Vulnerability-Lookup

CVE-2026-89709 (GCVE-0-2026-89709)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-10-21 12:48

Title

lockd, nfsd: RCU-protect nlmsvc_ops dispatch

Summary

In the Linux kernel, the following vulnerability has been resolved: lockd, nfsd: RCU-protect nlmsvc_ops dispatch nlmsvc_ops is published by nfsd_lockd_init() and cleared by nfsd_lockd_shutdown() with plain stores, while lockd dereferences it unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer targets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's .text, so a stale load after rmmod nfsd results in either a NULL deref or a module-text use-after-free. Declare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear via RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module *owner field to nlmsvc_binding and pin the module across indirect calls with try_module_get/module_put. When the binding is torn down, fall back to fput() to avoid leaking struct file references.

Severity

8.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 19:26 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

5 references

URL	Tags
https://git.kernel.org/stable/c/43943532c105ea8fe…
https://git.kernel.org/stable/c/6e7495972039f212e…
https://git.kernel.org/stable/c/836ce2b99bcce6d68…
https://git.kernel.org/stable/c/3c461a1820088fb58…
https://git.kernel.org/stable/c/641e5e20852359b8c…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 43943532c105ea8fe26039a1347cfda4ac0fcadc (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6e7495972039f212e336e552b58cac9dd54611c3 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 836ce2b99bcce6d68c58edd04efbc5cd1fd581af (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3c461a1820088fb5889d73a6522369bde45527a9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 641e5e20852359b8c31149be4598884e30652f60 (git)	guessed
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.114 , ≤ 6.12.* (semver) Unaffected: 6.18.57 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)	guessed

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                "id": "CVE-2026-89709",
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                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:26:23.054440Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T19:26:24.223Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/lockd/svc.c",
                "fs/lockd/svc4proc.c",
                "fs/lockd/svcproc.c",
                "fs/lockd/svcsubs.c",
                "fs/nfsd/lockd.c",
                "include/linux/lockd/bind.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "43943532c105ea8fe26039a1347cfda4ac0fcadc",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
                  "lessThan": "6e7495972039f212e336e552b58cac9dd54611c3",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
                  "lessThan": "836ce2b99bcce6d68c58edd04efbc5cd1fd581af",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
                  "lessThan": "3c461a1820088fb5889d73a6522369bde45527a9",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                },
                {
                  "lessThan": "641e5e20852359b8c31149be4598884e30652f60",
                  "status": "affected",
                  "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/lockd/svc.c",
                "fs/lockd/svc4proc.c",
                "fs/lockd/svcproc.c",
                "fs/lockd/svcsubs.c",
                "fs/nfsd/lockd.c",
                "include/linux/lockd/bind.h"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.12"
                },
                {
                  "lessThan": "2.6.12",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.160",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.114",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.57",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.2.*",
                  "status": "unaffected",
                  "version": "7.2.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.160",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.114",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.57",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2.4",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.3",
                      "versionStartIncluding": "2.6.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferences\nit unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer\ntargets nfsd\u0027s .rodata and the fopen/fclose callbacks live in nfsd\u0027s\n.text, so a stale load after rmmod nfsd results in either a NULL\nderef or a module-text use-after-free.\n\nDeclare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear\nvia RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module\n*owner field to nlmsvc_binding and pin the module across indirect\ncalls with try_module_get/module_put. When the binding is torn down,\nfall back to fput() to avoid leaking struct file references."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.1,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - lockd is the in-kernel NLM RPC server on TCP/UDP (rpcbind-registered) used with nfsd. nlm_do_fopen() and nlm_delete_file() run from NLM LOCK/TEST/UNLOCK/FREE_ALL in svc_recv, so a remote NFS/NLM peer reaches the unguarded nlmsvc_ops-\u003efopen/fclose dispatch.\nAC:H - The UAF requires exit_nfsd()/rmmod nfsd to NULL nlmsvc_ops with a plain store and free nfsd .text while lockd still dispatches. A remote attacker can flood NLM requests but cannot unload nfsd; that victim-side module teardown is beyond attacker control.\nPR:N - lockd_authenticate() accepts RPC_AUTH_NULL and RPC_AUTH_UNIX before procedure dispatch. nlm_fopen() uses NFSD_MAY_BYPASS_GSS|NFSD_MAY_NLM, and typical exports use AUTH_SYS, so no host account or capability is required.\nUI:N - Exploitation is driven by attacker-sent NLM RPCs to an already-running lockd; no victim user must mount a filesystem or open a file. nfsd unload is an environmental timing condition, not User Interaction.\nS:U - The module-text UAF and NULL deref corrupt host kernel lockd/nfsd state within the same OS security authority and do not cross a VM, IOMMU, or sandbox boundary.\nC:H - After rmmod, a stale nlmsvc_ops load calls fopen/fclose from freed nfsd .rodata/.text. Reclaim of those module pages lets the attacker control the indirect-call target, yielding an arbitrary kernel read per UAF guidance.\nI:H - Indirect call through a dangling nlmsvc_binding in freed nfsd module memory is a RIP-hijack primitive; spraying recycled module pages enables arbitrary kernel write and control-flow hijack, so integrity impact is high.\nA:H - A stale nlmsvc_ops load after rmmod nfsd is either a NULL deref or a call into unmapped module text; both oops/panic the kernel, so availability impact is high."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-21T12:48:25.611Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc"
            },
            {
              "url": "https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3"
            },
            {
              "url": "https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af"
            },
            {
              "url": "https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9"
            },
            {
              "url": "https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60"
            }
          ],
          "title": "lockd, nfsd: RCU-protect nlmsvc_ops dispatch",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-89709",
        "datePublished": "2026-09-11T19:46:24.803Z",
        "dateReserved": "2026-09-11T19:38:34.751Z",
        "dateUpdated": "2026-10-21T12:48:25.611Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

