{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-41091","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-12T12:17:45.636Z","datePublished":"2024-07-29T06:18:12.019Z","dateUpdated":"2026-08-05T11:35:19.663Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:35:19.663Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntun: add missing verification for short frame\n\nThe cited commit missed to check against the validity of the frame length\nin the tun_xdp_one() path, which could cause a corrupted skb to be sent\ndownstack. Even before the skb is transmitted, the\ntun_xdp_one-->eth_type_trans() may access the Ethernet header although it\ncan be less than ETH_HLEN. Once transmitted, this could either cause\nout-of-bound access beyond the actual length, or confuse the underlayer\nwith incorrect or inconsistent header length in the skb metadata.\n\nIn the alternative path, tun_get_user() already prohibits short frame which\nhas the length less than Ethernet header size from being transmitted for\nIFF_TAP.\n\nThis is to drop any frame shorter than the Ethernet header size just like\nhow tun_get_user() does.\n\nCVE: CVE-2024-41091"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is only reachable through the vhost-net TX ring driven by a local vhost_net file descriptor (or the guest attached to it), not through any network protocol handler; the attacker needs local access to /dev/vhost-net plus a tap backend, or local access inside a VM whose virtio-net device is backed by vhost-net.\nAC:L - Triggering is a single deterministic action — post a TX descriptor whose length equals sock_hlen so datasize is 0 — on the default configuration (sk_sndbuf == INT_MAX enables the batch XDP path, zerocopy TX is off by default); no race, no timing window, no memory-layout precondition.\nPR:L - No capability check exists anywhere in drivers/vhost, so opening /dev/vhost-net needs only file permissions (kvm group on typical hosts), and TUNSETIFF's ns_capable(CAP_NET_ADMIN) is trivially obtained via unshare -Urn; in the KVM scenario the attacker holds only guest-side privileges and none on the host.\nUI:N - The attacker drives the entire sequence — creating the tap, binding the vhost backend, and kicking the virtqueue — with no action required from any other user; a malicious guest needs only its own already-configured virtio-net device.\nS:C - In the standard KVM deployment, vhost-net/tun is the host-kernel component enforcing the guest's confinement to its virtual NIC, and a guest-supplied short frame corrupts host kernel memory and injects a malformed skb into the host's network stack, bridge and physical NIC — resources outside the guest's security authority, i.e. a guest-to-host boundary crossing.\nC:H - eth_skb_pull_mac()/eth_skb_pkt_type() dereference the Ethernet header past the end of the valid data, reading stale page-frag heap contents, and the resulting skb carries a length shorter than the headers it claims, so downstream forwarding onto a bridge or physical NIC can transmit adjacent kernel heap bytes and the unbounded downstream over-reads the commit warns about.\nI:H - A corrupted skb with inconsistent length/header metadata is passed into netif_receive_skb() and on through the host stack, where unsigned header-length arithmetic on skb->len < ETH_HLEN underflows and yields out-of-bounds accesses — memory corruption of this class is leveragable into write primitives and control-flow hijacking.\nA:H - The out-of-bounds access and the malformed skb entering the host network stack readily produce a host kernel oops or panic, and the trigger can be repeated at packet rate from an unprivileged guest, denying service to the host and every other guest on it."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/tun.c"],"versions":[{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"32b0aaba5dbc85816898167d9b5d45a22eae82e9","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"6100e0237204890269e3f934acfc50d35fd6f319","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"d5ad89b7d01ed4e66fd04734fc63d6e78536692a","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"8418f55302fa1d2eeb73e16e345167e545c598a5","status":"affected","versionType":"git"},{"version":"043d222f93ab8c76b56a3b315cd8692e35affb6c","lessThan":"049584807f1d797fc3078b68035450a9769eb5c3","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/tun.c"],"versions":[{"version":"4.20","status":"affected"},{"version":"0","lessThan":"4.20","status":"unaffected","versionType":"semver"},{"version":"5.4.281","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.223","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.164","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.102","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.43","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.9.12","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10.2","lessThanOrEqual":"6.10.*","status":"unaffected","versionType":"semver"},{"version":"6.11","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.281"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.223"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.164"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.102"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.43"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.9.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.10.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.11"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/32b0aaba5dbc85816898167d9b5d45a22eae82e9"},{"url":"https://git.kernel.org/stable/c/6100e0237204890269e3f934acfc50d35fd6f319"},{"url":"https://git.kernel.org/stable/c/589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2"},{"url":"https://git.kernel.org/stable/c/ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146"},{"url":"https://git.kernel.org/stable/c/d5ad89b7d01ed4e66fd04734fc63d6e78536692a"},{"url":"https://git.kernel.org/stable/c/a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb"},{"url":"https://git.kernel.org/stable/c/8418f55302fa1d2eeb73e16e345167e545c598a5"},{"url":"https://git.kernel.org/stable/c/049584807f1d797fc3078b68035450a9769eb5c3"}],"title":"tun: 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