CVE-2022-50193 (GCVE-0-2022-50193)
Vulnerability from cvelistv5
Published
2025-06-18 11:03
Modified
2025-06-18 11:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: wake up all waiters after z_erofs_lzma_head ready When the user mounts the erofs second times, the decompression thread may hung. The problem happens due to a sequence of steps like the following: 1) Task A called z_erofs_load_lzma_config which obtain all of the node from the z_erofs_lzma_head. 2) At this time, task B called the z_erofs_lzma_decompress and wanted to get a node. But the z_erofs_lzma_head was empty, the Task B had to sleep. 3) Task A release nodes and push nodes into the z_erofs_lzma_head. But task B was still sleeping. One example report when the hung happens: task:kworker/u3:1 state:D stack:14384 pid: 86 ppid: 2 flags:0x00004000 Workqueue: erofs_unzipd z_erofs_decompressqueue_work Call Trace: <TASK> __schedule+0x281/0x760 schedule+0x49/0xb0 z_erofs_lzma_decompress+0x4bc/0x580 ? cpu_core_flags+0x10/0x10 z_erofs_decompress_pcluster+0x49b/0xba0 ? __update_load_avg_se+0x2b0/0x330 ? __update_load_avg_se+0x2b0/0x330 ? update_load_avg+0x5f/0x690 ? update_load_avg+0x5f/0x690 ? set_next_entity+0xbd/0x110 ? _raw_spin_unlock+0xd/0x20 z_erofs_decompress_queue.isra.0+0x2e/0x50 z_erofs_decompressqueue_work+0x30/0x60 process_one_work+0x1d3/0x3a0 worker_thread+0x45/0x3a0 ? process_one_work+0x3a0/0x3a0 kthread+0xe2/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30 </TASK>
References
Impacted products
Vendor Product Version
Linux Linux Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
Version: 622ceaddb7649ca328832f50ba1400af778d75fa
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor_lzma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2478e36ec437a27f8a05bea9e4269a68c554e21f",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "96aa2a6a89618d850ef082e4268007e840c28769",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            },
            {
              "lessThan": "2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65",
              "status": "affected",
              "version": "622ceaddb7649ca328832f50ba1400af778d75fa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/erofs/decompressor_lzma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.2",
              "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": "5.18.18",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.2",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: wake up all waiters after z_erofs_lzma_head ready\n\nWhen the user mounts the erofs second times, the decompression thread\nmay hung. The problem happens due to a sequence of steps like the\nfollowing:\n\n1) Task A called z_erofs_load_lzma_config which obtain all of the node\n   from the z_erofs_lzma_head.\n\n2) At this time, task B called the z_erofs_lzma_decompress and wanted to\n   get a node. But the z_erofs_lzma_head was empty, the Task B had to\n   sleep.\n\n3) Task A release nodes and push nodes into the z_erofs_lzma_head. But\n   task B was still sleeping.\n\nOne example report when the hung happens:\ntask:kworker/u3:1 state:D stack:14384 pid: 86 ppid: 2 flags:0x00004000\nWorkqueue: erofs_unzipd z_erofs_decompressqueue_work\nCall Trace:\n \u003cTASK\u003e\n __schedule+0x281/0x760\n schedule+0x49/0xb0\n z_erofs_lzma_decompress+0x4bc/0x580\n ? cpu_core_flags+0x10/0x10\n z_erofs_decompress_pcluster+0x49b/0xba0\n ? __update_load_avg_se+0x2b0/0x330\n ? __update_load_avg_se+0x2b0/0x330\n ? update_load_avg+0x5f/0x690\n ? update_load_avg+0x5f/0x690\n ? set_next_entity+0xbd/0x110\n ? _raw_spin_unlock+0xd/0x20\n z_erofs_decompress_queue.isra.0+0x2e/0x50\n z_erofs_decompressqueue_work+0x30/0x60\n process_one_work+0x1d3/0x3a0\n worker_thread+0x45/0x3a0\n ? process_one_work+0x3a0/0x3a0\n kthread+0xe2/0x110\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x22/0x30\n \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:03:38.262Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2478e36ec437a27f8a05bea9e4269a68c554e21f"
