CVE-2026-46322 (GCVE-0-2026-46322)
Vulnerability from cvelistv5
Published
2026-06-09 12:11
Modified
2026-10-19 19:36
Severity ?
7.1 (High) - CVSS:3.1/AV:L/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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
Version: 043d222f93ab8c76b56a3b315cd8692e35affb6c
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    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-10-19T19:36:58.325Z",
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This is a pure page reference leak with no out-of-bounds access, use-after-free, or attacker-readable disclosure; leaked pages remain in the kernel allocator and are not exposed to the attacker.\\nI:N - No memory corruption, arbitrary write, or control-flow hijack occurs; the only defect is failing to `put_page()` on the `build_skb()` error path.\\nA:H - Each failed `build_skb()` leaks a page-frag (~4 KiB), batches can hold up to 64 XDP buffers, and `tun_sendmsg()` masks per-buffer errors so leaks are unbounded and repeatable, enabling sustained host kernel memory exhaustion and OOM/DoS.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"793385c154771603b8671dd8338927221e9d8d78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"2638a9c1521905bb5c5d1e95c8fbc09f79148ed7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"60d9c0d6cdde5420d6483c921b16fe5465eb5238\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"d16e38fac09a47bfcf98c1ad65a1bb53f94540f5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"aa308e9dbb9acb17cacdbbce9e4504f69bac8385\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"4fefc6156a162a9f50035c12091a5e5130c82c6e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"043d222f93ab8c76b56a3b315cd8692e35affb6c\", \"lessThan\": \"aa8963fdce667a42fb7f0bdd2909fadcab02f9a8\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/tun.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\": \"6.12.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.35\", \"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/tun.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9\"}, {\"url\": \"https://git.kernel.org/stable/c/793385c154771603b8671dd8338927221e9d8d78\"}, {\"url\": \"https://git.kernel.org/stable/c/2638a9c1521905bb5c5d1e95c8fbc09f79148ed7\"}, {\"url\": \"https://git.kernel.org/stable/c/60d9c0d6cdde5420d6483c921b16fe5465eb5238\"}, {\"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"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\": \"6.12.93\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.35\", \"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\": \"2026-08-05T12:31:17.322Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-46322\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:36:58.325Z\", \"dateReserved\": \"2026-05-13T15:03:33.112Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-06-09T12:11:14.776Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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