Vulnerability-Lookup

FKIE_CVE-2023-52982

Vulnerability from fkie_nvd - Published: 2025-03-27 17:15 - Updated: 2026-06-17 06:44

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: fscache: Use wait_on_bit() to wait for the freeing of relinquished volume The freeing of relinquished volume will wake up the pending volume acquisition by using wake_up_bit(), however it is mismatched with wait_var_event() used in fscache_wait_on_volume_collision() and it will never wake up the waiter in the wait-queue because these two functions operate on different wait-queues. According to the implementation in fscache_wait_on_volume_collision(), if the wake-up of pending acquisition is delayed longer than 20 seconds (e.g., due to the delay of on-demand fd closing), the first wait_var_event_timeout() will timeout and the following wait_var_event() will hang forever as shown below: FS-Cache: Potential volume collision new=00000024 old=00000022 ...... INFO: task mount:1148 blocked for more than 122 seconds. Not tainted 6.1.0-rc6+ #1 task:mount state:D stack:0 pid:1148 ppid:1 Call Trace: <TASK> __schedule+0x2f6/0xb80 schedule+0x67/0xe0 fscache_wait_on_volume_collision.cold+0x80/0x82 __fscache_acquire_volume+0x40d/0x4e0 erofs_fscache_register_volume+0x51/0xe0 [erofs] erofs_fscache_register_fs+0x19c/0x240 [erofs] erofs_fc_fill_super+0x746/0xaf0 [erofs] vfs_get_super+0x7d/0x100 get_tree_nodev+0x16/0x20 erofs_fc_get_tree+0x20/0x30 [erofs] vfs_get_tree+0x24/0xb0 path_mount+0x2fa/0xa90 do_mount+0x7c/0xa0 __x64_sys_mount+0x8b/0xe0 do_syscall_64+0x30/0x60 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Considering that wake_up_bit() is more selective, so fix it by using wait_on_bit() instead of wait_var_event() to wait for the freeing of relinquished volume. In addition because waitqueue_active() is used in wake_up_bit() and clear_bit() doesn't imply any memory barrier, use clear_and_wake_up_bit() to add the missing memory barrier between cursor->flags and waitqueue_active().

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3be069f42a7b79d3149194f21cdf24bf23864cac	Patch
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8226e37d82f43657da34dd770e2b38f20242ada7	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	6.2
linux	linux_kernel	6.2
linux	linux_kernel	6.2
linux	linux_kernel	6.2
linux	linux_kernel	6.2
linux	linux_kernel	6.2

