CVE-2026-46322 (GCVE-0-2026-46322)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:11 – Updated: 2026-06-09 12:11
VLAI
Title
tun: free page on build_skb failure in tun_xdp_one()
Summary
In the Linux kernel, the following vulnerability has been resolved: tun: free page on build_skb failure in tun_xdp_one() When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk. Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 043d222f93ab8c76b56a3b315cd8692e35affb6c , < d16e38fac09a47bfcf98c1ad65a1bb53f94540f5 (git)
Affected: 043d222f93ab8c76b56a3b315cd8692e35affb6c , < aa308e9dbb9acb17cacdbbce9e4504f69bac8385 (git)
Affected: 043d222f93ab8c76b56a3b315cd8692e35affb6c , < 4fefc6156a162a9f50035c12091a5e5130c82c6e (git)
Affected: 043d222f93ab8c76b56a3b315cd8692e35affb6c , < aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 (git)
Create a notification for this product.
Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": "d16e38fac09a47bfcf98c1ad65a1bb53f94540f5",
              "status": "affected",
              "version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
              "versionType": "git"
            },
            {
              "lessThan": "aa308e9dbb9acb17cacdbbce9e4504f69bac8385",
              "status": "affected",
              "version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
              "versionType": "git"
            },
            {
              "lessThan": "4fefc6156a162a9f50035c12091a5e5130c82c6e",
              "status": "affected",
              "version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
              "versionType": "git"
            },
            {
              "lessThan": "aa8963fdce667a42fb7f0bdd2909fadcab02f9a8",
              "status": "affected",
              "version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "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-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc6",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on build_skb failure in tun_xdp_one()\n\nWhen build_skb() fails in tun_xdp_one(), the function sets ret to\n-ENOMEM and jumps to the out label, which returns without freeing the\npage that vhost_net_build_xdp() allocated for the frame. As with the\nshort-frame rejection path, tun_sendmsg() discards the per-buffer error\nand still returns total_len, so vhost_tx_batch() takes the success path\nand never frees the page. Each build_skb() failure in a batch leaks one\npage-frag chunk.\n\nFree the page before taking the error path, matching the put_page() the\nother error exits of tun_xdp_one() already perform."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T12:11:14.776Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8"
        }
      ],
      "title": "tun: free page on build_skb failure in tun_xdp_one()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46322",
    "datePublished": "2026-06-09T12:11:14.776Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-06-09T12:11:14.776Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46322",
      "date": "2026-06-10",
      "epss": "0.00018",
      "percentile": "0.0478"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46322\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-09T13:16:37.603\",\"lastModified\":\"2026-06-09T13:16:37.603\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntun: free page on build_skb failure in tun_xdp_one()\\n\\nWhen build_skb() fails in tun_xdp_one(), the function sets ret to\\n-ENOMEM and jumps to the out label, which returns without freeing the\\npage that vhost_net_build_xdp() allocated for the frame. As with the\\nshort-frame rejection path, tun_sendmsg() discards the per-buffer error\\nand still returns total_len, so vhost_tx_batch() takes the success path\\nand never frees the page. Each build_skb() failure in a batch leaks one\\npage-frag chunk.\\n\\nFree the page before taking the error path, matching the put_page() the\\nother error exits of tun_xdp_one() already perform.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
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.