CVE-2022-49939 (GCVE-0-2022-49939)
Vulnerability from cvelistv5
Published
2025-06-18 10:54
Modified
2025-06-18 10:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix UAF of ref->proc caused by race condition A transaction of type BINDER_TYPE_WEAK_HANDLE can fail to increment the reference for a node. In this case, the target proc normally releases the failed reference upon close as expected. However, if the target is dying in parallel the call will race with binder_deferred_release(), so the target could have released all of its references by now leaving the cleanup of the new failed reference unhandled. The transaction then ends and the target proc gets released making the ref->proc now a dangling pointer. Later on, ref->node is closed and we attempt to take spin_lock(&ref->proc->inner_lock), which leads to the use-after-free bug reported below. Let's fix this by cleaning up the failed reference on the spot instead of relying on the target to do so. ================================================================== BUG: KASAN: use-after-free in _raw_spin_lock+0xa8/0x150 Write of size 4 at addr ffff5ca207094238 by task kworker/1:0/590 CPU: 1 PID: 590 Comm: kworker/1:0 Not tainted 5.19.0-rc8 #10 Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: dump_backtrace.part.0+0x1d0/0x1e0 show_stack+0x18/0x70 dump_stack_lvl+0x68/0x84 print_report+0x2e4/0x61c kasan_report+0xa4/0x110 kasan_check_range+0xfc/0x1a4 __kasan_check_write+0x3c/0x50 _raw_spin_lock+0xa8/0x150 binder_deferred_func+0x5e0/0x9b0 process_one_work+0x38c/0x5f0 worker_thread+0x9c/0x694 kthread+0x188/0x190 ret_from_fork+0x10/0x20
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/binder.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "229f47603dd306bc0eb1a831439adb8e48bb0eae",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "06e5b43ca4dab06a92bf4c2f33766e6fb11b880a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "30d0901b307f27d36b2655fb3048cf31ee0e89c0",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "9629f2dfdb1dad294b468038ff8e161e94d0b609",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "c2a4b5dc8fa71af73bab704d0cac42ac39767ed6",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "603a47f2ae56bf68288784d3c0a8c5b8e0a827ed",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "a0e44c64b6061dda7e00b7c458e4523e2331b739",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/android/binder.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.213",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.66",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.293",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.258",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.213",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.142",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.66",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF of ref-\u003eproc caused by race condition\n\nA transaction of type BINDER_TYPE_WEAK_HANDLE can fail to increment the\nreference for a node. In this case, the target proc normally releases\nthe failed reference upon close as expected. However, if the target is\ndying in parallel the call will race with binder_deferred_release(), so\nthe target could have released all of its references by now leaving the\ncleanup of the new failed reference unhandled.\n\nThe transaction then ends and the target proc gets released making the\nref-\u003eproc now a dangling pointer. Later on, ref-\u003enode is closed and we\nattempt to take spin_lock(\u0026ref-\u003eproc-\u003einner_lock), which leads to the\nuse-after-free bug reported below. Let\u0027s fix this by cleaning up the\nfailed reference on the spot instead of relying on the target to do so.\n\n  ==================================================================\n  BUG: KASAN: use-after-free in _raw_spin_lock+0xa8/0x150\n  Write of size 4 at addr ffff5ca207094238 by task kworker/1:0/590\n\n  CPU: 1 PID: 590 Comm: kworker/1:0 Not tainted 5.19.0-rc8 #10\n  Hardware name: linux,dummy-virt (DT)\n  Workqueue: events binder_deferred_func\n  Call trace:\n   dump_backtrace.part.0+0x1d0/0x1e0\n   show_stack+0x18/0x70\n   dump_stack_lvl+0x68/0x84\n   print_report+0x2e4/0x61c\n   kasan_report+0xa4/0x110\n   kasan_check_range+0xfc/0x1a4\n   __kasan_check_write+0x3c/0x50\n   _raw_spin_lock+0xa8/0x150\n   binder_deferred_func+0x5e0/0x9b0\n   process_one_work+0x38c/0x5f0\n   worker_thread+0x9c/0x694\n   kthread+0x188/0x190\n   ret_from_fork+0x10/0x20"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T10:54:40.100Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/229f47603dd306bc0eb1a831439adb8e48bb0eae"
        },
        {
          "url": "https://git.kernel.org/stable/c/06e5b43ca4dab06a92bf4c2f33766e6fb11b880a"
        },
        {
          "url": "https://git.kernel.org/stable/c/30d0901b307f27d36b2655fb3048cf31ee0e89c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/9629f2dfdb1dad294b468038ff8e161e94d0b609"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2a4b5dc8fa71af73bab704d0cac42ac39767ed6"
