Vulnerability-Lookup

GHSA-9244-GHQ8-MVQ4

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-19 15:31

Details

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: __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

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-50193"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:49Z",
    "severity": "MODERATE"
  },
  "details": "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",
  "id": "GHSA-9244-ghq8-mvq4",
  "modified": "2025-11-19T15:31:29Z",
  "published": "2025-06-18T12:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50193"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2478e36ec437a27f8a05bea9e4269a68c554e21f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96aa2a6a89618d850ef082e4268007e840c28769"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-50193 (GCVE-0-2022-50193)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:03 – Updated: 2026-05-11 19:14

Title

erofs: wake up all waiters after z_erofs_lzma_head ready

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>

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/2478e36ec437a27f8…
https://git.kernel.org/stable/c/96aa2a6a89618d850…
https://git.kernel.org/stable/c/2df7c4bd7c1d2bc5e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 622ceaddb7649ca328832f50ba1400af778d75fa , < 2478e36ec437a27f8a05bea9e4269a68c554e21f (git) Affected: 622ceaddb7649ca328832f50ba1400af778d75fa , < 96aa2a6a89618d850ef082e4268007e840c28769 (git) Affected: 622ceaddb7649ca328832f50ba1400af778d75fa , < 2df7c4bd7c1d2bc5ece5e9ed19dbd386810c2a65 (git)
Linux	Linux	Affected: 5.16 Unaffected: 0 , < 5.16 (semver) Unaffected: 5.18.18 , ≤ 5.18.* (semver) Unaffected: 5.19.2 , ≤ 5.19.* (semver) Unaffected: 6.0 , ≤ * (original_commit_for_fix)

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JSON

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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": "2026-05-11T19:14:35.492Z",
        "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": "2026-05-11T19:14:35.492Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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