CVE-2026-64467 (GCVE-0-2026-64467)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-08-17 04:56
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rust_binder: use a u64 stride when cleaning up the offsets array Allocation's Drop walks the offsets array (binder_size_t = u64 entries), cleaning up the objects, but it used usize instead of u64 for both the stride and the per-entry read. On 64-bit kernels (usize == u64) this is harmless, but on 32-bit kernels it walks the 8-byte entries in 4-byte steps, iterating an N-entry array 2N times, and reads the always-zero high word as offset 0, cleaning up the object at offset 0 N extra times. As a result the referenced node or handle ends up with a lower reference count than it actually has (a refcount over-decrement), and binder's reference accounting is corrupted; for example, the owner can be notified of a strong reference release (BR_RELEASE) even though references still remain. Change the stride to u64, and read each entry as a u64, narrowing it to usize with try_into(). On 32-bit ARM, when this over-decrement would drive a count below zero, the driver's existing refcount guard refuses it and fires: rust_binder: Failure: refcount underflow!
References
Impacted products
Vendor Product Version
Linux Linux Version: eafedbc7c050c44744fbdf80bdf3315e860b7513
Version: eafedbc7c050c44744fbdf80bdf3315e860b7513
Version: eafedbc7c050c44744fbdf80bdf3315e860b7513
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/binder/allocation.rs"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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            {
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              "versionType": "git"
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/android/binder/allocation.rs"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
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                  "versionEndExcluding": "7.2",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: use a u64 stride when cleaning up the offsets array\n\nAllocation\u0027s Drop walks the offsets array (binder_size_t = u64 entries),\ncleaning up the objects, but it used usize instead of u64 for both the\nstride and the per-entry read.\n\nOn 64-bit kernels (usize == u64) this is harmless, but on 32-bit kernels\nit walks the 8-byte entries in 4-byte steps, iterating an N-entry array\n2N times, and reads the always-zero high word as offset 0, cleaning up\nthe object at offset 0 N extra times. As a result the referenced node or\nhandle ends up with a lower reference count than it actually has (a\nrefcount over-decrement), and binder\u0027s reference accounting is corrupted;\nfor example, the owner can be notified of a strong reference release\n(BR_RELEASE) even though references still remain.\n\nChange the stride to u64, and read each entry as a u64, narrowing it to\nusize with try_into().\n\nOn 32-bit ARM, when this over-decrement would drive a count below zero,\nthe driver\u0027s existing refcount guard refuses it and fires:\n\n  rust_binder: Failure: refcount underflow!"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through a local BINDER_WRITE_READ ioctl carrying a crafted Binder transaction.\nAC:L - The attacker controls object zero and the offsets count and can force synchronous cleanup with a later invalid object; no race or uncontrollable condition is required.\nPR:L - An ordinary process permitted to access the Binder device and invoke and transfer objects to the target can trigger the bug; no capability or administrative privilege is required.\nUI:N - A malformed later object makes transaction construction fail and invokes cleanup during the attacker\u0027s ioctl, without recipient or human action.\nS:C - Prematurely releasing an object owned by a more privileged Binder service can create a user-space use-after-free across the Android application sandbox boundary.\nC:H - The attacker can retain a handle after BR_RELEASE frees the owning service\u0027s object, then target the stale pointer and potentially obtain code execution and arbitrary access to privileged-process memory.\nI:H - Exploitation of the resulting stale Binder object can provide attacker-controlled code execution and arbitrary modification within the privileged owning service.\nA:H - Stale-object dispatch can crash a critical Binder service, and the trigger can be repeated to cause persistent service or system disruption."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:56:12.747Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/89b8cc948dce661af87527623b3a41cdd115e2f9"
        },
        {
          "url": "https://git.kernel.org/stable/c/74920b1b4e474ba7a4de4323c0458deec49d210b"
        },
        {
          "url": "https://git.kernel.org/stable/c/803c8a9502e9b97cd6ae937618ef4a8fd6274343"
        }
      ],
      "title": "rust_binder: use a u64 stride when cleaning up the offsets array",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64467",
    "datePublished": "2026-07-25T08:51:32.626Z",
    "dateReserved": "2026-07-19T15:36:31.790Z",
    "dateUpdated": "2026-08-17T04:56:12.747Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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