{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-42071","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-07-29T15:50:41.168Z","datePublished":"2024-07-29T15:52:34.714Z","dateUpdated":"2026-08-05T11:35:29.256Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:35:29.256Z"},"descriptions":[{"lang":"en","value":"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]  <TASK>\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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable path is only reached through local administrative netdev operations — ethtool netlink/ioctl (`ETHTOOL_MSG_RINGS_SET`, `ETHTOOL_MSG_CHANNELS_SET`), `ip link set down`, or MTU/XDP changes — all issued from the local system. Remote packets cannot invoke `ionic_txrx_deinit()`.\nAC:L - The attacker controls both sides of the race: they generate the TX traffic that leaves skbs pending on the queue and the softirq load on the CPU, and they issue the reconfiguration/down operations in a loop (exactly the \"traffic plus queue-config loop\" stress the reporter used). The path can be retriggered indefinitely with no attacker-uncontrollable precondition.\nPR:L - The gates are `GENL_UNS_ADMIN_PERM` / `ns_capable(net->user_ns, CAP_NET_ADMIN)`, which are namespace-scoped rather than requiring real root — an unprivileged user with CAP_NET_ADMIN in a user namespace owning a netns that holds an ionic SR-IOV VF (a common SmartNIC container/Kubernetes deployment) can reach it. Per kernel scoring guidance, namespace-reachable CAP_NET_ADMIN is Low, not High.\nUI:N - The attacker performs the queue reconfiguration and traffic generation entirely on their own; no action by any other user or administrator is required.\nS:U - The corruption is confined to kernel per-CPU allocator state within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Corrupting the unlocked per-CPU `napi_alloc_cache` lets a stale or duplicated `sk_buff` pointer be reissued by `napi_skb_cache_get()`, producing a use-after-free on an object whose contents are attacker-controlled network data — a reliable kernel memory disclosure primitive.\nI:H - The same race yields either a double-free/UAF of `sk_buff` objects or, when the `skb_count == NAPI_SKB_CACHE_SIZE` equality check is stepped over, out-of-bounds pointer writes past the end of `skb_cache[]` into adjacent per-CPU data — both are established arbitrary-write/control-flow-hijack primitives.\nA:H - Handing an already-freed or garbage skb pointer back into the network stack, or freeing pointers via `kmem_cache_free_bulk()` from a corrupted array, reliably oopses or panics the kernel; with `panic_on_warn` the accompanying `DEBUG_NET_WARN_ON_ONCE(!in_softirq())` splat alone halts the machine."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/pensando/ionic/ionic_dev.h","drivers/net/ethernet/pensando/ionic/ionic_lif.c","drivers/net/ethernet/pensando/ionic/ionic_txrx.c"],"versions":[{"version":"386e69865311044b576ff536c99c6ee9cc98a228","lessThan":"ef7646ed49fff962e97b276f4ab91327a67eeb5a","status":"affected","versionType":"git"},{"version":"386e69865311044b576ff536c99c6ee9cc98a228","lessThan":"84b767f9e34fdb143c09e66a2a20722fc2921821","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/ethernet/pensando/ionic/ionic_dev.h","drivers/net/ethernet/pensando/ionic/ionic_lif.c","drivers/net/ethernet/pensando/ionic/ionic_txrx.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.9.8","lessThanOrEqual":"6.9.*","status":"unaffected","versionType":"semver"},{"version":"6.10","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.9.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5a"},{"url":"https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821"}],"title":"ionic: use dev_consume_skb_any outside of napi","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T04:54:32.247Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/ef7646ed49fff962e97b276f4ab91327a67eeb5a","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/84b767f9e34fdb143c09e66a2a20722fc2921821","tags":["x_transferred"]}]},{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2024-42071","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T16:19:43.105233Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-11T17:33:58.060Z"}}]}}