CVE-2026-89992 (GCVE-0-2026-89992)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:33 – Updated: 2026-10-19 08:56
VLAI
Title
cpuidle: dt_idle_genpd: kfree() the original name allocation
Summary
In the Linux kernel, the following vulnerability has been resolved: cpuidle: dt_idle_genpd: kfree() the original name allocation dt_idle_pd_alloc() kasprintf()s the full node path, then points pd->name at kbasename() of that string. dt_idle_pd_free() kfree()s pd->name, which is no longer the start of the allocation. Copy the basename instead.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < 1312ae33b91430ec99e69cd3d47f0e50a4ebf54b (git)
Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < a38caa9ed0d5c61c17d88393b14b292199289c1f (git)
Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < 09d002c8fb0261d35ce9d8a705de5db034ee90b8 (git)
Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < b519dfce1998c323e54a56f911cf708d9ba0e076 (git)
Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < 3394c7ba23336bdb7ece29127130fd01731d42d8 (git)
Affected: 9d976d6721dfb525b81ce981e1363c70c0975aab , < 2b0ac85512b7f67479127b2713254490662eb13d (git)
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Linux Linux Affected: 5.18
Unaffected: 0 , < 5.18 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "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-\u003ename at kbasename() of that string. dt_idle_pd_free() kfree()s\npd-\u003ename, which is no longer the start of the allocation.\n\nCopy the basename instead."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "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-\u003ename 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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/2b0ac85512b7f67479127b2713254490662eb13d"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89992",
    "datePublished": "2026-09-16T10:33:05.925Z",
    "dateReserved": "2026-09-11T19:38:34.780Z",
    "dateUpdated": "2026-10-19T08:56:06.466Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-11-14",
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      "percentile": "0.07663"
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      "cve": "CVE-2026-89992",
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      "initial_release_date": "2026-09-17T01:02:59.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "cpuidle: dt_idle_genpd: kfree() the original name allocation",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89992.json",
      "version": "6"
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            "value": "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-\u003ename at kbasename() of that string. dt_idle_pd_free() kfree()s\npd-\u003ename, which is no longer the start of the allocation.\n\nCopy the basename instead."
          }
        ],
        "id": "CVE-2026-89992",
        "lastModified": "2026-10-19T09:18:46.363",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "current_release_date": "2026-11-06T01:27:30+00:00",
      "cve": "CVE-2026-89992",
      "id": "CVE-2026-89992",
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      "product_status:known_affected": "112",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cpuidle: dt_idle_genpd: kfree() the original name allocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89992.json",
      "version": "3"
    }
  }
}



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