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CVE-2026-89696 (GCVE-0-2026-89696)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
nfsd: block non-SAVEFH ops after FOREIGN PUTFH to prevent NULL deref
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: block non-SAVEFH ops after FOREIGN PUTFH to prevent NULL deref When CONFIG_NFSD_V4_2_INTER_SSC is enabled, nfsd4_putfh() can return success with fh_dentry and fh_export both NULL if fh_verify() returns nfserr_stale and putfh->no_verify is true. The NFSD4_FH_FOREIGN flag is set, but the compound dispatch loop only uses this flag to bypass the nfserr_nofilehandle check -- it does not prevent subsequent ops from running with a NULL fh_dentry. A remote client can exploit this by crafting a COMPOUND that includes an inter-SSC COPY (which causes check_if_stalefh_allowed() to set no_verify=true on the saved PUTFH) with an additional op inserted between the source PUTFH and SAVEFH. For example, SETATTR calls fh_want_write() which dereferences fh_export->ex_path.mnt without calling fh_verify() first, causing a NULL pointer dereference in the nfsd kthread. Fix this by gating the dispatch loop: when NFSD4_FH_FOREIGN is set and fh_dentry is NULL, only OP_SAVEFH (needed for the inter-SSC flow) and ops with ALLOWED_WITHOUT_FH (which don't need a resolved filehandle) may proceed. All other ops receive nfserr_stale, per RFC 7862 Section 15.2.3 which specifies that foreign filehandle validation is deferred to the consuming operation and NFS4ERR_STALE returned at that point.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < ffdc844e673d2bcb2af8c8c3eef8cdea59d0bf32 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < 00c84f4eec715e501efc080a5670114189e42507 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < 2d9846fd1c767920fddd4bde30eb35cd2969df13 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < 977e6f006a7a3ffc4216ae6034f768f8de6fd138 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < 35f248bd40b47b229d4999581df45b97daadd977 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < 311f7d926630940650447cbd1c932b076b40a6c4 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < bf4d338dc8625d70c7f2cb0657d66851a7ac9154 (git)
Affected: b9e8638e3d9ed8334f1f7071e081860aac37e83e , < c59738a00aa51b16adc1b5ceb7c80877168efb4d (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (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)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: block non-SAVEFH ops after FOREIGN PUTFH to prevent NULL deref\n\nWhen CONFIG_NFSD_V4_2_INTER_SSC is enabled, nfsd4_putfh() can return\nsuccess with fh_dentry and fh_export both NULL if fh_verify() returns\nnfserr_stale and putfh-\u003eno_verify is true. The NFSD4_FH_FOREIGN flag\nis set, but the compound dispatch loop only uses this flag to bypass\nthe nfserr_nofilehandle check -- it does not prevent subsequent ops\nfrom running with a NULL fh_dentry.\n\nA remote client can exploit this by crafting a COMPOUND that includes\nan inter-SSC COPY (which causes check_if_stalefh_allowed() to set\nno_verify=true on the saved PUTFH) with an additional op inserted\nbetween the source PUTFH and SAVEFH. For example, SETATTR calls\nfh_want_write() which dereferences fh_export-\u003eex_path.mnt without\ncalling fh_verify() first, causing a NULL pointer dereference in the\nnfsd kthread.\n\nFix this by gating the dispatch loop: when NFSD4_FH_FOREIGN is set\nand fh_dentry is NULL, only OP_SAVEFH (needed for the inter-SSC flow)\nand ops with ALLOWED_WITHOUT_FH (which don\u0027t need a resolved\nfilehandle) may proceed. All other ops receive nfserr_stale, per\nRFC 7862 Section 15.2.3 which specifies that foreign filehandle\nvalidation is deferred to the consuming operation and NFS4ERR_STALE\nreturned at that point."
