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CVE-2022-48985 (GCVE-0-2022-48985)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-08-05 08:53
VLAI
Title
net: mana: Fix race on per-CQ variable napi work_done
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix race on per-CQ variable napi work_done After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be cleared, and another CPU can start napi thread and access per-CQ variable, cq->work_done. If the other thread (for example, from busy_poll) sets it to a value >= budget, this thread will continue to run when it should stop, and cause memory corruption and panic. To fix this issue, save the per-CQ work_done variable in a local variable before napi_complete_done(), so it won't be corrupted by a possible concurrent thread after napi_complete_done(). Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done variable race is fixed, so the driver is able to reliably support features like busy_poll.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:17 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e1b5683ff62e7b328317aec08869495992053e9d , < fe50a9bbeb1f042e756c5cfa7708112c944368de (git)
Affected: e1b5683ff62e7b328317aec08869495992053e9d , < 6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3 (git)
Affected: e1b5683ff62e7b328317aec08869495992053e9d , < 18010ff776fa42340efc428b3ea6d19b3e7c7b21 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.83 , ≤ 5.15.* (semver)
Unaffected: 6.0.13 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"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\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:17:23.603Z\"}}], \"cna\": {\"title\": \"net: mana: Fix race on per-CQ variable napi work_done\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\"}, \"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\\u2019s softirq from further packets) can overwrite cq-\u003ework_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\\u2019s 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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e1b5683ff62e7b328317aec08869495992053e9d\", \"lessThan\": \"fe50a9bbeb1f042e756c5cfa7708112c944368de\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e1b5683ff62e7b328317aec08869495992053e9d\", \"lessThan\": \"6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e1b5683ff62e7b328317aec08869495992053e9d\", \"lessThan\": \"18010ff776fa42340efc428b3ea6d19b3e7c7b21\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/ethernet/microsoft/mana/gdma.h\", \"drivers/net/ethernet/microsoft/mana/mana_en.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.0.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.0.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/microsoft/mana/gdma.h\", \"drivers/net/ethernet/microsoft/mana/mana_en.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003ework_done. If the other thread (for example, from busy_poll) sets\\nit to a value \u003e= 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\u0027t 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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.83\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.0.13\", \"versionStartIncluding\": \"5.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1\", \"versionStartIncluding\": \"5.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:53:15.213Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48985\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:53:15.213Z\", \"dateReserved\": \"2024-08-22T01:27:53.633Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T20:06:01.802Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.