CVE-2026-43345 (GCVE-0-2026-43345)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:39 – Updated: 2026-08-05 12:27
VLAI
Title
net: ipa: fix event ring index not programmed for IPA v5.0+
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ipa: fix event ring index not programmed for IPA v5.0+ For IPA v5.0+, the event ring index field moved from CH_C_CNTXT_0 to CH_C_CNTXT_1. The v5.0 register definition intended to define this field in the CH_C_CNTXT_1 fmask array but used the old identifier of ERINDEX instead of CH_ERINDEX. Without a valid event ring, GSI channels could never signal transfer completions. This caused gsi_channel_trans_quiesce() to block forever in wait_for_completion(). At least for IPA v5.2 this resolves an issue seen where runtime suspend, system suspend, and remoteproc stop all hanged forever. It also meant the IPA data path was completely non functional.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: faf0678ec8a0aa9039d8b188d012206abd67dd5c , < ae8343a19ccb051d519dbb3a9082ddea9f0551d3 (git)
Affected: faf0678ec8a0aa9039d8b188d012206abd67dd5c , < 2bf18b643c4656413f7cfd5615af60a6b4e261da (git)
Affected: faf0678ec8a0aa9039d8b188d012206abd67dd5c , < 2d2dc166d55148cfcf8ae67b415f8d6d110e6fca (git)
Affected: faf0678ec8a0aa9039d8b188d012206abd67dd5c , < 34c988bb04cbdf093d2134e179433da49ffcd044 (git)
Affected: faf0678ec8a0aa9039d8b188d012206abd67dd5c , < 56007972c0b1e783ca714d6f1f4d6e66e531d21f (git)
Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipa: fix event ring index not programmed for IPA v5.0+\n\nFor IPA v5.0+, the event ring index field moved from CH_C_CNTXT_0 to\nCH_C_CNTXT_1. The v5.0 register definition intended to define this\nfield in the CH_C_CNTXT_1 fmask array but used the old identifier of\nERINDEX instead of CH_ERINDEX.\n\nWithout a valid event ring, GSI channels could never signal transfer\ncompletions. This caused gsi_channel_trans_quiesce() to block\nforever in wait_for_completion().\n\nAt least for IPA v5.2 this resolves an issue seen where runtime\nsuspend, system suspend, and remoteproc stop all hanged forever. It\nalso meant the IPA data path was completely non functional."
        }
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            "baseSeverity": "HIGH",
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:N - The affected IPA/GSI channels are the Qualcomm modem/RMNet network data path, including AP receive channels driven by packets arriving from the cellular/network side. A remote peer can send traffic to a configured affected device without reaching any ioctl or local-only control interface.\nAC:L - The failure is deterministic on IPA v5.0+ hardware because the channel event-ring index is never encoded into CH_C_CNTXT_1. No race, heap shaping, or attacker-uncontrolled timing is needed once the affected channel is programmed and used.\nPR:N - For the remote packet/data-path scenario, the attacker does not need local credentials or kernel capabilities. The relevant receive path is packet-driven after the device and modem interface are configured by the system.\nUI:N - No victim action is required beyond the affected device being online with its IPA modem data path configured. Traffic or normal power-management transitions can exercise the broken completion path.\nS:U - The impact remains within the same kernel/device security authority. This is not a VM escape, IOMMU bypass, or cross-sandbox boundary violation.\nC:N - The bug is an incorrect hardware register field mask that prevents completion signaling; I found no out-of-bounds access, use-after-free, or attacker-readable memory exposure. The event rings are driver-allocated DMA rings, not an arbitrary disclosure primitive.\nI:N - The observed and code-supported impact is loss of completion signaling and broken data-path operation, not attacker-controlled modification of kernel memory or persistent data. There is no evident arbitrary write or control-flow corruption primitive.\nA:H - Missing completions cause waits such as gsi_channel_trans_quiesce() to block forever, hanging runtime suspend, system suspend, and remoteproc stop. The IPA data path can also become completely nonfunctional, so availability impact is high."
            }
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      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "title": "net: ipa: fix event ring index not programmed for IPA v5.0+",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "datePublished": "2026-05-08T13:39:31.222Z",
    "dateReserved": "2026-05-01T14:12:56.003Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T12:51:05+00:00",
      "cve": "CVE-2026-43345",
      "id": "CVE-2026-43345",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ipa: fix event ring index not programmed for IPA v5.0+",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43345.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-24T02:26:59Z",
      "cve": "CVE-2026-43345",
      "id": "CVE-2026-43345",
      "initial_release_date": "2026-05-13T03:35:04Z",
      "product_status:first_fixed": "55",
      "product_status:known_affected": "441",
      "product_status:known_not_affected": "181",
      "product_status:recommended": "238",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43345",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43345.json",
      "version": "14"
    }
  }
}



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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.