Vulnerability-Lookup

FKIE_CVE-2026-89711

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: NFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check The header for commit e75b23f9e323 ("nfsd: check d_can_lookup in fh_verify of directories") details the assumption that justified adding the WARN_ON_ONCE to nfsd_mode_check(), that assumption is invalid (in the case of NFS reexport). When NFSD exports an NFS filesystem it is very possible for nfsd_mode_check() to encounter a @dentry that doesn't have i_op->lookup (see nfs_fhget()'s NFS_ATTR_FATTR_MOUNTPOINT and NFS_ATTR_FATTR_V4_REFERRAL handling, and d_flags_for_inode()). So remove nfsd_mode_check()'s WARN_ON_ONCE(). The nfserr_notdir return on that branch must stay. It guards the subsequent lookup_one_unlocked() -> __lookup_slow() path, which calls inode->i_op->lookup() with no NULL check, so returning nfserr_notdir is what keeps a client LOOKUP into such a @dentry from dereferencing a NULL method pointer.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2ef131323999539038e306773c8256403834361b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ef182a8fe9c12b0d936880b1e504840639aa009
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9f4434893a2783f7384d993cea883aff3fb7a52d
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a275de3bac5635514ca830f2e46b5ff0e66b5c4c
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ae251937c6f0237e5b555a5e4ba4595b8206e865
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b55b4d880bb080fa10eb08ba21a5d8679b8102fe
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e145e8d67a5d41c72d322e7f87ab474d39d9dfb7

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsfh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae251937c6f0237e5b555a5e4ba4595b8206e865",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "e145e8d67a5d41c72d322e7f87ab474d39d9dfb7",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "9f4434893a2783f7384d993cea883aff3fb7a52d",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "2ef131323999539038e306773c8256403834361b",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "b55b4d880bb080fa10eb08ba21a5d8679b8102fe",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "7ef182a8fe9c12b0d936880b1e504840639aa009",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "a275de3bac5635514ca830f2e46b5ff0e66b5c4c",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsfh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nNFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check\n\nThe header for commit e75b23f9e323 (\"nfsd: check d_can_lookup in\nfh_verify of directories\") details the assumption that justified\nadding the WARN_ON_ONCE to nfsd_mode_check(), that assumption is\ninvalid (in the case of NFS reexport).\n\nWhen NFSD exports an NFS filesystem it is very possible for\nnfsd_mode_check() to encounter a @dentry that doesn\u0027t have\ni_op-\u003elookup (see nfs_fhget()\u0027s NFS_ATTR_FATTR_MOUNTPOINT and\nNFS_ATTR_FATTR_V4_REFERRAL handling, and d_flags_for_inode()).\n\nSo remove nfsd_mode_check()\u0027s WARN_ON_ONCE(). The nfserr_notdir\nreturn on that branch must stay. It guards the subsequent\nlookup_one_unlocked() -\u003e __lookup_slow() path, which calls\ninode-\u003ei_op-\u003elookup() with no NULL check, so returning nfserr_notdir\nis what keeps a client LOOKUP into such a @dentry from dereferencing\na NULL method pointer."
    }
  ],
  "id": "CVE-2026-89711",
  "lastModified": "2026-09-14T13:19:20.930",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:19:58.500",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ef131323999539038e306773c8256403834361b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ef182a8fe9c12b0d936880b1e504840639aa009"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f4434893a2783f7384d993cea883aff3fb7a52d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a275de3bac5635514ca830f2e46b5ff0e66b5c4c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae251937c6f0237e5b555a5e4ba4595b8206e865"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b55b4d880bb080fa10eb08ba21a5d8679b8102fe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e145e8d67a5d41c72d322e7f87ab474d39d9dfb7"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-89711 (GCVE-0-2026-89711)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02

