CVE-2023-3866 (GCVE-0-2023-3866)

Vulnerability from cvelistv5 – Published: 2025-08-16 13:27 – Updated: 2026-08-05 09:09
VLAI
Title
ksmbd: validate session id and tree id in the compound request
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate session id and tree id in the compound request This patch validate session id and tree id in compound request. If first operation in the compound is SMB2 ECHO request, ksmbd bypass session and tree validation. So work->sess and work->tcon could be NULL. If secound request in the compound access work->sess or tcon, It cause NULL pointer dereferecing error.
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
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < eb947403518ea3d93f6d89264bb1f5416bb0c7d0 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 854156d12caa9d36de1cf5f084591c7686cc8a9d (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < d1066c1b3663401cd23c0d6e60cdae750ce00c0f (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 5005bcb4219156f1bf7587b185080ec1da08518e (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.121 , ≤ 5.15.* (semver)
Unaffected: 6.1.36 , ≤ 6.1.* (semver)
Unaffected: 6.3.10 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate session id and tree id in the compound request\n\nThis patch validate session id and tree id in compound request.\nIf first operation in the compound is SMB2 ECHO request, ksmbd bypass\nsession and tree validation. So work-\u003esess and work-\u003etcon could be NULL.\nIf secound request in the compound access work-\u003esess or tcon, It cause\nNULL pointer dereferecing error."
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              "value": "AV:N - The vulnerable code is in ksmbd (fs/smb/server/), the in-kernel SMB server reachable over TCP/445; a remote attacker triggers it by sending a crafted compound SMB2 request to a listening ksmbd instance.\nAC:L - The attacker fully controls the compound PDU layout and can reliably place SMB2_ECHO (or NEGOTIATE/SESSION_SETUP) first so session/tree validation is skipped for subsequent commands; no race or attacker-uncontrollable condition is required.\nPR:N - SMB2_ECHO/NEGOTIATE/SESSION_SETUP bypass smb2_check_user_session() without credentials, and with work-\u003esess left NULL signing checks are also skipped, so the crash path is reachable pre-authentication over the network.\nUI:N - Exploitation requires only attacker-sent SMB2 compound packets to an already-running ksmbd listener; no victim user or administrator action is needed.\nS:U - Impact is confined to the host kernel/ksmbd security authority (kernel oops/DoS on the SMB server host); this is not a VM escape, IOMMU bypass, or other cross-authority boundary change.\nC:N - The defect is a pure NULL pointer dereference (e.g. tcon-\u003eshare_conf with tcon NULL in smb2_open); it does not provide an information-disclosure or arbitrary-read primitive.\nI:N - The bug yields a NULL dereference crash rather than an out-of-bounds write, UAF, or other integrity/control-flow corruption primitive.\nA:H - Subsequent compound commands dereference NULL session/tree pointers, causing a kernel oops that an unauthenticated remote attacker can retrigger at will, denying service to ksmbd and potentially the host."
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    "dateReserved": "2023-07-24T14:52:41.881Z",
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Este parche valida el ID de sesi\u00f3n y el ID de \u00e1rbol en la solicitud compuesta. Si la primera operaci\u00f3n en la solicitud compuesta es una solicitud ECHO SMB2, ksmbd omite la validaci\u00f3n de sesi\u00f3n y \u00e1rbol. Por lo tanto, work-\u0026gt;sess y work-\u0026gt;tcon podr\u00edan ser NULL. Si la segunda solicitud en la solicitud compuesta accede a work-\u0026gt;sess o tcon, se produce un error de desreferenciaci\u00f3n de puntero NULL.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/server.c\",\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0626e6641f6b467447c81dd7678a69c66f7746cf\",\"lessThan\":\"eb947403518ea3d93f6d89264bb1f5416bb0c7d0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0626e6641f6b467447c81dd7678a69c66f7746cf\",\"lessThan\":\"854156d12caa9d36de1cf5f084591c7686cc8a9d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0626e6641f6b467447c81dd7678a69c66f7746cf\",\"lessThan\":\"d1066c1b3663401cd23c0d6e60cdae750ce00c0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0626e6641f6b467447c81dd7678a69c66f7746cf\",\"lessThan\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/server.c\",\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.121\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.36\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.10\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4\",\"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},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"5.15.121\",\"matchCriteriaId\":\"D80EAC0B-0800-4E58-A184-64A1FA7F7EB2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.36\",\"matchCriteriaId\":\"989E8FC0-FE5E-4486-9391-FE0521B2326E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.3.10\",\"matchCriteriaId\":\"9E91549C-3A35-4895-992D-EAD48CAD6C38\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"38BC6744-7D25-4C02-9966-B224CD071D30\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"76061B41-CAE9-4467-BEDE-0FFC7956F2A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"A717BA5B-D535-46A0-A329-A25FE5CEC588\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"89CC80C6-F1EE-4AC7-BD21-DB3217BADE87\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"41EACEA1-FB69-4AF2-BC52-D39489858D42\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E1C36BE-F9D8-40B6-8281-5B8F9B42322D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D6CAA59-F0EF-4E0B-8C23-EC9535008572\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5005bcb4219156f1bf7587b185080ec1da08518e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/854156d12caa9d36de1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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:32:46+00:00",
      "cve": "CVE-2023-3866",
      "id": "CVE-2023-3866",
      "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 Chained Request NULL Pointer Dereference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-3866.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-05T01:08:26Z",
      "cve": "CVE-2023-3866",
      "id": "CVE-2023-3866",
      "initial_release_date": "2023-08-02T01:56:34Z",
      "product_status:known_not_affected": "359",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-3866",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-3866.json",
      "version": "19"
    }
  }
}



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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.

Sightings

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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.