github - ghsa-6m8x-cvmh-fpwm

GHSA-6M8X-CVMH-FPWM

Vulnerability from github – Published: 2025-04-01 18:30 – Updated: 2025-04-15 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback

Add PF_KCOMPACTD flag and current_is_kcompactd() helper to check for it so nfs_release_folio() can skip calling nfs_wb_folio() from kcompactd.

Otherwise NFS can deadlock waiting for kcompactd enduced writeback which recurses back to NFS (which triggers writeback to NFSD via NFS loopback mount on the same host, NFSD blocks waiting for XFS's call to __filemap_get_folio):

6070.550357] INFO: task kcompactd0:58 blocked for more than 4435 seconds.

{--- [58] "kcompactd0" [<0>] folio_wait_bit+0xe8/0x200 [<0>] folio_wait_writeback+0x2b/0x80 [<0>] nfs_wb_folio+0x80/0x1b0 [nfs] [<0>] nfs_release_folio+0x68/0x130 [nfs] [<0>] split_huge_page_to_list_to_order+0x362/0x840 [<0>] migrate_pages_batch+0x43d/0xb90 [<0>] migrate_pages_sync+0x9a/0x240 [<0>] migrate_pages+0x93c/0x9f0 [<0>] compact_zone+0x8e2/0x1030 [<0>] compact_node+0xdb/0x120 [<0>] kcompactd+0x121/0x2e0 [<0>] kthread+0xcf/0x100 [<0>] ret_from_fork+0x31/0x40 [<0>] ret_from_fork_asm+0x1a/0x30 ---}

[akpm@linux-foundation.org: fix build]

Severity ?

5.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-21908"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-01T16:15:21Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: fix nfs_release_folio() to not deadlock via kcompactd writeback\n\nAdd PF_KCOMPACTD flag and current_is_kcompactd() helper to check for it so\nnfs_release_folio() can skip calling nfs_wb_folio() from kcompactd.\n\nOtherwise NFS can deadlock waiting for kcompactd enduced writeback which\nrecurses back to NFS (which triggers writeback to NFSD via NFS loopback\nmount on the same host, NFSD blocks waiting for XFS\u0027s call to\n__filemap_get_folio):\n\n6070.550357] INFO: task kcompactd0:58 blocked for more than 4435 seconds.\n\n{---\n[58] \"kcompactd0\"\n[\u003c0\u003e] folio_wait_bit+0xe8/0x200\n[\u003c0\u003e] folio_wait_writeback+0x2b/0x80\n[\u003c0\u003e] nfs_wb_folio+0x80/0x1b0 [nfs]\n[\u003c0\u003e] nfs_release_folio+0x68/0x130 [nfs]\n[\u003c0\u003e] split_huge_page_to_list_to_order+0x362/0x840\n[\u003c0\u003e] migrate_pages_batch+0x43d/0xb90\n[\u003c0\u003e] migrate_pages_sync+0x9a/0x240\n[\u003c0\u003e] migrate_pages+0x93c/0x9f0\n[\u003c0\u003e] compact_zone+0x8e2/0x1030\n[\u003c0\u003e] compact_node+0xdb/0x120\n[\u003c0\u003e] kcompactd+0x121/0x2e0\n[\u003c0\u003e] kthread+0xcf/0x100\n[\u003c0\u003e] ret_from_fork+0x31/0x40\n[\u003c0\u003e] ret_from_fork_asm+0x1a/0x30\n---}\n\n[akpm@linux-foundation.org: fix build]",
  "id": "GHSA-6m8x-cvmh-fpwm",
  "modified": "2025-04-15T18:31:42Z",
  "published": "2025-04-01T18:30:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21908"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ae31c54cff745832b9bd5b32e71f3d1b607cd1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8253ff29edcb429a9a6c75710941c6a16a9a34b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab0727d6e2196682351c25c1dd112136f6991f11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce6d9c1c2b5cc785016faa11b48b6cd317eb367e"
    }
  ],
  "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-2025-21908 (GCVE-0-2025-21908)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2025-10-01 19:26

Summary

In the Linux kernel, the following vulnerability has been resolved: NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback Add PF_KCOMPACTD flag and current_is_kcompactd() helper to check for it so nfs_release_folio() can skip calling nfs_wb_folio() from kcompactd. Otherwise NFS can deadlock waiting for kcompactd enduced writeback which recurses back to NFS (which triggers writeback to NFSD via NFS loopback mount on the same host, NFSD blocks waiting for XFS's call to __filemap_get_folio): 6070.550357] INFO: task kcompactd0:58 blocked for more than 4435 seconds. {--- [58] "kcompactd0" [<0>] folio_wait_bit+0xe8/0x200 [<0>] folio_wait_writeback+0x2b/0x80 [<0>] nfs_wb_folio+0x80/0x1b0 [nfs] [<0>] nfs_release_folio+0x68/0x130 [nfs] [<0>] split_huge_page_to_list_to_order+0x362/0x840 [<0>] migrate_pages_batch+0x43d/0xb90 [<0>] migrate_pages_sync+0x9a/0x240 [<0>] migrate_pages+0x93c/0x9f0 [<0>] compact_zone+0x8e2/0x1030 [<0>] compact_node+0xdb/0x120 [<0>] kcompactd+0x121/0x2e0 [<0>] kthread+0xcf/0x100 [<0>] ret_from_fork+0x31/0x40 [<0>] ret_from_fork_asm+0x1a/0x30 ---} [akpm@linux-foundation.org: fix build]

Severity ?