BELL-CVE-2026-89709 (CVE-2026-89709)

Vulnerability from osv_bellsoft – Published: 2026-09-15 06:05 – Updated: 2026-10-23 20:02 – Source website

Severity

8.1 (High)


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

References

URL

Type

https://docs.bell-sw.com/security/cves/CVE-2026-89709

ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Alpaquita:23",
        "name": "linux-lts",
        "purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=23"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.182-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:25",
        "name": "linux-lts",
        "purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.12.103-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:stream",
        "name": "linux-lts",
        "purl": "pkg:apk/alpaquita/linux-lts?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.55-r0"
            },
            {
              "fixed": "6.18.58-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "id": "BELL-CVE-2026-89709",
  "modified": "2026-10-23T20:02:29.963258Z",
  "published": "2026-09-15T06:05:50.82020Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://docs.bell-sw.com/security/cves/CVE-2026-89709"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-89709"
  ]
}

FKIE_CVE-2026-89709

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-10-21 13:20

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/lockd/svc.c",
            "fs/lockd/svc4proc.c",
            "fs/lockd/svcproc.c",
            "fs/lockd/svcsubs.c",
            "fs/nfsd/lockd.c",
            "include/linux/lockd/bind.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "43943532c105ea8fe26039a1347cfda4ac0fcadc",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "6e7495972039f212e336e552b58cac9dd54611c3",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "836ce2b99bcce6d68c58edd04efbc5cd1fd581af",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "3c461a1820088fb5889d73a6522369bde45527a9",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "641e5e20852359b8c31149be4598884e30652f60",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/lockd/svc.c",
            "fs/lockd/svc4proc.c",
            "fs/lockd/svcproc.c",
            "fs/lockd/svcsubs.c",
            "fs/nfsd/lockd.c",
            "include/linux/lockd/bind.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferences\nit unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer\ntargets nfsd\u0027s .rodata and the fopen/fclose callbacks live in nfsd\u0027s\n.text, so a stale load after rmmod nfsd results in either a NULL\nderef or a module-text use-after-free.\n\nDeclare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear\nvia RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module\n*owner field to nlmsvc_binding and pin the module across indirect\ncalls with try_module_get/module_put. When the binding is torn down,\nfall back to fput() to avoid leaking struct file references."
    }
  ],
  "id": "CVE-2026-89709",
  "lastModified": "2026-10-21T13:20:21.923",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-89709",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:26:23.054440Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-11T20:19:58.270",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-G58F-8H46-HJGV