        },
        {
          "url": "https://git.kernel.org/stable/c/96aa2a6a89618d850ef082e4268007e840c28769"
        },
        {
          "url": "https://git.kernel.org/stable/c/2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65"
        }
      ],
      "title": "erofs: wake up all waiters after z_erofs_lzma_head ready",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50193",
    "datePublished": "2025-06-18T11:03:38.262Z",
    "dateReserved": "2025-06-18T10:57:27.428Z",
    "dateUpdated": "2025-06-18T11:03:38.262Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50193\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:49.920\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nerofs: wake up all waiters after z_erofs_lzma_head ready\\n\\nWhen the user mounts the erofs second times, the decompression thread\\nmay hung. The problem happens due to a sequence of steps like the\\nfollowing:\\n\\n1) Task A called z_erofs_load_lzma_config which obtain all of the node\\n   from the z_erofs_lzma_head.\\n\\n2) At this time, task B called the z_erofs_lzma_decompress and wanted to\\n   get a node. But the z_erofs_lzma_head was empty, the Task B had to\\n   sleep.\\n\\n3) Task A release nodes and push nodes into the z_erofs_lzma_head. But\\n   task B was still sleeping.\\n\\nOne example report when the hung happens:\\ntask:kworker/u3:1 state:D stack:14384 pid: 86 ppid: 2 flags:0x00004000\\nWorkqueue: erofs_unzipd z_erofs_decompressqueue_work\\nCall Trace:\\n \u003cTASK\u003e\\n __schedule+0x281/0x760\\n schedule+0x49/0xb0\\n z_erofs_lzma_decompress+0x4bc/0x580\\n ? cpu_core_flags+0x10/0x10\\n z_erofs_decompress_pcluster+0x49b/0xba0\\n ? __update_load_avg_se+0x2b0/0x330\\n ? __update_load_avg_se+0x2b0/0x330\\n ? update_load_avg+0x5f/0x690\\n ? update_load_avg+0x5f/0x690\\n ? set_next_entity+0xbd/0x110\\n ? _raw_spin_unlock+0xd/0x20\\n z_erofs_decompress_queue.isra.0+0x2e/0x50\\n z_erofs_decompressqueue_work+0x30/0x60\\n process_one_work+0x1d3/0x3a0\\n worker_thread+0x45/0x3a0\\n ? process_one_work+0x3a0/0x3a0\\n kthread+0xe2/0x110\\n ? kthread_complete_and_exit+0x20/0x20\\n ret_from_fork+0x22/0x30\\n \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: despierta a todos los que esperan despu\u00e9s de que z_erofs_lzma_head est\u00e9 listo Cuando el usuario monta erofs por segunda vez, el hilo de descompresi\u00f3n puede colgarse. El problema ocurre debido a una secuencia de pasos como la siguiente: 1) La tarea A llam\u00f3 a z_erofs_load_lzma_config que obtiene todos los nodos de z_erofs_lzma_head. 2) En este momento, la tarea B llam\u00f3 a z_erofs_lzma_decompress y quiso obtener un nodo. Pero z_erofs_lzma_head estaba vac\u00edo, la tarea B tuvo que dormir. 3) La tarea A libera nodos y los empuja hacia z_erofs_lzma_head. Pero la tarea B segu\u00eda durmiendo. Un ejemplo de informe cuando se produce el bloqueo: tarea:kworker/u3:1 estado:D pila:14384 pid: 86 ppid: 2 indicadores:0x00004000 Cola de trabajo: erofs_unzipd z_erofs_decompressqueue_work Seguimiento de llamadas:  __schedule+0x281/0x760 schedule+0x49/0xb0 z_erofs_lzma_decompress+0x4bc/0x580 ? cpu_core_flags+0x10/0x10 z_erofs_decompress_pcluster+0x49b/0xba0 ? __update_load_avg_se+0x2b0/0x330 ? __update_load_avg_se+0x2b0/0x330 ? update_load_avg+0x5f/0x690 ? update_load_avg+0x5f/0x690 ? set_next_entity+0xbd/0x110 ? _raw_spin_unlock+0xd/0x20 z_erofs_decompress_queue.isra.0+0x2e/0x50 z_erofs_decompressqueue_work+0x30/0x60 process_one_work+0x1d3/0x3a0 worker_thread+0x45/0x3a0 ? process_one_work+0x3a0/0x3a0 kthread+0xe2/0x110 ? kthread_complete_and_exit+0x20/0x20 ret_from_fork+0x22/0x30  \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2478e36ec437a27f8a05bea9e4269a68c554e21f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96aa2a6a89618d850ef082e4268007e840c28769\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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