5.5 (Medium)


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

CWE

CWE-667 - Improper Locking

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ab0727d6e21966823…
	https://git.kernel.org/stable/c/5ae31c54cff745832…
	https://git.kernel.org/stable/c/8253ff29edcb429a9…
	https://git.kernel.org/stable/c/ce6d9c1c2b5cc7850…

Impacted products

Vendor

Product

Version

Linux

Affected: 96780ca55e3cbf4f150fd5a833a61492c9947b5b , < ab0727d6e2196682351c25c1dd112136f6991f11 (git)
Affected: 96780ca55e3cbf4f150fd5a833a61492c9947b5b , < 5ae31c54cff745832b9bd5b32e71f3d1b607cd1e (git)
Affected: 96780ca55e3cbf4f150fd5a833a61492c9947b5b , < 8253ff29edcb429a9a6c75710941c6a16a9a34b1 (git)
Affected: 96780ca55e3cbf4f150fd5a833a61492c9947b5b , < ce6d9c1c2b5cc785016faa11b48b6cd317eb367e (git)

Linux

Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2025-21908",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:24:19.635147Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-667",
                "description": "CWE-667 Improper Locking",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T19:26:34.548Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/file.c",
            "include/linux/compaction.h",
            "include/linux/sched.h",
            "mm/compaction.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ab0727d6e2196682351c25c1dd112136f6991f11",
              "status": "affected",
              "version": "96780ca55e3cbf4f150fd5a833a61492c9947b5b",
              "versionType": "git"
            },
            {
              "lessThan": "5ae31c54cff745832b9bd5b32e71f3d1b607cd1e",
              "status": "affected",
              "version": "96780ca55e3cbf4f150fd5a833a61492c9947b5b",
              "versionType": "git"
            },
            {
              "lessThan": "8253ff29edcb429a9a6c75710941c6a16a9a34b1",
              "status": "affected",
              "version": "96780ca55e3cbf4f150fd5a833a61492c9947b5b",
              "versionType": "git"
            },
            {
              "lessThan": "ce6d9c1c2b5cc785016faa11b48b6cd317eb367e",
              "status": "affected",
              "version": "96780ca55e3cbf4f150fd5a833a61492c9947b5b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/file.c",
            "include/linux/compaction.h",
            "include/linux/sched.h",
            "mm/compaction.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.83",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.19",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.7",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14",
                  "versionStartIncluding": "6.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: fix nfs_release_folio() to not deadlock via kcompactd writeback\n\nAdd PF_KCOMPACTD flag and current_is_kcompactd() helper to check for it so\nnfs_release_folio() can skip calling nfs_wb_folio() from kcompactd.\n\nOtherwise NFS can deadlock waiting for kcompactd enduced writeback which\nrecurses back to NFS (which triggers writeback to NFSD via NFS loopback\nmount on the same host, NFSD blocks waiting for XFS\u0027s call to\n__filemap_get_folio):\n\n6070.550357] INFO: task kcompactd0:58 blocked for more than 4435 seconds.\n\n{---\n[58] \"kcompactd0\"\n[\u003c0\u003e] folio_wait_bit+0xe8/0x200\n[\u003c0\u003e] folio_wait_writeback+0x2b/0x80\n[\u003c0\u003e] nfs_wb_folio+0x80/0x1b0 [nfs]\n[\u003c0\u003e] nfs_release_folio+0x68/0x130 [nfs]\n[\u003c0\u003e] split_huge_page_to_list_to_order+0x362/0x840\n[\u003c0\u003e] migrate_pages_batch+0x43d/0xb90\n[\u003c0\u003e] migrate_pages_sync+0x9a/0x240\n[\u003c0\u003e] migrate_pages+0x93c/0x9f0\n[\u003c0\u003e] compact_zone+0x8e2/0x1030\n[\u003c0\u003e] compact_node+0xdb/0x120\n[\u003c0\u003e] kcompactd+0x121/0x2e0\n[\u003c0\u003e] kthread+0xcf/0x100\n[\u003c0\u003e] ret_from_fork+0x31/0x40\n[\u003c0\u003e] ret_from_fork_asm+0x1a/0x30\n---}\n\n[akpm@linux-foundation.org: fix build]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:24:04.110Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab0727d6e2196682351c25c1dd112136f6991f11"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ae31c54cff745832b9bd5b32e71f3d1b607cd1e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8253ff29edcb429a9a6c75710941c6a16a9a34b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce6d9c1c2b5cc785016faa11b48b6cd317eb367e"
        }
      ],
      "title": "NFS: fix nfs_release_folio() to not deadlock via kcompactd writeback",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21908",
    "datePublished": "2025-04-01T15:40:48.171Z",
    "dateReserved": "2024-12-29T08:45:45.786Z",
    "dateUpdated": "2025-10-01T19:26:34.548Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-6M8X-CVMH-FPWM

CVE-2025-21908 (GCVE-0-2025-21908)

Tags

Sightings

Nomenclature