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              "value": "AV:N - The bug is in nfsd NFSv4 COMPOUND dispatch and is triggered by a crafted NFSv4.2 COMPOUND over TCP/2049 (PUTFH of a stale fh, then SETATTR, with an inter-SSC COPY in the same compound). No local access is required.\nAC:L - After EXCHANGE_ID/CREATE_SESSION, the attacker fully controls the compound that marks the source PUTFH no_verify and inserts SETATTR before SAVEFH, so fh_want_write hits NULL fh_export deterministically with no race or layout dependency.\nPR:N - AUTH_SYS (the usual nfsd configuration) verifies no secret; a client just asserts a UID to create a session. SETATTR then runs on the FOREIGN fh without fh_verify, so no export access check or other credential gate is reached.\nUI:N - The attacker sends the COMPOUND directly to nfsd; no administrator or victim user action is required at exploitation time.\nS:U - The NULL dereference oopses the nfsd kthread in the host kernel\u0027s own authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:N - After the stale FOREIGN PUTFH, fh_export and fh_dentry are NULL rather than dangling or attacker-controlled, so the fault is on the first load of fh_export-\u003eex_path.mnt with no disclosure.\nI:N - This is a pure NULL pointer dereference in fh_want_write with no write to attacker-influenced memory and no control-flow hijack primitive.\nA:H - The NULL dereference oopses the nfsd kthread and can be replayed to exhaust nfsd threads, denying NFS service; with panic_on_oops it panics the host."
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The NFSD4_FH_FOREIGN flag\\nis set, but the compound dispatch loop only uses this flag to bypass\\nthe nfserr_nofilehandle check -- it does not prevent subsequent ops\\nfrom running with a NULL fh_dentry.\\n\\nA remote client can exploit this by crafting a COMPOUND that includes\\nan inter-SSC COPY (which causes check_if_stalefh_allowed() to set\\nno_verify=true on the saved PUTFH) with an additional op inserted\\nbetween the source PUTFH and SAVEFH. For example, SETATTR calls\\nfh_want_write() which dereferences fh_export-\u003eex_path.mnt without\\ncalling fh_verify() first, causing a NULL pointer dereference in the\\nnfsd kthread.\\n\\nFix this by gating the dispatch loop: when NFSD4_FH_FOREIGN is set\\nand fh_dentry is NULL, only OP_SAVEFH (needed for the inter-SSC flow)\\nand ops with ALLOWED_WITHOUT_FH (which don\u0027t need a resolved\\nfilehandle) may proceed. All other ops receive nfserr_stale, per\\nRFC 7862 Section 15.2.3 which specifies that foreign filehandle\\nvalidation is deferred to the consuming operation and NFS4ERR_STALE\\nreturned at that point.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"ffdc844e673d2bcb2af8c8c3eef8cdea59d0bf32\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"00c84f4eec715e501efc080a5670114189e42507\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"2d9846fd1c767920fddd4bde30eb35cd2969df13\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"977e6f006a7a3ffc4216ae6034f768f8de6fd138\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"35f248bd40b47b229d4999581df45b97daadd977\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"311f7d926630940650447cbd1c932b076b40a6c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"bf4d338dc8625d70c7f2cb0657d66851a7ac9154\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b9e8638e3d9ed8334f1f7071e081860aac37e83e\",\"lessThan\":\"c59738a00aa51b16adc1b5ceb7c80877168efb4d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4proc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00c84f4eec715e501efc080a5670114189e42507\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d9846fd1c767920fddd4bde30eb35cd2969df13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/311f7d926630940650447cbd1c932b076b40a6c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/35f248bd40b47b229d4999581df45b97daadd977\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/977e6f006a7a3ffc4216ae6034f768f8de6fd138\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf4d338dc8625d70c7f2cb0657d66851a7ac9154\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c59738a00aa51b16adc1b5ceb7c80877168efb4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ffdc844e673d2bcb2af8c8c3eef8cdea59d0bf32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:52:12+00:00",
      "cve": "CVE-2026-89696",
      "id": "CVE-2026-89696",
      "initial_release_date": "2026-09-11T19:46:15.030000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel (nfsd): Denial of Service via crafted NFS COMPOUND requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89696.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:00:00Z",
      "cve": "CVE-2026-89696",
      "id": "CVE-2026-89696",
      "initial_release_date": "2026-09-12T16:23:33Z",
      "product_status:known_affected": "210",
      "product_status:known_not_affected": "143",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89696",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89696.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.