260 lines
15 KiB
JSON
260 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-35971",
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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": "2024-05-17T13:50:33.141Z",
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"datePublished": "2024-05-20T09:41:59.174Z",
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"dateUpdated": "2026-08-05T11:31:19.610Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:31:19.610Z"
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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: ks8851: Handle softirqs at the end of IRQ thread to fix hang\n\nThe ks8851_irq() thread may call ks8851_rx_pkts() in case there are\nany packets in the MAC FIFO, which calls netif_rx(). This netif_rx()\nimplementation is guarded by local_bh_disable() and local_bh_enable().\nThe local_bh_enable() may call do_softirq() to run softirqs in case\nany are pending. One of the softirqs is net_rx_action, which ultimately\nreaches the driver .start_xmit callback. If that happens, the system\nhangs. The entire call chain is below:\n\nks8851_start_xmit_par from netdev_start_xmit\nnetdev_start_xmit from dev_hard_start_xmit\ndev_hard_start_xmit from sch_direct_xmit\nsch_direct_xmit from __dev_queue_xmit\n__dev_queue_xmit from __neigh_update\n__neigh_update from neigh_update\nneigh_update from arp_process.constprop.0\narp_process.constprop.0 from __netif_receive_skb_one_core\n__netif_receive_skb_one_core from process_backlog\nprocess_backlog from __napi_poll.constprop.0\n__napi_poll.constprop.0 from net_rx_action\nnet_rx_action from __do_softirq\n__do_softirq from call_with_stack\ncall_with_stack from do_softirq\ndo_softirq from __local_bh_enable_ip\n__local_bh_enable_ip from netif_rx\nnetif_rx from ks8851_irq\nks8851_irq from irq_thread_fn\nirq_thread_fn from irq_thread\nirq_thread from kthread\nkthread from ret_from_fork\n\nThe hang happens because ks8851_irq() first locks a spinlock in\nks8851_par.c ks8851_lock_par() spin_lock_irqsave(&ksp->lock, ...)\nand with that spinlock locked, calls netif_rx(). Once the execution\nreaches ks8851_start_xmit_par(), it calls ks8851_lock_par() again\nwhich attempts to claim the already locked spinlock again, and the\nhang happens.\n\nMove the do_softirq() call outside of the spinlock protected section\nof ks8851_irq() by disabling BHs around the entire spinlock protected\nsection of ks8851_irq() handler. Place local_bh_enable() outside of\nthe spinlock protected section, so that it can trigger do_softirq()\nwithout the ks8851_par.c ks8851_lock_par() spinlock being held, and\nsafely call ks8851_start_xmit_par() without attempting to lock the\nalready locked spinlock.\n\nSince ks8851_irq() is protected by local_bh_disable()/local_bh_enable()\nnow, replace netif_rx() with __netif_rx() which is not duplicating the\nlocal_bh_disable()/local_bh_enable() calls."
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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 deadlock is triggered purely by a received Ethernet frame whose RX processing emits an immediate reply in softirq context — ICMP echo requests, TCP SYNs eliciting SYN-ACKs, and forwarded traffic all do this and are routable from an arbitrary remote host, not just the local segment. Per net/ stack guidance, bugs reachable via received packets are Network.\nAC:L - The attacker fully controls the trigger by sending a single packet that elicits a reply (ping, ARP request, TCP SYN); no race, memory layout, or victim state is involved, and the hang even occurs under ordinary legitimate traffic.\nPR:N - The vulnerable code runs in the NIC's threaded IRQ handler on raw packet reception, entirely before any socket, authentication, or authorization check — an unauthenticated remote attacker needs no credentials on the target.\nUI:N - No victim action is required; the packet is processed automatically by the driver's interrupt thread as soon as it arrives on the wire.\nS:U - The recursive spinlock acquisition deadlocks the kernel itself, with no crossing of a virtualization, IOMMU, or sandbox boundary — impact stays within the same security authority.\nC:N - The bug is a lock-recursion deadlock with no out-of-bounds access, no use-after-free, and no leaked data; the fix only reorders BH handling and switches to __netif_rx(), confirming no information is exposed.\nI:N - No memory is corrupted and no data is modified — the CPU simply spins forever on a lock it already holds, giving no write primitive of any kind.\nA:H - Re-acquiring the non-recursive spinlock taken with spin_lock_irqsave() wedges the CPU with local interrupts disabled, producing a full system hang (unrecoverable without watchdog reset on the typical single-core embedded boards using the KS8851 parallel bus)."
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}
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]
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}
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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/micrel/ks8851_common.c"
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