{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "cveMetadata": {
    "cveId": "CVE-2025-40028",
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "dateUpdated": "2025-10-28T09:32:35.681Z",
    "dateReserved": "2025-04-16T07:20:57.152Z",
    "datePublished": "2025-10-28T09:32:35.681Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux",
        "dateUpdated": "2025-10-28T09:32:35.681Z"
      },
      "title": "binder: fix double-free in dbitmap",
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix double-free in dbitmap\n\nA process might fail to allocate a new bitmap when trying to expand its\nproc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap\nvia dbitmap_free(). However, the driver calls dbitmap_free() again when\nthe same process terminates, leading to a double-free error:\n\n  ==================================================================\n  BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c\n  Free of addr ffff00000b7c1420 by task kworker/9:1/209\n\n  CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  Workqueue: events binder_deferred_func\n  Call trace:\n   kfree+0x164/0x31c\n   binder_proc_dec_tmpref+0x2e0/0x55c\n   binder_deferred_func+0xc24/0x1120\n   process_one_work+0x520/0xba4\n  [...]\n\n  Allocated by task 448:\n   __kmalloc_noprof+0x178/0x3c0\n   bitmap_zalloc+0x24/0x30\n   binder_open+0x14c/0xc10\n  [...]\n\n  Freed by task 449:\n   kfree+0x184/0x31c\n   binder_inc_ref_for_node+0xb44/0xe44\n   binder_transaction+0x29b4/0x7fbc\n   binder_thread_write+0x1708/0x442c\n   binder_ioctl+0x1b50/0x2900\n  [...]\n  ==================================================================\n\nFix this issue by marking proc->map NULL in dbitmap_free()."
        }
      ],
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "programFiles": [
            "drivers/android/dbitmap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "15d9da3f818cae676f822a04407d3c17b53357d2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c301ec61ce6f16e21a36b99225ca8a20c1591e10"
            },
            {
              "version": "15d9da3f818cae676f822a04407d3c17b53357d2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0390633979969c54c0ce6a198d6f45cdbe2c84b1"
            },
            {
              "version": "15d9da3f818cae676f822a04407d3c17b53357d2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b781e5635a3398e2b64440371233c2c5102cd6cb"
            },
            {
              "version": "15d9da3f818cae676f822a04407d3c17b53357d2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3ebcd3460cad351f198c39c6edb4af519a0ed934"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "programFiles": [
            "drivers/android/dbitmap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.11",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.11"
            },
            {
              "version": "6.12.52",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.16.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "version": "6.17.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "version": "6.18-rc1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10"
        },
        {
          "url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934"
        }
      ]
    }
  }
}