223 lines
12 KiB
JSON
223 lines
12 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-2024-35901",
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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": "2024-05-17T13:50:33.114Z",
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"datePublished": "2024-05-19T08:34:54.879Z",
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"dateUpdated": "2026-08-05T11:30:52.091Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:30:52.091Z"
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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\nnet: mana: Fix Rx DMA datasize and skb_over_panic\n\nmana_get_rxbuf_cfg() aligns the RX buffer's DMA datasize to be\nmultiple of 64. So a packet slightly bigger than mtu+14, say 1536,\ncan be received and cause skb_over_panic.\n\nSample dmesg:\n[ 5325.237162] skbuff: skb_over_panic: text:ffffffffc043277a len:1536 put:1536 head:ff1100018b517000 data:ff1100018b517100 tail:0x700 end:0x6ea dev:<NULL>\n[ 5325.243689] ------------[ cut here ]------------\n[ 5325.245748] kernel BUG at net/core/skbuff.c:192!\n[ 5325.247838] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI\n[ 5325.258374] RIP: 0010:skb_panic+0x4f/0x60\n[ 5325.302941] Call Trace:\n[ 5325.304389] <IRQ>\n[ 5325.315794] ? skb_panic+0x4f/0x60\n[ 5325.317457] ? asm_exc_invalid_op+0x1f/0x30\n[ 5325.319490] ? skb_panic+0x4f/0x60\n[ 5325.321161] skb_put+0x4e/0x50\n[ 5325.322670] mana_poll+0x6fa/0xb50 [mana]\n[ 5325.324578] __napi_poll+0x33/0x1e0\n[ 5325.326328] net_rx_action+0x12e/0x280\n\nAs discussed internally, this alignment is not necessary. To fix\nthis bug, remove it from the code. So oversized packets will be\nmarked as CQE_RX_TRUNCATED by NIC, and dropped."
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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:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The bug is triggered purely by a received Ethernet frame processed in the MANA NIC's NAPI RX path, before any protocol demux or socket lookup, so a remote attacker anywhere on the routed network can reach it. On the very common Azure configuration where the VM MTU is set below the path MTU (VPN Gateway / ExpressRoute / AKS overlay guidance), ordinary full-size internet packets fall directly into the oversized window.\nAC:L - The attacker fully controls the only variable that matters — packet length — and can simply sweep sizes until one lands in the (mtu+14, ALIGN(mtu+14,64)] window, which is non-empty for the default MTU 1500. No race, no memory-layout grooming, and no state outside the attacker's control is involved.\nPR:N - No authentication or credentials of any kind are needed; the panic occurs in mana_build_skb() before eth_type_trans() and before netfilter, so the frame need not even be addressed to a listening service or survive a firewall rule. Any unauthenticated party able to send a frame to the interface triggers it.\nUI:N - Triggering requires only that the victim's interface be up and receiving; the panic happens in softirq context during normal packet reception with no action by any local user or administrator.\nS:U - The vulnerable code and the impacted resource are both the host kernel — a standard in-kernel crash with no crossing of a VM, IOMMU, or sandbox security authority.\nC:N - No data is disclosed to the attacker: the overlong DMA writes the attacker's own packet bytes into the buffer's skb_shared_info scratch area within the same allocation, and skb_over_panic() aborts immediately, so no kernel memory is read back or leaked over the wire.\nI:N - The excess DMA stays inside the allocated page/fragment, targets a region that is not a live object at DMA time and is re-zeroed by napi_build_skb(), and every packet reaching it hits the unconditional BUG() in the same call path — so no adjacent object is corrupted and no write primitive is obtained.\nA:H - skb_put() detects tail > end and calls skb_over_panic() → BUG() from within NAPI/softirq context, producing a fatal exception in interrupt and a full kernel panic. A single crafted packet takes the machine down, and it can be repeated at will against every affected Azure VM."
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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/microsoft/mana/mana_en.c",
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"include/net/mana/mana.h"
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],
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"include/net/mana/mana.h"
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"version": "6.6.26",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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"version": "6.8.5",
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"lessThanOrEqual": "6.8.*",
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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",
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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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"title": "net: mana: Fix Rx DMA datasize and skb_over_panic",
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