{"id":"CVE-2026-46321","revision":null,"records":[{"revision":"a6295a45ea1c4e0485694b8614c0676a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46321","aliases":[],"title":"tun: free page on short-frame rejection in tun_xdp_one()","description":"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.","state":0,"publishedAt":"2026-06-09T12:11:13.872+00:00","modifiedAt":"2026-10-15T01:21:35.519+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/tun.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6100e0237204890269e3f934acfc50d35fd6f319\",\n \"lessThan\": \"0a6f46a9332ad6958992d64d3b3a81a80b2ca940\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2\",\n \"lessThan\": \"0e8211fcf9426f5adddf32516ba0f400ceb9544d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146\",\n \"lessThan\": \"e915445942af6dcea628bf66d6241641201a0c41\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d5ad89b7d01ed4e66fd04734fc63d6e78536692a\",\n \"lessThan\": \"5b34f9e4fe2f203724a6e893d6df0316b9670057\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"049584807f1d797fc3078b68035450a9769eb5c3\",\n \"lessThan\": \"69863ff2720a0e9871f1a5710f2a33a94217fee0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"049584807f1d797fc3078b68035450a9769eb5c3\",\n \"lessThan\": \"37a1c268c2c8090bf4dc552d732bd23ba36f8eb0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"049584807f1d797fc3078b68035450a9769eb5c3\",\n \"lessThan\": \"98c67be9eb9de72465a071949e84a3cdb8fab5a3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"049584807f1d797fc3078b68035450a9769eb5c3\",\n \"lessThan\": \"f4feb1e20058e407cb00f45aff47f5b7e19a6bbf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"32b0aaba5dbc85816898167d9b5d45a22eae82e9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8418f55302fa1d2eeb73e16e345167e545c598a5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.223\",\n \"lessThan\": \"5.10.259\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.164\",\n \"lessThan\": \"5.15.210\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.102\",\n \"lessThan\": \"6.1.176\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.43\",\n \"lessThan\": \"6.6.143\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.281\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.9.12\",\n \"lessThan\": \"6.10\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.10.2\",\n \"lessThan\": \"6.11\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/net/tun.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.11\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.11\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.259\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940","https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d","https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41","https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057","https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0","https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0","https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3","https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46321","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46321","identifiers":["CVE-2026-46321"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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