{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74279",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74279"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "crypto: cavium/cpt - fix DMA cleanup using wrong loop index",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: cavium/cpt - fix DMA cleanup using wrong loop index\n\nThe sg_cleanup error path used list[i] instead of list[j] when unmapping\nDMA buffers, leaking successfully mapped entries and repeatedly unmapping\nthe failed one.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74279"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/23c6174e48f66fc10b998b0acdb406cb0caf5c80"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/23d3a7e896a1fe2d7a6bcb42f093948b79f8a198"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/28141f95ae93b18f9bfde953cb787fcb151fb9da"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8afd1007ef79898a6e010eaade97097e49405fce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b8a1e1f4e4071a62b20374028744e8cc8310d48"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb4d57b83356d4bd411b45ede3024e0ff42c9b5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d319b83b97b3585550d9ae592dfa78c755b6129e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9dbf173bd32d5f81b005008b682bfb50aa093455"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 10.0,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - On Cavium Thunder appliances the CPT VF skcipher driver is selected for in-kernel crypto on network-facing workloads (IPsec/xfrm ESP decrypt, NFS/RPC GSS-Kerberos), so remote peers can drive setup_sgio_components() by sending traffic that triggers hardware-accelerated AES/DES operations.\nAC:L - An attacker can reliably force the error path by fragmenting crypto buffers to raise incnt/outcnt and flooding concurrent encrypt/decrypt requests to exhaust IOMMU IOVAs, causing dma_map_single() to fail mid-loop; no uncontrollable victim state or race is required.\nPR:N - Exploitation requires no root or capabilities on the victim host; remote network peers sending IPsec or authenticated RPC traffic, or any local process using the kernel crypto API via AF_ALG sockets, can trigger the faulty DMA cleanup without admin privileges.\nUI:N - Exploitation is fully attacker-driven through automated network traffic or programmatic crypto requests and does not require any victim user action such as opening files or mounting filesystems.\nS:C - Leaked DMA mappings let the CPT PCI function continue bus-mastering kernel pages after software teardown, bypassing intended kernel DMA lifecycle and IOMMU-enforced device isolation boundaries when stale mappings target freed or repurposed memory.\nC:H - Unmapping failures leave active DMA translations while dma_addr metadata is cleared, allowing the CPT hardware to read kernel memory from freed or reallocated pages, providing a memory-corruption primitive that can disclose sensitive data.\nI:H - Stale bidirectional DMA mappings combined with bogus unmaps on DMA_MAPPING_ERROR can corrupt IOMMU state and let the accelerator write into kernel pages no longer owned by the request, enabling control of kernel memory contents.\nA:H - Repeated dma_unmap_single() on DMA_MAPPING_ERROR triggers WARN_ON in iommu_dma_unmap_phys, and accumulating leaked IOMMU mappings can exhaust DMA resources or panic the kernel during subsequent crypto operations."
    }
  }
}