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fscache/volume.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3be069f42a7b79d3149194f21cdf24bf23864cac",
              "status": "affected",
              "version": "62ab63352350e881ae693a8236b35d7d0516c78b",
              "versionType": "git"
            },
            {
              "lessThan": "8226e37d82f43657da34dd770e2b38f20242ada7",
              "status": "affected",
              "version": "62ab63352350e881ae693a8236b35d7d0516c78b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fscache/volume.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "15D484CF-DA6C-44F0-9BCE-F29F5D48ABE2",
              "versionEndExcluding": "6.1.11",
              "versionStartIncluding": "5.17",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "FF501633-2F44-4913-A8EE-B021929F49F6",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "2BDA597B-CAC1-4DF0-86F0-42E142C654E9",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "725C78C9-12CE-406F-ABE8-0813A01D66E8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "A127C155-689C-4F67-B146-44A57F4BFD85",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc5:*:*:*:*:*:*",
              "matchCriteriaId": "D34127CC-68F5-4703-A5F6-5006F803E4AE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:rc6:*:*:*:*:*:*",
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            }
          ],
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        }
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscache: Use wait_on_bit() to wait for the freeing of relinquished volume\n\nThe freeing of relinquished volume will wake up the pending volume\nacquisition by using wake_up_bit(), however it is mismatched with\nwait_var_event() used in fscache_wait_on_volume_collision() and it will\nnever wake up the waiter in the wait-queue because these two functions\noperate on different wait-queues.\n\nAccording to the implementation in fscache_wait_on_volume_collision(),\nif the wake-up of pending acquisition is delayed longer than 20 seconds\n(e.g., due to the delay of on-demand fd closing), the first\nwait_var_event_timeout() will timeout and the following wait_var_event()\nwill hang forever as shown below:\n\n FS-Cache: Potential volume collision new=00000024 old=00000022\n ......\n INFO: task mount:1148 blocked for more than 122 seconds.\n       Not tainted 6.1.0-rc6+ #1\n task:mount           state:D stack:0     pid:1148  ppid:1\n Call Trace:\n  \u003cTASK\u003e\n  __schedule+0x2f6/0xb80\n  schedule+0x67/0xe0\n  fscache_wait_on_volume_collision.cold+0x80/0x82\n  __fscache_acquire_volume+0x40d/0x4e0\n  erofs_fscache_register_volume+0x51/0xe0 [erofs]\n  erofs_fscache_register_fs+0x19c/0x240 [erofs]\n  erofs_fc_fill_super+0x746/0xaf0 [erofs]\n  vfs_get_super+0x7d/0x100\n  get_tree_nodev+0x16/0x20\n  erofs_fc_get_tree+0x20/0x30 [erofs]\n  vfs_get_tree+0x24/0xb0\n  path_mount+0x2fa/0xa90\n  do_mount+0x7c/0xa0\n  __x64_sys_mount+0x8b/0xe0\n  do_syscall_64+0x30/0x60\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nConsidering that wake_up_bit() is more selective, so fix it by using\nwait_on_bit() instead of wait_var_event() to wait for the freeing of\nrelinquished volume. In addition because waitqueue_active() is used in\nwake_up_bit() and clear_bit() doesn\u0027t imply any memory barrier, use\nclear_and_wake_up_bit() to add the missing memory barrier between\ncursor-\u003eflags and waitqueue_active()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fscache: utilice wait_on_bit() para esperar la liberaci\u00f3n del volumen cedido. La liberaci\u00f3n del volumen cedido activar\u00e1 la adquisici\u00f3n de volumen pendiente mediante wake_up_bit(), sin embargo no coincide con wait_var_event() utilizado en fscache_wait_on_volume_collision() y nunca activar\u00e1 al que espera en la cola de espera porque estas dos funciones operan en colas de espera diferentes. Seg\u00fan la implementaci\u00f3n en fscache_wait_on_volume_collision(), si la activaci\u00f3n de una adquisici\u00f3n pendiente se demora m\u00e1s de 20 segundos (por ejemplo, debido a la demora en el cierre del fd a pedido), el primer wait_var_event_timeout() expirar\u00e1 y el siguiente wait_var_event() se colgar\u00e1 para siempre como se muestra a continuaci\u00f3n: FS-Cache: Potencial colisi\u00f3n de volumen nuevo=00000024 antiguo=00000022 ...... INFORMACI\u00d3N: montaje de tarea: 1148 bloqueado durante m\u00e1s de 122 segundos. No contaminado 6.1.0-rc6+ #1 task:mount state:D stack:0 pid:1148 ppid:1 Call Trace:  __schedule+0x2f6/0xb80 schedule+0x67/0xe0 fscache_wait_on_volume_collision.cold+0x80/0x82 __fscache_acquire_volume+0x40d/0x4e0 erofs_fscache_register_volume+0x51/0xe0 [erofs] erofs_fscache_register_fs+0x19c/0x240 [erofs] erofs_fc_fill_super+0x746/0xaf0 [erofs] vfs_get_super+0x7d/0x100 get_tree_nodev+0x16/0x20 erofs_fc_get_tree+0x20/0x30 [erofs] vfs_get_tree+0x24/0xb0 path_mount+0x2fa/0xa90 do_mount+0x7c/0xa0 __x64_sys_mount+0x8b/0xe0 do_syscall_64+0x30/0x60 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Considering that wake_up_bit() es m\u00e1s selectivo, corr\u00edjalo utilizando wait_on_bit() en lugar de wait_var_event() para esperar la liberaci\u00f3n del volumen cedido. Adem\u00e1s, debido a que waitqueue_active() se usa en wake_up_bit() y clear_bit() no implica ninguna barrera de memoria, use clear_and_wake_up_bit() para agregar la barrera de memoria faltante entre cursor-\u0026gt;flags y waitqueue_active()."
    }
  ],
  "id": "CVE-2023-52982",
  "lastModified": "2026-06-17T06:44:03.057",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-03-27T17:15:45.437",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3be069f42a7b79d3149194f21cdf24bf23864cac"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/8226e37d82f43657da34dd770e2b38f20242ada7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2023-52982 (GCVE-0-2023-52982)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-05-11 19:36

