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CVE-2023-4130 (GCVE-0-2023-4130)

Vulnerability from cvelistv5 – Published: 2025-08-16 13:27 – Updated: 2026-08-15 12:23
VLAI
Title
ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea() There are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request from client. ksmbd find next smb2_ea_info using ->NextEntryOffset of current smb2_ea_info. ksmbd need to validate buffer length Before accessing the next ea. ksmbd should check buffer length using buf_len, not next variable. next is the start offset of current ea that got from previous ea.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < aeb974907642be095e38ecb1a400ca583958b2b0 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < f339d76a3a972601d0738b881b099d49ebbdc3a2 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 4bf629262f9118ee91b1c3a518ebf2b3bcb22180 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 79ed288cef201f1f212dfb934bcaac75572fb8f6 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.127 , ≤ 5.15.* (semver)
Unaffected: 6.1.46 , ≤ 6.1.* (semver)
Unaffected: 6.4.11 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()\n\nThere are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request\nfrom client. ksmbd find next smb2_ea_info using -\u003eNextEntryOffset of\ncurrent smb2_ea_info. ksmbd need to validate buffer length Before\naccessing the next ea. ksmbd should check buffer length using buf_len,\nnot next variable. next is the start offset of current ea that got from\nprevious ea."
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              "value": "AV:N - The bug is in ksmbd\u0027s in-kernel SMB server (fs/smb/server/smb2pdu.c) and is reached over TCP/445 via SMB2_SET_INFO FILE_FULL_EA_INFORMATION or SMB2_CREATE with an EA create context; a remote client triggers it with crafted EA buffers.\nAC:L - The attacker fully controls NextEntryOffset, EaNameLength, and EaValueLength in the EA list and can deterministically advance past the validated region so subsequent entries are parsed with an incorrect remaining-length check; no race or attacker-uncontrollable precondition is required.\nPR:L - smb2_set_ea() is reached only after SMB2 session setup and tree connect: SET_INFO needs a writable handle with FILE_WRITE_EA, and CREATE-with-EA needs share write access, so an ordinary authenticated SMB account (or guest on guest-enabled shares) suffices, but this is not a pre-authentication path.\nUI:N - The attacker completes negotiate, session setup, tree connect, and the crafted SET_INFO/CREATE sequence entirely from its own connection; no local user or administrator action is required.\nS:U - The out-of-bounds read, optional xattr exfiltration, and any oops occur within the host kernel/ksmbd security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - After advancing via NextEntryOffset, the wrong check validates against next instead of remaining buf_len, so EaNameLength/EaValueLength can drive unbounded out-of-bounds reads of adjacent kernel heap; setxattr can persist that memory into an EA the attacker later queries, so the over-read is not limited to a few bytes.\nI:N - The defect is a read past the request buffer into name/value parsing and setxattr source data; there is no out-of-bounds write, type confusion, or control-flow hijack primitive from this bug alone (ZDI classifies it as information disclosure).\nA:H - Reading past the kmalloc\u0027d request buffer can fault into unmapped memory and oops/panic the kernel, and the attacker can retrigger the malformed EA list on each SET_INFO or CREATE."
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    "dateReserved": "2023-08-03T08:12:08.227Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:32:32+00:00",
      "cve": "CVE-2023-4130",
      "id": "CVE-2023-4130",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-4130.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:35:49Z",
      "cve": "CVE-2023-4130",
      "id": "CVE-2023-4130",
      "initial_release_date": "2025-08-16T23:25:35Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "465",
      "product_status:recommended": "318",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-4130",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-4130.json",
      "version": "54"
    }
  }
}



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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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