Title

NFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check

Summary

Severity

8.2 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ae251937c6f0237e5…
https://git.kernel.org/stable/c/e145e8d67a5d41c72…
https://git.kernel.org/stable/c/9f4434893a2783f73…
https://git.kernel.org/stable/c/2ef13132399953903…
https://git.kernel.org/stable/c/b55b4d880bb080fa1…
https://git.kernel.org/stable/c/7ef182a8fe9c12b0d…
https://git.kernel.org/stable/c/a275de3bac5635514…
https://git.kernel.org/stable/c/aa0cf48a448c5a9fe…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < ae251937c6f0237e5b555a5e4ba4595b8206e865 (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < e145e8d67a5d41c72d322e7f87ab474d39d9dfb7 (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < 9f4434893a2783f7384d993cea883aff3fb7a52d (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < 2ef131323999539038e306773c8256403834361b (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < b55b4d880bb080fa10eb08ba21a5d8679b8102fe (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < 7ef182a8fe9c12b0d936880b1e504840639aa009 (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < a275de3bac5635514ca830f2e46b5ff0e66b5c4c (git) Affected: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c , < aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e (git)
Linux	Linux	Affected: 4.8 Unaffected: 0 , < 4.8 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsfh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae251937c6f0237e5b555a5e4ba4595b8206e865",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "e145e8d67a5d41c72d322e7f87ab474d39d9dfb7",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "9f4434893a2783f7384d993cea883aff3fb7a52d",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "2ef131323999539038e306773c8256403834361b",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "b55b4d880bb080fa10eb08ba21a5d8679b8102fe",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "7ef182a8fe9c12b0d936880b1e504840639aa009",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "a275de3bac5635514ca830f2e46b5ff0e66b5c4c",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            },
            {
              "lessThan": "aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e",
              "status": "affected",
              "version": "e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/nfsfh.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check\n\nThe header for commit e75b23f9e323 (\"nfsd: check d_can_lookup in\nfh_verify of directories\") details the assumption that justified\nadding the WARN_ON_ONCE to nfsd_mode_check(), that assumption is\ninvalid (in the case of NFS reexport).\n\nWhen NFSD exports an NFS filesystem it is very possible for\nnfsd_mode_check() to encounter a @dentry that doesn\u0027t have\ni_op-\u003elookup (see nfs_fhget()\u0027s NFS_ATTR_FATTR_MOUNTPOINT and\nNFS_ATTR_FATTR_V4_REFERRAL handling, and d_flags_for_inode()).\n\nSo remove nfsd_mode_check()\u0027s WARN_ON_ONCE(). The nfserr_notdir\nreturn on that branch must stay. It guards the subsequent\nlookup_one_unlocked() -\u003e __lookup_slow() path, which calls\ninode-\u003ei_op-\u003elookup() with no NULL check, so returning nfserr_notdir\nis what keeps a client LOOKUP into such a @dentry from dereferencing\na NULL method pointer."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - nfsd is the in-kernel NFS server. A remote client reaches nfsd_mode_check() via directory ops (LOOKUP, CREATE, OPEN) over TCP/UDP 2049: svc_recv to nfsd_dispatch to fh_verify to __fh_verify.\nAC:L - On an nfsd host that reexports NFS, mountpoint and NFSv4 referral dentries lack i_op-\u003elookup so d_can_lookup() is false. A client LOOKUP or other S_IFDIR fh_verify on that filehandle hits WARN_ON_ONCE deterministically with no race.\nPR:N - nfsd_mode_check() runs in __fh_verify() after filehandle decode but before check_security_flavor() and nfsd_permission(). Typical nfsd deployments accept AUTH_SYS/AUTH_NULL, so an unauthenticated peer that can reach the export triggers it with self-asserted credentials.\nUI:N - The attacker sends the NFS RPCs (NFSv4 PUTFH plus LOOKUP, or NFSv3 LOOKUP) themselves. No victim user must mount a filesystem, open a file, or otherwise interact.\nS:U - The WARN_ON_ONCE splat and any panic_on_warn crash remain inside the NFS server kernel. This is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:L - WARN_ON_ONCE calls __warn()/dump_stack(), disclosing kernel text addresses in dmesg. There is no use-after-free or out-of-bounds read; the path returns nfserr_notdir without copying kernel memory to the client.\nI:N - The fix only removes the warning. The existing nfserr_notdir return already blocks lookup_one_unlocked() from calling a NULL i_op-\u003elookup, so there is no memory corruption, write primitive, or control-flow hijack.\nA:H - WARN_ON_ONCE taints the kernel and panics the host when panic_on_warn is enabled or warn_limit is exceeded, so a remote NFS client can deny service by operating on a reexported mountpoint or referral directory."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:02:10.683Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae251937c6f0237e5b555a5e4ba4595b8206e865"
        },
        {
          "url": "https://git.kernel.org/stable/c/e145e8d67a5d41c72d322e7f87ab474d39d9dfb7"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f4434893a2783f7384d993cea883aff3fb7a52d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ef131323999539038e306773c8256403834361b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b55b4d880bb080fa10eb08ba21a5d8679b8102fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ef182a8fe9c12b0d936880b1e504840639aa009"
        },
        {
          "url": "https://git.kernel.org/stable/c/a275de3bac5635514ca830f2e46b5ff0e66b5c4c"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e"
        }
      ],
      "title": "NFSD: remove flawed WARN_ON_ONCE from nfsd_mode_check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89711",
    "datePublished": "2026-09-11T19:46:26.269Z",
    "dateReserved": "2026-09-11T19:38:34.751Z",
    "dateUpdated": "2026-09-14T12:02:10.683Z",
    "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.