CVE-2026-31709 (GCVE-0-2026-31709)

Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-07-15 01:08
VLAI
Title
smb: client: validate the whole DACL before rewriting it in cifsacl
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incoming ACL to rebuild the chmod/chown security descriptor. The original fix only checked that the struct smb_acl header fits before reading dacl_ptr->size or dacl_ptr->num_aces. That avoids the immediate header-field OOB read, but the rewrite helpers still walk ACEs based on pdacl->num_aces with no structural validation of the incoming DACL body. A malicious server can return a truncated DACL that still contains a header, claims one or more ACEs, and then drive replace_sids_and_copy_aces() or set_chmod_dacl() past the validated extent while they compare or copy attacker-controlled ACEs. Factor the DACL structural checks into validate_dacl(), extend them to validate each ACE against the DACL bounds, and use the shared validator before the chmod/chown rebuild paths. parse_dacl() reuses the same validator so the read-side parser and write-side rewrite paths agree on what constitutes a well-formed incoming DACL.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-1288 - Improper Validation of Consistency within Input
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < b8603d9ae6c9087662b098619996bc4a8064319d (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < c2abdebf72000a64603ced84d36ccbd164f11391 (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < 8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12 (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < d92f3f0b22414e7515696a02224d0af55e3004a3 (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5 (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < b78db9bddc84136f6a0bb49e8883cf200dfb87a8 (git)
Affected: bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 , < 0a8cf165566ba55a39fd0f4de172119dd646d39a (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:6.12.0-211.20.1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:6.12.0-55.77.1.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.126.1.rt7.467.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.126.1.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.12.1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.174.1.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.174.1.rt14.459.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:5.14.0-427.129.1.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:5.14.0-570.119.1.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate the whole DACL before rewriting it in cifsacl\n\nbuild_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a\nserver-supplied dacloffset and then use the incoming ACL to rebuild the\nchmod/chown security descriptor.\n\nThe original fix only checked that the struct smb_acl header fits before\nreading dacl_ptr-\u003esize or dacl_ptr-\u003enum_aces.  That avoids the immediate\nheader-field OOB read, but the rewrite helpers still walk ACEs based on\npdacl-\u003enum_aces with no structural validation of the incoming DACL body.\n\nA malicious server can return a truncated DACL that still contains a\nheader, claims one or more ACEs, and then drive\nreplace_sids_and_copy_aces() or set_chmod_dacl() past the validated\nextent while they compare or copy attacker-controlled ACEs.\n\nFactor the DACL structural checks into validate_dacl(), extend them to\nvalidate each ACE against the DACL bounds, and use the shared validator\nbefore the chmod/chown rebuild paths.  parse_dacl() reuses the same\nvalidator so the read-side parser and write-side rewrite paths agree on\nwhat constitutes a well-formed incoming DACL."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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        "dateUpdated": "2026-06-19T11:57:57.204Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/c2abdebf72000a64603ced84d36ccbd164f11391"
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          "url": "https://git.kernel.org/stable/c/8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12"
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        {
          "url": "https://git.kernel.org/stable/c/0a8cf165566ba55a39fd0f4de172119dd646d39a"
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      "title": "smb: client: validate the whole DACL before rewriting it in cifsacl",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31709",
    "datePublished": "2026-05-01T13:56:06.522Z",
    "dateReserved": "2026-03-09T15:48:24.133Z",
    "dateUpdated": "2026-07-15T01:08:58.337Z",
    "state": "PUBLISHED"
  },
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    "epss": {
      "cve": "CVE-2026-31709",
      "date": "2026-07-14",
      "epss": "0.00259",
      "percentile": "0.17323"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-31709",
      "id": "msrc_CVE-2026-31709",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "5",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "smb: client: validate the whole DACL before rewriting it in cifsacl",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31709.json",
      "version": "8"
    },
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That avoids the immediate\\nheader-field OOB read, but the rewrite helpers still walk ACEs based on\\npdacl-\u003enum_aces with no structural validation of the incoming DACL body.\\n\\nA malicious server can return a truncated DACL that still contains a\\nheader, claims one or more ACEs, and then drive\\nreplace_sids_and_copy_aces() or set_chmod_dacl() past the validated\\nextent while they compare or copy attacker-controlled ACEs.\\n\\nFactor the DACL structural checks into validate_dacl(), extend them to\\nvalidate each ACE against the DACL bounds, and use the shared validator\\nbefore the chmod/chown rebuild paths.  parse_dacl() reuses the same\\nvalidator so the read-side parser and write-side rewrite paths agree on\\nwhat constitutes a well-formed incoming DACL.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/client/cifsacl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"b8603d9ae6c9087662b098619996bc4a8064319d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"c2abdebf72000a64603ced84d36ccbd164f11391\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"8e47d297e7cf9a6029a0d38e7b22faba7d7aaf12\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"d92f3f0b22414e7515696a02224d0af55e3004a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"ff0ca46b13b9ef6edbcd238a3b6caacfef8ba0e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"b78db9bddc84136f6a0bb49e8883cf200dfb87a8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4\",\"lessThan\":\"0a8cf165566ba55a39fd0f4de172119dd646d39a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/client/cifsacl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.86\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.2\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-06-30T04:05:40+00:00",
      "cve": "CVE-2026-31709",
      "id": "CVE-2026-31709",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:fixed": "1808",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: validate the whole DACL before rewriting it in cifsacl",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31709.json",
      "version": "3"
    }
  }
}



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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.

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  • 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.