CVE-2026-23050 (GCVE-0-2026-23050)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:04 – Updated: 2026-02-09 08:37
VLAI?
Title
pNFS: Fix a deadlock when returning a delegation during open()
Summary
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix a deadlock when returning a delegation during open() Ben Coddington reports seeing a hang in the following stack trace: 0 [ffffd0b50e1774e0] __schedule at ffffffff9ca05415 1 [ffffd0b50e177548] schedule at ffffffff9ca05717 2 [ffffd0b50e177558] bit_wait at ffffffff9ca061e1 3 [ffffd0b50e177568] __wait_on_bit at ffffffff9ca05cfb 4 [ffffd0b50e1775c8] out_of_line_wait_on_bit at ffffffff9ca05ea5 5 [ffffd0b50e177618] pnfs_roc at ffffffffc154207b [nfsv4] 6 [ffffd0b50e1776b8] _nfs4_proc_delegreturn at ffffffffc1506586 [nfsv4] 7 [ffffd0b50e177788] nfs4_proc_delegreturn at ffffffffc1507480 [nfsv4] 8 [ffffd0b50e1777f8] nfs_do_return_delegation at ffffffffc1523e41 [nfsv4] 9 [ffffd0b50e177838] nfs_inode_set_delegation at ffffffffc1524a75 [nfsv4] 10 [ffffd0b50e177888] nfs4_process_delegation at ffffffffc14f41dd [nfsv4] 11 [ffffd0b50e1778a0] _nfs4_opendata_to_nfs4_state at ffffffffc1503edf [nfsv4] 12 [ffffd0b50e1778c0] _nfs4_open_and_get_state at ffffffffc1504e56 [nfsv4] 13 [ffffd0b50e177978] _nfs4_do_open at ffffffffc15051b8 [nfsv4] 14 [ffffd0b50e1779f8] nfs4_do_open at ffffffffc150559c [nfsv4] 15 [ffffd0b50e177a80] nfs4_atomic_open at ffffffffc15057fb [nfsv4] 16 [ffffd0b50e177ad0] nfs4_file_open at ffffffffc15219be [nfsv4] 17 [ffffd0b50e177b78] do_dentry_open at ffffffff9c09e6ea 18 [ffffd0b50e177ba8] vfs_open at ffffffff9c0a082e 19 [ffffd0b50e177bd0] dentry_open at ffffffff9c0a0935 The issue is that the delegreturn is being asked to wait for a layout return that cannot complete because a state recovery was initiated. The state recovery cannot complete until the open() finishes processing the delegations it was given. The solution is to propagate the existing flags that indicate a non-blocking call to the function pnfs_roc(), so that it knows not to wait in this situation.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 29ade5db12930ec60133f6a02791f4b1a4af2943 , < a316fd9d3065b753b03d802530004aea481512cc (git)
Affected: 29ade5db12930ec60133f6a02791f4b1a4af2943 , < d6c75aa9d607044d1e5c8498eff0259eed356c32 (git)
Affected: 29ade5db12930ec60133f6a02791f4b1a4af2943 , < 857bf9056291a16785ae3be1d291026b2437fc48 (git)
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    Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 6.12.67 , ≤ 6.12.* (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/nfs4proc.c",
            "fs/nfs/pnfs.c",
            "fs/nfs/pnfs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a316fd9d3065b753b03d802530004aea481512cc",
              "status": "affected",
              "version": "29ade5db12930ec60133f6a02791f4b1a4af2943",
              "versionType": "git"
            },
            {
              "lessThan": "d6c75aa9d607044d1e5c8498eff0259eed356c32",
              "status": "affected",
              "version": "29ade5db12930ec60133f6a02791f4b1a4af2943",
              "versionType": "git"
            },
            {
              "lessThan": "857bf9056291a16785ae3be1d291026b2437fc48",
              "status": "affected",
              "version": "29ade5db12930ec60133f6a02791f4b1a4af2943",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/nfs4proc.c",
            "fs/nfs/pnfs.c",
            "fs/nfs/pnfs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.67",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.67",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.7",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npNFS: Fix a deadlock when returning a delegation during open()\n\nBen Coddington reports seeing a hang in the following stack trace:\n  0 [ffffd0b50e1774e0] __schedule at ffffffff9ca05415\n  1 [ffffd0b50e177548] schedule at ffffffff9ca05717\n  2 [ffffd0b50e177558] bit_wait at ffffffff9ca061e1\n  3 [ffffd0b50e177568] __wait_on_bit at ffffffff9ca05cfb\n  4 [ffffd0b50e1775c8] out_of_line_wait_on_bit at ffffffff9ca05ea5\n  5 [ffffd0b50e177618] pnfs_roc at ffffffffc154207b [nfsv4]\n  6 [ffffd0b50e1776b8] _nfs4_proc_delegreturn at ffffffffc1506586 [nfsv4]\n  7 [ffffd0b50e177788] nfs4_proc_delegreturn at ffffffffc1507480 [nfsv4]\n  8 [ffffd0b50e1777f8] nfs_do_return_delegation