CVE-2025-40028 (GCVE-0-2025-40028)
Vulnerability from cvelistv5
Published
2025-10-28 09:32
Modified
2025-10-28 09:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix double-free in dbitmap A process might fail to allocate a new bitmap when trying to expand its proc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap via dbitmap_free(). However, the driver calls dbitmap_free() again when the same process terminates, leading to a double-free error: ================================================================== BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c Free of addr ffff00000b7c1420 by task kworker/9:1/209 CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: kfree+0x164/0x31c binder_proc_dec_tmpref+0x2e0/0x55c binder_deferred_func+0xc24/0x1120 process_one_work+0x520/0xba4 [...] Allocated by task 448: __kmalloc_noprof+0x178/0x3c0 bitmap_zalloc+0x24/0x30 binder_open+0x14c/0xc10 [...] Freed by task 449: kfree+0x184/0x31c binder_inc_ref_for_node+0xb44/0xe44 binder_transaction+0x29b4/0x7fbc binder_thread_write+0x1708/0x442c binder_ioctl+0x1b50/0x2900 [...] ================================================================== Fix this issue by marking proc->map NULL in dbitmap_free().
References
Impacted products
Vendor Product Version
Linux Linux Version: 15d9da3f818cae676f822a04407d3c17b53357d2
Version: 15d9da3f818cae676f822a04407d3c17b53357d2
Version: 15d9da3f818cae676f822a04407d3c17b53357d2
Version: 15d9da3f818cae676f822a04407d3c17b53357d2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/dbitmap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c301ec61ce6f16e21a36b99225ca8a20c1591e10",
              "status": "affected",
              "version": "15d9da3f818cae676f822a04407d3c17b53357d2",
              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/dbitmap.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.52",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.12",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003edmap. 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-\u003emap NULL in dbitmap_free()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-28T09:32:35.681Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "binder: fix double-free in dbitmap",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40028",
    "datePublished": "2025-10-28T09:32:35.681Z",
    "dateReserved": "2025-04-16T07:20:57.152Z",
    "dateUpdated": "2025-10-28T09:32:35.681Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40028\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-28T10:15:42.447\",\"lastModified\":\"2025-10-30T15:05:32.197\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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-\u003edmap. 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-\u003emap NULL in dbitmap_free().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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