CVE-2025-40196 (GCVE-0-2025-40196)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2026-10-15 01:09
VLAI
Title
fs: quota: create dedicated workqueue for quota_release_work
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: quota: create dedicated workqueue for quota_release_work There is a kernel panic due to WARN_ONCE when panic_on_warn is set. This issue occurs when writeback is triggered due to sync call for an opened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance is needed at sync path, flush for quota_release_work is triggered. By default quota_release_work is queued to "events_unbound" queue which does not have WQ_MEM_RECLAIM flag. During f2fs balance "writeback" workqueue tries to flush quota_release_work causing kernel panic due to MEM_RECLAIM flag mismatch errors. This patch creates dedicated workqueue with WQ_MEM_RECLAIM flag for work quota_release_work. ------------[ cut here ]------------ WARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148 Call trace: check_flush_dependency+0x13c/0x148 __flush_work+0xd0/0x398 flush_delayed_work+0x44/0x5c dquot_writeback_dquots+0x54/0x318 f2fs_do_quota_sync+0xb8/0x1a8 f2fs_write_checkpoint+0x3cc/0x99c f2fs_gc+0x190/0x750 f2fs_balance_fs+0x110/0x168 f2fs_write_single_data_page+0x474/0x7dc f2fs_write_data_pages+0x7d0/0xd0c do_writepages+0xe0/0x2f4 __writeback_single_inode+0x44/0x4ac writeback_sb_inodes+0x30c/0x538 wb_writeback+0xf4/0x440 wb_workfn+0x128/0x5d4 process_scheduled_works+0x1c4/0x45c worker_thread+0x32c/0x3e8 kthread+0x11c/0x1b0 ret_from_fork+0x10/0x20 Kernel panic - not syncing: kernel: panic_on_warn set ...
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb , < 8df2eedd371a1c24ecc4283581299d7737dfcd06 (git)
Affected: bcacb52a985f1b6d280f698a470b873dfe52728a , < f846eacde280ecc3daedfe001580e3033565179e (git)
Affected: 8ea87e34792258825d290f4dc5216276e91cb224 , < f12039df1515d5daf7d92e586ece5cefeb39561b (git)
Affected: ac6f420291b3fee1113f21d612fa88b628afab5b , < 8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0 (git)
Affected: ac6f420291b3fee1113f21d612fa88b628afab5b , < 72b7ceca857f38a8ca7c5629feffc63769638974 (git)
Affected: a5abba5e0e586e258ded3e798fe5f69c66fec198 (git)
Affected: 6f3821acd7c3143145999248087de5fb4b48cf26 (git)
Affected: ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb (git)
Affected: 6.1.120 , < 6.1.178 (semver)
Affected: 6.6.64 , < 6.6.114 (semver)
Affected: 6.12.4 , < 6.12.54 (semver)
Affected: 5.4.287 , < 5.5 (semver)
Affected: 5.10.231 , < 5.11 (semver)
Affected: 5.15.174 , < 5.16 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.114 , ≤ 6.6.* (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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            "affectedData": [
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.6",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "defaultStatus": "unknown",
                "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP",
                "vendor": "Siemens",
                "versions": [
                  {
                    "lessThan": "*",
                    "status": "affected",
                    "version": "V3.1.7",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: quota: create dedicated workqueue for quota_release_work\n\nThere is a kernel panic due to WARN_ONCE when panic_on_warn is set.\n\nThis issue occurs when writeback is triggered due to sync call for an\nopened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance\nis needed at sync path, flush for quota_release_work is triggered.\nBy default quota_release_work is queued to \"events_unbound\" queue which\ndoes not have WQ_MEM_RECLAIM flag. During f2fs balance \"writeback\"\nworkqueue tries to flush quota_release_work causing kernel panic due to\nMEM_RECLAIM flag mismatch errors.