
  "modified": "2026-06-09T15:32:18Z",
  "published": "2026-06-09T15:32:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46321"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-46321

Vulnerability from csaf_microsoft - Published: 2026-06-02 00:00 - Updated: 2026-06-10 01:05

Summary

tun: free page on short-frame rejection in tun_xdp_one()

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-46321

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-46321 tun: free page on short-frame rejection in tun_xdp_one() - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46321.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "tun: free page on short-frame rejection in tun_xdp_one()",
    "tracking": {
      "current_release_date": "2026-06-10T01:05:47.000Z",
      "generator": {
        "date": "2026-06-10T07:02:18.587Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-46321",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-06-10T01:05:47.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.139.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.139.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-46321",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-46321 tun: free page on short-frame rejection in tun_xdp_one() - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46321.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-06-10T01:05:47.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "tun: free page on short-frame rejection in tun_xdp_one()"
    }
  ]
}

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.

Action not permitted

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

FKIE_CVE-2026-46321

GHSA-3QQH-VM6G-GHW6

MSRC_CVE-2026-46321

Tags

Sightings

Nomenclature