at ffffffffc1523e41 [nfsv4]\n  9 [ffffd0b50e177838] nfs_inode_set_delegation at ffffffffc1524a75 [nfsv4]\n 10 [ffffd0b50e177888] nfs4_process_delegation at ffffffffc14f41dd [nfsv4]\n 11 [ffffd0b50e1778a0] _nfs4_opendata_to_nfs4_state at ffffffffc1503edf [nfsv4]\n 12 [ffffd0b50e1778c0] _nfs4_open_and_get_state at ffffffffc1504e56 [nfsv4]\n 13 [ffffd0b50e177978] _nfs4_do_open at ffffffffc15051b8 [nfsv4]\n 14 [ffffd0b50e1779f8] nfs4_do_open at ffffffffc150559c [nfsv4]\n 15 [ffffd0b50e177a80] nfs4_atomic_open at ffffffffc15057fb [nfsv4]\n 16 [ffffd0b50e177ad0] nfs4_file_open at ffffffffc15219be [nfsv4]\n 17 [ffffd0b50e177b78] do_dentry_open at ffffffff9c09e6ea\n 18 [ffffd0b50e177ba8] vfs_open at ffffffff9c0a082e\n 19 [ffffd0b50e177bd0] dentry_open at ffffffff9c0a0935\n\nThe issue is that the delegreturn is being asked to wait for a layout\nreturn that cannot complete because a state recovery was initiated. The\nstate recovery cannot complete until the open() finishes processing the\ndelegations it was given.\n\nThe solution is to propagate the existing flags that indicate a\nnon-blocking call to the function pnfs_roc(), so that it knows not to\nwait in this situation."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:37:46.880Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a316fd9d3065b753b03d802530004aea481512cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6c75aa9d607044d1e5c8498eff0259eed356c32"
        },
        {
          "url": "https://git.kernel.org/stable/c/857bf9056291a16785ae3be1d291026b2437fc48"
        }
      ],
      "title": "pNFS: Fix a deadlock when returning a delegation during open()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23050",
    "datePublished": "2026-02-04T16:04:19.279Z",
    "dateReserved": "2026-01-13T15:37:45.950Z",
    "dateUpdated": "2026-02-09T08:37:46.880Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23050\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-04T17:16:15.663\",\"lastModified\":\"2026-02-05T14:57:20.563\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npNFS: Fix a deadlock when returning a delegation during open()\\n\\nBen Coddington reports seeing a hang in the following stack trace:\\n  0 [ffffd0b50e1774e0] __schedule at ffffffff9ca05415\\n  1 [ffffd0b50e177548] schedule at ffffffff9ca05717\\n  2 [ffffd0b50e177558] bit_wait at ffffffff9ca061e1\\n  3 [ffffd0b50e177568] __wait_on_bit at ffffffff9ca05cfb\\n  4 [ffffd0b50e1775c8] out_of_line_wait_on_bit at ffffffff9ca05ea5\\n  5 [ffffd0b50e177618] pnfs_roc at ffffffffc154207b [nfsv4]\\n  6 [ffffd0b50e1776b8] _nfs4_proc_delegreturn at ffffffffc1506586 [nfsv4]\\n  7 [ffffd0b50e177788] nfs4_proc_delegreturn at ffffffffc1507480 [nfsv4]\\n  8 [ffffd0b50e1777f8] nfs_do_return_delegation at ffffffffc1523e41 [nfsv4]\\n  9 [ffffd0b50e177838] nfs_inode_set_delegation at ffffffffc1524a75 [nfsv4]\\n 10 [ffffd0b50e177888] nfs4_process_delegation at ffffffffc14f41dd [nfsv4]\\n 11 [ffffd0b50e1778a0] _nfs4_opendata_to_nfs4_state at ffffffffc1503edf [nfsv4]\\n 12 [ffffd0b50e1778c0] _nfs4_open_and_get_state at ffffffffc1504e56 [nfsv4]\\n 13 [ffffd0b50e177978] _nfs4_do_open at ffffffffc15051b8 [nfsv4]\\n 14 [ffffd0b50e1779f8] nfs4_do_open at ffffffffc150559c [nfsv4]\\n 15 [ffffd0b50e177a80] nfs4_atomic_open at ffffffffc15057fb [nfsv4]\\n 16 [ffffd0b50e177ad0] nfs4_file_open at ffffffffc15219be [nfsv4]\\n 17 [ffffd0b50e177b78] do_dentry_open at ffffffff9c09e6ea\\n 18 [ffffd0b50e177ba8] vfs_open at ffffffff9c0a082e\\n 19 [ffffd0b50e177bd0] dentry_open at ffffffff9c0a0935\\n\\nThe issue is that the delegreturn is being asked to wait for a layout\\nreturn that cannot complete because a state recovery was initiated. The\\nstate recovery cannot complete until the open() finishes processing the\\ndelegations it was given.\\n\\nThe solution is to propagate the existing flags that indicate a\\nnon-blocking call to the function pnfs_roc(), so that it knows not to\\nwait in this situation.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/857bf9056291a16785ae3be1d291026b2437fc48\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a316fd9d3065b753b03d802530004aea481512cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6c75aa9d607044d1e5c8498eff0259eed356c32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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