CVE-2026-89711 (GCVE-0-2026-89711)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:51
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
Impacted products
Vendor Product Version
Linux Linux Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
Version: e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c
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              "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."
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    "datePublished": "2026-09-11T19:46:26.269Z",
    "dateReserved": "2026-09-11T19:38:34.751Z",
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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. 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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"ae251937c6f0237e5b555a5e4ba4595b8206e865\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"e145e8d67a5d41c72d322e7f87ab474d39d9dfb7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"9f4434893a2783f7384d993cea883aff3fb7a52d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"2ef131323999539038e306773c8256403834361b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"b55b4d880bb080fa10eb08ba21a5d8679b8102fe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"7ef182a8fe9c12b0d936880b1e504840639aa009\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"a275de3bac5635514ca830f2e46b5ff0e66b5c4c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e75b23f9e323b1e0759619c39d5a9f7a3a5d9d2c\", \"lessThan\": \"aa0cf48a448c5a9fe1a1e880899ecd589ce39e6e\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfsd/nfsfh.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfsfh.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:51:24.221Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89711\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:51:24.221Z\", \"dateReserved\": \"2026-09-11T19:38:34.751Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:46:26.269Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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