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CVE-2026-74309 (GCVE-0-2026-74309)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45
VLAI
Title
vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
Summary
In the Linux kernel, the following vulnerability has been resolved: vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler Look up the IRQ index in oct_hw->irqs instead of assuming irq - irqs[0]. This supports non-contiguous IRQ numbers and avoids incorrect ring indexing when irqs[0] is not the base.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 26f8ce06af6475b33b0bc60261e9f5027f9af58f , < 3ef0cfa77a3d526591be069850d186c255e3f0cc (git)
Affected: 26f8ce06af6475b33b0bc60261e9f5027f9af58f , < c6c7eae5de798442987619434171ac886035d57c (git)
Affected: 26f8ce06af6475b33b0bc60261e9f5027f9af58f , < 0d21a1d6375a05274291e32c1ab7cd57dbb69513 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/octeon_ep/octep_vdpa_main.c"
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              "operator": "OR"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler\n\nLook up the IRQ index in oct_hw-\u003eirqs instead of assuming\nirq - irqs[0]. This supports non-contiguous IRQ numbers and\navoids incorrect ring indexing when irqs[0] is not the base."
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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The bug is in octep_vdpa_intr_handler, entered when the Octeon vDPA virtio-net device raises MSI-X on queue activity; remote or guest-originated network traffic to an internet-facing VM/container backed by this hardware reliably drives that interrupt path on the host.\nAC:L - Once the vDPA device is active, Linux commonly assigns non-contiguous MSI-X Linux IRQ numbers, so the irq-irqs[0] miscalculation occurs automatically; an attacker only needs to send traffic to generate interrupts without influencing timing or layout.\nPR:N - Exploitation requires no host credentials: an unauthenticated remote attacker can trigger the handler by sending packets to a virtio-net endpoint already provisioned on Marvell Octeon vDPA hardware, without CAP_NET_ADMIN, root, or vDPA management access.\nUI:N - No victim interaction is required beyond normal automated network I/O to the exposed virtio-net interface; the attacker does not need the administrator or user to mount devices, click links, or perform any manual action.\nS:C - In the primary cloud/KVM deployment, guest or remote network traffic crosses the VM/host boundary to corrupt host kernel memory in the vDPA driver interrupt handler, enabling host compromise from tenant or external network reachability rather than staying within the guest security authority.\nC:H - Incorrect ring indexing can yield negative or out-of-bounds vqs[] indices, causing kernel heap reads via ioread8 on attacker-influenced or adjacent cb_notify_addr pointers and disclosure of surrounding kernel memory contents.\nI:H - The same out-of-bounds vqs[] access performs iowrite8 acknowledgements to wrong MMIO addresses and may invoke corrupted vqs[i].cb.callback function pointers, providing memory corruption primitives suitable for control-flow hijacking in interrupt context.\nA:H - Invalid indices lead to bad MMIO accesses and calls through corrupted callback pointers in hardirq context, which can immediately oops or panic the host kernel and deny service to all tenants on the machine."
            }
          ]
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      ],
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0d21a1d6375a05274291e32c1ab7cd57dbb69513"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74309",
    "datePublished": "2026-08-15T05:58:09.366Z",
    "dateReserved": "2026-08-15T05:44:03.883Z",
    "dateUpdated": "2026-08-17T05:45:41.596Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T10:01:24+00:00",
      "cve": "CVE-2026-74309",
      "id": "CVE-2026-74309",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74309.json",
      "version": "3"
    }
  }
}



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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

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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.


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