Title

fscache: Use wait_on_bit() to wait for the freeing of relinquished volume

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/3be069f42a7b79d31…
https://git.kernel.org/stable/c/8226e37d82f43657d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 62ab63352350e881ae693a8236b35d7d0516c78b , < 3be069f42a7b79d3149194f21cdf24bf23864cac (git) Affected: 62ab63352350e881ae693a8236b35d7d0516c78b , < 8226e37d82f43657da34dd770e2b38f20242ada7 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.11 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fscache/volume.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3be069f42a7b79d3149194f21cdf24bf23864cac",
              "status": "affected",
              "version": "62ab63352350e881ae693a8236b35d7d0516c78b",
              "versionType": "git"
            },
            {
              "lessThan": "8226e37d82f43657da34dd770e2b38f20242ada7",
              "status": "affected",
              "version": "62ab63352350e881ae693a8236b35d7d0516c78b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fscache/volume.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.11",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfscache: Use wait_on_bit() to wait for the freeing of relinquished volume\n\nThe freeing of relinquished volume will wake up the pending volume\nacquisition by using wake_up_bit(), however it is mismatched with\nwait_var_event() used in fscache_wait_on_volume_collision() and it will\nnever wake up the waiter in the wait-queue because these two functions\noperate on different wait-queues.\n\nAccording to the implementation in fscache_wait_on_volume_collision(),\nif the wake-up of pending acquisition is delayed longer than 20 seconds\n(e.g., due to the delay of on-demand fd closing), the first\nwait_var_event_timeout() will timeout and the following wait_var_event()\nwill hang forever as shown below:\n\n FS-Cache: Potential volume collision new=00000024 old=00000022\n ......\n INFO: task mount:1148 blocked for more than 122 seconds.\n       Not tainted 6.1.0-rc6+ #1\n task:mount           state:D stack:0     pid:1148  ppid:1\n Call Trace:\n  \u003cTASK\u003e\n  __schedule+0x2f6/0xb80\n  schedule+0x67/0xe0\n  fscache_wait_on_volume_collision.cold+0x80/0x82\n  __fscache_acquire_volume+0x40d/0x4e0\n  erofs_fscache_register_volume+0x51/0xe0 [erofs]\n  erofs_fscache_register_fs+0x19c/0x240 [erofs]\n  erofs_fc_fill_super+0x746/0xaf0 [erofs]\n  vfs_get_super+0x7d/0x100\n  get_tree_nodev+0x16/0x20\n  erofs_fc_get_tree+0x20/0x30 [erofs]\n  vfs_get_tree+0x24/0xb0\n  path_mount+0x2fa/0xa90\n  do_mount+0x7c/0xa0\n  __x64_sys_mount+0x8b/0xe0\n  do_syscall_64+0x30/0x60\n  entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nConsidering that wake_up_bit() is more selective, so fix it by using\nwait_on_bit() instead of wait_var_event() to wait for the freeing of\nrelinquished volume. In addition because waitqueue_active() is used in\nwake_up_bit() and clear_bit() doesn\u0027t imply any memory barrier, use\nclear_and_wake_up_bit() to add the missing memory barrier between\ncursor-\u003eflags and waitqueue_active()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:36:21.225Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3be069f42a7b79d3149194f21cdf24bf23864cac"
        },
        {
          "url": "https://git.kernel.org/stable/c/8226e37d82f43657da34dd770e2b38f20242ada7"
        }
      ],
      "title": "fscache: Use wait_on_bit() to wait for the freeing of relinquished volume",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-52982",
    "datePublished": "2025-03-27T16:43:20.735Z",
    "dateReserved": "2025-03-27T16:40:15.740Z",
    "dateUpdated": "2026-05-11T19:36:21.225Z",
    "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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.