Vulnerability-Lookup

GHSA-XQCF-GWJ9-5C88

Vulnerability from github – Published: 2026-06-09 15:32 – Updated: 2026-06-19 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

tap: free page on error paths in tap_get_user_xdp()

tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk.

Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().

Severity

7.4 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46320"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T13:16:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntap: free page on error paths in tap_get_user_xdp()\n\ntap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,\nand returns -ENOMEM when build_skb() fails. Both paths jump to the err\nlabel without freeing the page that vhost_net_build_xdp() allocated for\nthe frame. tap_sendmsg() discards the per-buffer return value and always\nreturns 0, so vhost_tx_batch() takes the success path and never frees\nthe page; each rejected frame in a batch leaks one page-frag chunk.\n\nFree the page on both error paths, before the skb is built. This is the\ntap counterpart of the same leak in tun_xdp_one().",
  "id": "GHSA-xqcf-gwj9-5c88",
  "modified": "2026-06-19T15:33:14Z",
  "published": "2026-06-09T15:32:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46320"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-46320 (GCVE-0-2026-46320)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-08-05 12:31

Title

tap: free page on error paths in tap_get_user_xdp()

Summary

In the Linux kernel, the following vulnerability has been resolved: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk. Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8d03e65eb6cfbffec…
https://git.kernel.org/stable/c/f979971835dddbca8…
https://git.kernel.org/stable/c/3f52a86a482a69294…
https://git.kernel.org/stable/c/d30aac0fa00ca0afc…
https://git.kernel.org/stable/c/d68eab61944a9b082…
https://git.kernel.org/stable/c/e27c17346628cb568…
https://git.kernel.org/stable/c/18a84c35842e19cd3…
https://git.kernel.org/stable/c/3bcf7aec6a9d16438…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < 8d03e65eb6cfbffec471a6b65416f93679bf3286 (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < f979971835dddbca86cf99e3b2e2b94a408a1ab2 (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < 3f52a86a482a69294c50a5a2a097bd6f4104990a (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < d68eab61944a9b0826fa2e954e42db1aa3201b7a (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < e27c17346628cb56843a83f93ac63c314c00f388 (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < 18a84c35842e19cd3c5534d8cee73d31863f696d (git) Affected: 0efac27791ee068075d80f07c55a229b1335ce12 , < 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (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: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/tap.c"
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              "version": "0",
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "status": "unaffected",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntap: free page on error paths in tap_get_user_xdp()\n\ntap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,\nand returns -ENOMEM when build_skb() fails. Both paths jump to the err\nlabel without freeing the page that vhost_net_build_xdp() allocated for\nthe frame. tap_sendmsg() discards the per-buffer return value and always\nreturns 0, so vhost_tx_batch() takes the success path and never frees\nthe page; each rejected frame in a batch leaks one page-frag chunk.\n\nFree the page on both error paths, before the skb is built. This is the\ntap counterpart of the same leak in tun_xdp_one()."
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            "baseSeverity": "HIGH",
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              "value": "AV:A - The bug is reached when guest-originated TX data crosses the virtio/vhost-net/macvtap boundary into the host tap driver; this is the same adjacent virtual-network path as CVE-2024-41090, not a remote Internet packet to the host stack.\nAC:L - An attacker controls the virtio TX virtqueue and can reliably submit frames shorter than ETH_HLEN or force build_skb failures; each batch can leak up to 64 page-frags and be repeated in a tight loop without race conditions.\nPR:N - In the highest-impact cloud-KVM scenario, a malicious VM tenant needs no host credentials or capabilities\u2014only the ability to send packets from inside an already-provisioned guest using virtio-net.\nUI:N - Exploitation requires no action from the host administrator or any other user beyond normal VM operation; the guest attacker drives the virtqueue directly.\nS:C - The leak occurs in the host kernel while processing guest-supplied descriptors, crossing the VM/host security boundary and degrading host-wide availability beyond the guest\u2019s own security scope.\nC:N - This is a missing put_page on error paths causing page-frag retention; there is no out-of-bounds read, use-after-free, or other memory corruption that could disclose kernel data.\nI:N - No memory is corrupted or written beyond the leaked page allocation; the bug cannot be leveraged for arbitrary write, code execution, or integrity compromise.\nA:H - Sustained submission of short or failing frames leaks one page-frag per rejected buffer; at scale this exhausts host memory and can trigger OOM kills or host panic, matching the identical tun-side fix analysis."
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        "dateUpdated": "2026-08-05T12:31:15.165Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2"
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      "title": "tap: free page on error paths in tap_get_user_xdp()",
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    "cveId": "CVE-2026-46320",
    "datePublished": "2026-06-09T12:11:12.882Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-08-05T12:31:15.165Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-XQCF-GWJ9-5C88

CVE-2026-46320 (GCVE-0-2026-46320)

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