\n\nThis patch creates dedicated workqueue with WQ_MEM_RECLAIM flag\nfor work quota_release_work.\n\n------------[ cut here ]------------\nWARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148\nCall trace:\n check_flush_dependency+0x13c/0x148\n __flush_work+0xd0/0x398\n flush_delayed_work+0x44/0x5c\n dquot_writeback_dquots+0x54/0x318\n f2fs_do_quota_sync+0xb8/0x1a8\n f2fs_write_checkpoint+0x3cc/0x99c\n f2fs_gc+0x190/0x750\n f2fs_balance_fs+0x110/0x168\n f2fs_write_single_data_page+0x474/0x7dc\n f2fs_write_data_pages+0x7d0/0xd0c\n do_writepages+0xe0/0x2f4\n __writeback_single_inode+0x44/0x4ac\n writeback_sb_inodes+0x30c/0x538\n wb_writeback+0xf4/0x440\n wb_workfn+0x128/0x5d4\n process_scheduled_works+0x1c4/0x45c\n worker_thread+0x32c/0x3e8\n kthread+0x11c/0x1b0\n ret_from_fork+0x10/0x20\nKernel panic - not syncing: kernel: panic_on_warn set ..."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: cuota: crear cola de trabajo dedicada para quota_release_work\n\nHay un p\u00e1nico del kernel debido a WARN_ONCE cuando panic_on_warn est\u00e1 configurado.\n\nEste problema ocurre cuando se activa la escritura diferida debido a una llamada de sincronizaci\u00f3n para un archivo abierto (es decir, la raz\u00f3n de la escritura diferida es WB_REASON_SYNC). Cuando se necesita el balanceo de f2fs en la ruta de sincronizaci\u00f3n, se activa el vaciado para quota_release_work. Por defecto, quota_release_work se encola en la cola \u201cevents_unbound\u201d que no tiene la bandera WQ_MEM_RECLAIM. Durante el balanceo de f2fs, la cola de trabajo \u201cwriteback\u201d intenta vaciar quota_release_work, causando un p\u00e1nico del kernel debido a errores de falta de coincidencia de la bandera MEM_RECLAIM.\n\nEste parche crea una cola de trabajo dedicada con la bandera WQ_MEM_RECLAIM para el trabajo quota_release_work.\n\n------------[ cortar aqu\u00ed ]------------\nADVERTENCIA: CPU: 4 PID: 14867 en kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148\nRastro de llamada:\n check_flush_dependency+0x13c/0x148\n __flush_work+0xd0/0x398\n flush_delayed_work+0x44/0x5c\n dquot_writeback_dquots+0x54/0x318\n f2fs_do_quota_sync+0xb8/0x1a8\n f2fs_write_checkpoint+0x3cc/0x99c\n f2fs_gc+0x190/0x750\n f2fs_balance_fs+0x110/0x168\n f2fs_write_single_data_page+0x474/0x7dc\n f2fs_write_data_pages+0x7d0/0xd0c\n do_writepages+0xe0/0x2f4\n __writeback_single_inode+0x44/0x4ac\n writeback_sb_inodes+0x30c/0x538\n wb_writeback+0xf4/0x440\n wb_workfn+0x128/0x5d4\n process_scheduled_works+0x1c4/0x45c\n worker_thread+0x32c/0x3e8\n kthread+0x11c/0x1b0\n ret_from_fork+0x10/0x20\nP\u00e1nico del kernel - no sincronizando: kernel: panic_on_warn configurado ..."
          }
        ],
        "id": "CVE-2025-40196",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-11-12T22:15:46.673",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/72b7ceca857f38a8ca7c5629feffc63769638974"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8df2eedd371a1c24ecc4283581299d7737dfcd06"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f12039df1515d5daf7d92e586ece5cefeb39561b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f846eacde280ecc3daedfe001580e3033565179e"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-30T10:28:07+00:00",
      "cve": "CVE-2025-40196",
      "id": "CVE-2025-40196",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "184",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs: quota: create dedicated workqueue for quota_release_work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40196.json",
      "version": "3"
    }
  }
}



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