{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48985", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.633Z", "datePublished": "2024-10-21T20:06:01.802Z", "dateUpdated": "2026-08-05T08:53:15.213Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:15.213Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Fix race on per-CQ variable napi work_done\n\nAfter calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be\ncleared, and another CPU can start napi thread and access per-CQ variable,\ncq->work_done. If the other thread (for example, from busy_poll) sets\nit to a value >= budget, this thread will continue to run when it should\nstop, and cause memory corruption and panic.\n\nTo fix this issue, save the per-CQ work_done variable in a local variable\nbefore napi_complete_done(), so it won't be corrupted by a possible\nconcurrent thread after napi_complete_done().\n\nAlso, add a flag bit to advertise to the NIC firmware: the NAPI work_done\nvariable race is fixed, so the driver is able to reliably support features\nlike busy_poll." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The bug is in MANA NAPI CQ polling on packet RX/TX completions; remote peers of internet-facing Azure VMs deliver traffic that raises interrupts and schedules the vulnerable mana_poll path. MANA RX NAPI uses weight 1, so remote packet-driven races after napi_complete_done are a network attack path.\nAC:L - After napi_complete_done clears SCHED, a concurrent NAPI (busy_poll or another CPU’s softirq from further packets) can overwrite cq->work_done; the attacker controls packet rate and can sustain load so the post-complete window is hit reliably. Race guidance treats attacker-influenced concurrent NAPI as AC:L.\nPR:N - Unauthenticated remote traffic to the MANA interface is enough to schedule softirq NAPI and induce the post-complete race; no local account, capabilities, or authentication is required.\nUI:N - Exploitation is driven by packet arrivals and kernel NAPI/softirq processing with no victim user action such as mounting a filesystem or opening a crafted file.\nS:U - Corruption and panic stay inside the guest kernel’s authority on the Azure VM; this is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - Wrong work_done after complete violates NAPI ownership and enables concurrent CQ polling, double-processing RX buffers, and page/skb UAF-style reuse, which conservatively yields an arbitrary read primitive.\nI:H - The same concurrent CQ/NAPI ownership break causes double dma_unmap/free and heap corruption that can be leveraged for writes and control-flow hijacking, so integrity is High.\nA:H - The fix commit documents memory corruption and panic; NAPI list/state corruption and UAF/oops under concurrent poll produce a full kernel availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/microsoft/mana/gdma.h", "drivers/net/ethernet/microsoft/mana/mana_en.c" ], "versions": [ { "version": "e1b5683ff62e7b328317aec08869495992053e9d", "lessThan": "fe50a9bbeb1f042e756c5cfa7708112c944368de", "status": "affected", "versionType": "git" }, { "version": "e1b5683ff62e7b328317aec08869495992053e9d", "lessThan": "6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3", "status": "affected", "versionType": "git" }, { "version": "e1b5683ff62e7b328317aec08869495992053e9d", "lessThan": "18010ff776fa42340efc428b3ea6d19b3e7c7b21", "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/microsoft/mana/gdma.h", "drivers/net/ethernet/microsoft/mana/mana_en.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.83", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.13", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.15", "versionEndExcluding": "5.15.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fe50a9bbeb1f042e756c5cfa7708112c944368de" }, { "url": "https://git.kernel.org/stable/c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3" }, { "url": "https://git.kernel.org/stable/c/18010ff776fa42340efc428b3ea6d19b3e7c7b21" } ], "title": "net: mana: Fix race on per-CQ variable napi work_done", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48985", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-10-22T13:17:20.394145Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:43.146Z" } } ] } }