{"id":"CVE-2026-46321","summary":"tun: free page on short-frame rejection in tun_xdp_one()","details":"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.","modified":"2026-10-08T02:50:56.593471891Z","published":"2026-06-09T12:11:13.872Z","related":["SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3130-1","SUSE-SU-2026:3166-1","SUSE-SU-2026:3594-1","openSUSE-SU-2026:11014-1","openSUSE-SU-2026:21555-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46321.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46321.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46321"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6100e0237204890269e3f934acfc50d35fd6f319"},{"fixed":"0a6f46a9332ad6958992d64d3b3a81a80b2ca940"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2"},{"fixed":"0e8211fcf9426f5adddf32516ba0f400ceb9544d"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146"},{"fixed":"e915445942af6dcea628bf66d6241641201a0c41"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d5ad89b7d01ed4e66fd04734fc63d6e78536692a"},{"fixed":"5b34f9e4fe2f203724a6e893d6df0316b9670057"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"049584807f1d797fc3078b68035450a9769eb5c3"},{"fixed":"69863ff2720a0e9871f1a5710f2a33a94217fee0"},{"fixed":"37a1c268c2c8090bf4dc552d732bd23ba36f8eb0"},{"fixed":"98c67be9eb9de72465a071949e84a3cdb8fab5a3"},{"fixed":"f4feb1e20058e407cb00f45aff47f5b7e19a6bbf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.223"},{"fixed":"5.10.259"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.164"},{"fixed":"5.15.210"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.102"},{"fixed":"6.1.176"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.43"},{"fixed":"6.6.143"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.281"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.9.12"},{"fixed":"6.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.10.2"},{"fixed":"6.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"32b0aaba5dbc85816898167d9b5d45a22eae82e9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8418f55302fa1d2eeb73e16e345167e545c598a5"}]}],"versions":["v5.10.258","v5.10.257","v5.10.256","v5.10.255","v5.10.254","v5.10.253","v5.10.252","v5.10.251","v5.10.250","v5.10.249","v5.10.248","v5.10.247","v5.10.246","v5.10.245","v5.10.244","v5.10.243","v5.10.242","v5.10.241","v5.10.240","v5.10.239","v5.10.238","v5.10.237","v5.10.236","v5.10.235","v5.10.234","v5.10.233","v5.10.232","v5.10.231","v5.10.230","v5.10.229","v5.10.228","v5.10.227","v5.10.226","v5.10.225","v5.10.224","v5.10.223","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15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