359 lines
19 KiB
JSON
359 lines
19 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-41091",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-12T12:17:45.636Z",
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"datePublished": "2024-07-29T06:18:12.019Z",
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"dateUpdated": "2026-08-05T11:35:19.663Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:35:19.663Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/tun.c"
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],
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"versions": [
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{
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"version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "32b0aaba5dbc85816898167d9b5d45a22eae82e9",
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"status": "affected",
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"drivers/net/tun.c"
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"version": "0",
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"version": "5.4.281",
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},
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"version": "5.15.164",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"version": "6.11",
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"lessThanOrEqual": "*",
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"versionType": "original_commit_for_fix"
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}
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],
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"title": "tun: add missing verification for short frame",
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"id": "CVE-2024-41091",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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