{"id":"AZL-47192","summary":"CVE-2024-42071 affecting package kernel for versions less than 6.6.43.1-7","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nionic: use dev_consume_skb_any outside of napi\n\nIf we're not in a NAPI softirq context, we need to be careful\nabout how we call napi_consume_skb(), specifically we need to\ncall it with budget==0 to signal to it that we're not in a\nsafe context.\n\nThis was found while running some configuration stress testing\nof traffic and a change queue config loop running, and this\ncurious note popped out:\n\n[ 4371.402645] BUG: using smp_processor_id() in preemptible [00000000] code: ethtool/20545\n[ 4371.402897] caller is napi_skb_cache_put+0x16/0x80\n[ 4371.403120] CPU: 25 PID: 20545 Comm: ethtool Kdump: loaded Tainted: G           OE      6.10.0-rc3-netnext+ #8\n[ 4371.403302] Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 01/23/2021\n[ 4371.403460] Call Trace:\n[ 4371.403613]  \u003cTASK\u003e\n[ 4371.403758]  dump_stack_lvl+0x4f/0x70\n[ 4371.403904]  check_preemption_disabled+0xc1/0xe0\n[ 4371.404051]  napi_skb_cache_put+0x16/0x80\n[ 4371.404199]  ionic_tx_clean+0x18a/0x240 [ionic]\n[ 4371.404354]  ionic_tx_cq_service+0xc4/0x200 [ionic]\n[ 4371.404505]  ionic_tx_flush+0x15/0x70 [ionic]\n[ 4371.404653]  ? ionic_lif_qcq_deinit.isra.23+0x5b/0x70 [ionic]\n[ 4371.404805]  ionic_txrx_deinit+0x71/0x190 [ionic]\n[ 4371.404956]  ionic_reconfigure_queues+0x5f5/0xff0 [ionic]\n[ 4371.405111]  ionic_set_ringparam+0x2e8/0x3e0 [ionic]\n[ 4371.405265]  ethnl_set_rings+0x1f1/0x300\n[ 4371.405418]  ethnl_default_set_doit+0xbb/0x160\n[ 4371.405571]  genl_family_rcv_msg_doit+0xff/0x130\n\t[...]\n\nI found that ionic_tx_clean() calls napi_consume_skb() which calls\nnapi_skb_cache_put(), but before that last call is the note\n    /* Zero budget indicate non-NAPI context called us, like netpoll */\nand\n    DEBUG_NET_WARN_ON_ONCE(!in_softirq());\n\nThose are pretty big hints that we're doing it wrong.  We can pass a\ncontext hint down through the calls to let ionic_tx_clean() know what\nwe're doing so it can call napi_consume_skb() correctly.","modified":"2026-04-21T04:32:50.987412Z","published":"2024-07-29T16:15:06Z","upstream":["CVE-2024-42071"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-42071"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.43.1-7"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-47192.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}