278 lines
14 KiB
JSON
278 lines
14 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-2024-40937",
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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": "2024-07-12T12:17:45.584Z",
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"datePublished": "2024-07-12T12:25:13.807Z",
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"dateUpdated": "2026-08-05T11:34:07.395Z"
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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": "2026-08-05T11:34:07.395Z"
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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\ngve: Clear napi->skb before dev_kfree_skb_any()\n\ngve_rx_free_skb incorrectly leaves napi->skb referencing an skb after it\nis freed with dev_kfree_skb_any(). This can result in a subsequent call\nto napi_get_frags returning a dangling pointer.\n\nFix this by clearing napi->skb before the skb is freed."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The vulnerable code is the gVNIC DQO NAPI receive poll (`gve_rx_poll_dqo`), executed in softirq context for every frame arriving on the wire. gve is the primary NIC on Google Compute Engine instances that are routinely internet-facing, so a remote attacker reaches the code purely by sending packets.\nAC:L - The attacker controls both trigger ingredients — packet shape (large multi-buffer/RSC frames above rx_copybreak, malformed or truncated frames causing the device to set rx_error mid-packet) and the traffic volume that drives the GFP_ATOMIC allocation failures in gve_rx_append_frags/gve_rx_copy_ondemand. The error path can be provoked repeatedly at line rate until it lands.\nPR:N - There is no syscall, ioctl, socket, capability check or authentication anywhere on the path; the receive poll runs unconditionally on incoming frames. An entirely unauthenticated off-host attacker can reach it.\nUI:N - No victim action is required — the driver processes received packets automatically in softirq context. Simply having the interface up is sufficient.\nS:U - The corruption is confined to the kernel's own memory within the same security authority; there is no crossing of a VM, IOMMU or sandbox boundary. Standard kernel-level compromise is Unchanged.\nC:H - The stale napi->skb is a freed sk_buff on the heavily-sprayable skbuff_head_cache; the driver and the subsequent napi_gro_frags/GRO path read skb->head, skb->data, skb_headlen and skb_shinfo from reallocated memory, so attacker-groomed or unrelated kernel data is parsed and can be leaked out via the receive path.\nI:H - The dangling pointer is written through — skb_add_rx_frag updates len/data_len/truesize and skb_shinfo, and gve_rx_complete_skb writes hash, ip_summed, gso_type and gso_size into freed memory — giving a write-after-free into a general-purpose slab plus a subsequent double free, which is the classic basis for control-flow hijack and privilege escalation.\nA:H - Use of the freed sk_buff reliably produces slab corruption, KASAN splats, list corruption and kernel panics, and the double free of the skb compounds this. A remote attacker can crash the host repeatedly."
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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/ethernet/google/gve/gve_rx_dqo.c"
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],
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"versions": [
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{
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"version": "9b8dd5e5ea48bbb7532d20c4093a79d8283e4029",
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"lessThan": "75afd8724739ee5ed8165acde5f6ac3988b485cc",
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"status": "affected",
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"versionType": "git"
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"status": "affected",
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/ethernet/google/gve/gve_rx_dqo.c"
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],
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"versions": [
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{
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"version": "5.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.162",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.95",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.35",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.9.6",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"id": "CVE-2024-40937",
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"role": "CISA Coordinator",
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"options": [
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