CVE-2026-46320 (GCVE-0-2026-46320)
Vulnerability from cvelistv5
Published
2026-06-09 12:11
Modified
2026-10-19 19:36
Severity ?
7.4 (High) - CVSS:3.1/AV:A/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: 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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
Version: 0efac27791ee068075d80f07c55a229b1335ce12
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"8d03e65eb6cfbffec471a6b65416f93679bf3286\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"f979971835dddbca86cf99e3b2e2b94a408a1ab2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"3f52a86a482a69294c50a5a2a097bd6f4104990a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"d30aac0fa00ca0afc3e08174cf7f974a66bdcf05\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"d68eab61944a9b0826fa2e954e42db1aa3201b7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"e27c17346628cb56843a83f93ac63c314c00f388\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"18a84c35842e19cd3c5534d8cee73d31863f696d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0efac27791ee068075d80f07c55a229b1335ce12\", \"lessThan\": \"3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/tap.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.259\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.143\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.94\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/tap.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286\"}, {\"url\": \"https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2\"}, {\"url\": \"https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a\"}, {\"url\": \"https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05\"}, {\"url\": \"https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a\"}, {\"url\": \"https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388\"}, {\"url\": \"https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d\"}, {\"url\": \"https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.94\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.36\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.12\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:31:15.165Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46320\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:36:58.167Z\", \"dateReserved\": \"2026-05-13T15:03:33.112Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-09T12:11:12.882Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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