        },
        {
          "url": "https://git.kernel.org/stable/c/603a47f2ae56bf68288784d3c0a8c5b8e0a827ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0e44c64b6061dda7e00b7c458e4523e2331b739"
        }
      ],
      "title": "binder: fix UAF of ref-\u003eproc caused by race condition",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49939",
    "datePublished": "2025-06-18T10:54:40.100Z",
    "dateReserved": "2025-05-01T14:05:17.255Z",
    "dateUpdated": "2025-06-18T10:54:40.100Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49939\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:20.793\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbinder: fix UAF of ref-\u003eproc caused by race condition\\n\\nA transaction of type BINDER_TYPE_WEAK_HANDLE can fail to increment the\\nreference for a node. In this case, the target proc normally releases\\nthe failed reference upon close as expected. However, if the target is\\ndying in parallel the call will race with binder_deferred_release(), so\\nthe target could have released all of its references by now leaving the\\ncleanup of the new failed reference unhandled.\\n\\nThe transaction then ends and the target proc gets released making the\\nref-\u003eproc now a dangling pointer. Later on, ref-\u003enode is closed and we\\nattempt to take spin_lock(\u0026ref-\u003eproc-\u003einner_lock), which leads to the\\nuse-after-free bug reported below. Let\u0027s fix this by cleaning up the\\nfailed reference on the spot instead of relying on the target to do so.\\n\\n  ==================================================================\\n  BUG: KASAN: use-after-free in _raw_spin_lock+0xa8/0x150\\n  Write of size 4 at addr ffff5ca207094238 by task kworker/1:0/590\\n\\n  CPU: 1 PID: 590 Comm: kworker/1:0 Not tainted 5.19.0-rc8 #10\\n  Hardware name: linux,dummy-virt (DT)\\n  Workqueue: events binder_deferred_func\\n  Call trace:\\n   dump_backtrace.part.0+0x1d0/0x1e0\\n   show_stack+0x18/0x70\\n   dump_stack_lvl+0x68/0x84\\n   print_report+0x2e4/0x61c\\n   kasan_report+0xa4/0x110\\n   kasan_check_range+0xfc/0x1a4\\n   __kasan_check_write+0x3c/0x50\\n   _raw_spin_lock+0xa8/0x150\\n   binder_deferred_func+0x5e0/0x9b0\\n   process_one_work+0x38c/0x5f0\\n   worker_thread+0x9c/0x694\\n   kthread+0x188/0x190\\n   ret_from_fork+0x10/0x20\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: arreglo UAF de ref-\u0026gt;proc causado por condici\u00f3n de ejecuci\u00f3n Una transacci\u00f3n de tipo BINDER_TYPE_WEAK_HANDLE puede fallar al incrementar la referencia para un nodo. En este caso, el proc objetivo normalmente libera la referencia fallida al cerrar como se espera. Sin embargo, si el objetivo est\u00e1 muriendo en paralelo la llamada competir\u00e1 con binder_deferred_release(), por lo que el objetivo podr\u00eda haber liberado todas sus referencias por ahora dejando la limpieza de la nueva referencia fallida sin manejar. La transacci\u00f3n entonces termina y el proc objetivo se libera haciendo que ref-\u0026gt;proc ahora sea un puntero colgante. M\u00e1s tarde, ref-\u0026gt;node se cierra e intentamos tomar spin_lock(\u0026amp;ref-\u0026gt;proc-\u0026gt;inner_lock), lo que lleva al error de Use-After-Free reportado a continuaci\u00f3n. Vamos a arreglar esto limpiando la referencia fallida en el acto en lugar de depender de que el objetivo lo haga. ====================================================================== ERROR: KASAN: Use-After-Free en _raw_spin_lock+0xa8/0x150 Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff5ca207094238 por la tarea kworker/1:0/590 CPU: 1 PID: 590 Comm: kworker/1:0 No contaminado 5.19.0-rc8 #10 Nombre del hardware: linux,dummy-virt (DT) Cola de trabajo: eventos binder_deferred_func Rastreo de llamadas: dump_backtrace.part.0+0x1d0/0x1e0 show_stack+0x18/0x70 dump_stack_lvl+0x68/0x84 print_report+0x2e4/0x61c kasan_report+0xa4/0x110 kasan_check_range+0xfc/0x1a4 __kasan_check_write+0x3c/0x50 _raw_spin_lock+0xa8/0x150 binder_deferred_func+0x5e0/0x9b0 process_one_work+0x38c/0x5f0 worker_thread+0x9c/0x694 kthread+0x188/0x190 ret_from_fork+0x10/0x20 \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06e5b43ca4dab06a92bf4c2f33766e6fb11b880a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/229f47603dd306bc0eb1a831439adb8e48bb0eae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30d0901b307f27d36b2655fb3048cf31ee0e89c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/603a47f2ae56bf68288784d3c0a8c5b8e0a827ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9629f2dfdb1dad294b468038ff8e161e94d0b609\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0e44c64b6061dda7e00b7c458e4523e2331b739\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2a4b5dc8fa71af73bab704d0cac42ac39767ed6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.