{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89992",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89992"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "cpuidle: dt_idle_genpd: kfree() the original name allocation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpuidle: dt_idle_genpd: kfree() the original name allocation\n\ndt_idle_pd_alloc() kasprintf()s the full node path, then points\npd->name at kbasename() of that string. dt_idle_pd_free() kfree()s\npd->name, which is no longer the start of the allocation.\n\nCopy the basename instead.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/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": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89992"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1312ae33b91430ec99e69cd3d47f0e50a4ebf54b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a38caa9ed0d5c61c17d88393b14b292199289c1f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09d002c8fb0261d35ce9d8a705de5db034ee90b8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b519dfce1998c323e54a56f911cf708d9ba0e076"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3394c7ba23336bdb7ece29127130fd01731d42d8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b0ac85512b7f67479127b2713254490662eb13d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The invalid free is reached only from local PSCI and RISC-V SBI CPU idle genpd bring-up (psci_cpuidle_domain_probe and sbi_genpd_probe calling dt_idle_pd_alloc/dt_idle_pd_free) on ARM phones, automotive, and RISC-V boards; no network, Bluetooth, or USB receive path calls this code.\nAC:L - After dt_idle_pd_alloc() succeeds, pd->name is an interior kbasename() pointer into the kasprintf() buffer; any later psci_pd_init/sbi_pd_init unwind (ENOMEM from genpd_alloc_data or pd_provider, or of_genpd_add_provider_simple failure) deterministically kfree()s that pointer, with no race or layout lottery.\nPR:N - Both callers are builtin initcalls (core_initcall/arch_initcall) whose platform probe runs automatically on hierarchical CPU idle DT with no capability or credential check, so a Linux account is not required to reach the vulnerable unwind.\nUI:N - Probe and error unwind run during kernel initialization and deferred-probe retries; no victim needs to mount a filesystem, open a device, or load a module.\nS:U - The interior-pointer kfree corrupts host kernel SLUB state within the same security authority and does not escape a VM, bypass IOMMU, or cross another sandbox boundary.\nC:H - kfree() of an interior kasprintf() pointer is an invalid free that corrupts slab metadata and overlapping objects; that memory-corruption primitive can be groomed into arbitrary kernel memory disclosure.\nI:H - SLUB treats the misaligned interior address as an object and corrupts the freelist; heap grooming can produce overlapping allocations and write primitives enabling control-flow hijack, matching this CNA's invalid-free scoring.\nA:H - Debug and KASAN builds oops on the invalid free, and without them the corrupted slab commonly panics during CPU idle genpd bring-up, so availability impact is a kernel crash."
    }
  }
}