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-10-21 15:41

Details

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

lockd, nfsd: RCU-protect nlmsvc_ops dispatch

nlmsvc_ops is published by nfsd_lockd_init() and cleared by nfsd_lockd_shutdown() with plain stores, while lockd dereferences it unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer targets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's .text, so a stale load after rmmod nfsd results in either a NULL deref or a module-text use-after-free.

Declare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear via RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module *owner field to nlmsvc_binding and pin the module across indirect calls with try_module_get/module_put. When the binding is torn down, fall back to fput() to avoid leaking struct file references.

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89709"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:58Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlockd, nfsd: RCU-protect nlmsvc_ops dispatch\n\nnlmsvc_ops is published by nfsd_lockd_init() and cleared by\nnfsd_lockd_shutdown() with plain stores, while lockd dereferences\nit unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer\ntargets nfsd\u0027s .rodata and the fopen/fclose callbacks live in nfsd\u0027s\n.text, so a stale load after rmmod nfsd results in either a NULL\nderef or a module-text use-after-free.\n\nDeclare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear\nvia RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module\n*owner field to nlmsvc_binding and pin the module across indirect\ncalls with try_module_get/module_put. When the binding is torn down,\nfall back to fput() to avoid leaking struct file references.",
  "id": "GHSA-g58f-8h46-hjgv",
  "modified": "2026-10-21T15:41:11Z",
  "published": "2026-09-11T21:31:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/43943532c105ea8fe26039a1347cfda4ac0fcadc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e7495972039f212e336e552b58cac9dd54611c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-89709

Vulnerability from csaf_microsoft - Published: 2026-09-13 01:11 - Updated: 2026-10-22 01:09

Summary

lockd, nfsd: RCU-protect nlmsvc_ops dispatch

Scope

1 vulnerability in this advisory, including CVE-2026-89709.

CVE-2026-89709

Known affected: 3 products Under investigation: 1 product

Open the full advisory

OPENSUSE-SU-2026:11880-1

Vulnerability from csaf_opensuse - Published: 2026-09-24 00:00 - Updated: 2026-10-22 10:43

Summary

kernel-devel-7.2.7-1.1 on GA media

Severity

Moderate

Scope

904 vulnerabilities in this advisory, including CVE-2026-89709.

CVE-2026-89709

4.1 (Medium)


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

Recommended: 16 products

Open the full advisory

UBUNTU-CVE-2026-89709 (CVE-2026-89709)

Vulnerability from osv_ubuntu – Published: 2026-09-11 20:19 – Updated: 2026-10-19 08:04 – Source website

Details

Severity

8.1 (High)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-89709	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-89709	REPORT
	https://git.kernel.org/linus/641e5e20852359b8c311…	REPORT
	https://git.kernel.org/stable/c/3c461a1820088fb58…	REPORT
	https://git.kernel.org/stable/c/641e5e20852359b8c…	REPORT

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WID-SEC-W-2026-3321

Vulnerability from csaf_certbund - Published: 2026-09-13 22:00 - Updated: 2026-10-08 22:00

Summary

Linux Kernel: Mehrere Schwachstellen

Severity

Hoch

Scope

431 vulnerabilities in this advisory, including CVE-2026-89709.

CVE-2026-89709

Known affected: 8 products

Open the full advisory

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.

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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.

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CVE-2026-89709 (GCVE-0-2026-89709)

BELL-CVE-2026-89709 (CVE-2026-89709)

FKIE_CVE-2026-89709

GHSA-G58F-8H46-HJGV

MSRC_CVE-2026-89709

OPENSUSE-SU-2026:11880-1

UBUNTU-CVE-2026-89709 (CVE-2026-89709)

WID-SEC-W-2026-3321

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