{ "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": [ { 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"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: add missing verification for short frame", 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