CVE-2026-53383 (GCVE-0-2026-53383)

Vulnerability from cvelistv5 – Published: 2026-07-19 11:59 – Updated: 2026-07-20 13:39
VLAI
Title
ksmbd: reject non-VALID session in compound request branch
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: reject non-VALID session in compound request branch smb2_check_user_session() takes a shortcut for any operation that is not the first in a COMPOUND request: it reuses work->sess (the session bound by the first operation) and validates only the SessionId, then returns "valid". It never re-checks work->sess->state == SMB2_SESSION_VALID, and a SessionId of 0xFFFFFFFFFFFFFFFF (ULLONG_MAX, the MS-SMB2 related-operation value) skips even the id comparison. The standalone path (ksmbd_session_lookup_all() plus the SESSION_SETUP state machine) does enforce the VALID state; the compound branch bypasses all of it. A SESSION_SETUP carrying only an NTLM Type-1 (NtLmNegotiate) blob publishes a fresh SMB2_SESSION_IN_PROGRESS session whose sess->user is still NULL (->user is assigned later, by ntlm_authenticate()). Used as operation 1 of a COMPOUND with operation 2 = TREE_CONNECT (related, SessionId=ULLONG_MAX, \\host\IPC$), the tree-connect then runs on that IN_PROGRESS session and reaches ksmbd_ipc_tree_connect_request(), which dereferences user_name(sess->user) with sess->user == NULL (transport_ipc.c:687/701/704) -> remote NULL-pointer dereference and a kernel Oops that wedges the ksmbd worker for all clients. Reject any non-first compound operation that lands on a session which is not SMB2_SESSION_VALID, mirroring the validity the standalone lookup path enforces. SESSION_SETUP itself legitimately runs on an IN_PROGRESS session, but it is never carried as a non-first compound operation, so multi-leg authentication is unaffected by this check.
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: eb947403518ea3d93f6d89264bb1f5416bb0c7d0 , < 25ff12b82a376ff5c4583102a63d2456a6b9ebb9 (git)
Affected: 854156d12caa9d36de1cf5f084591c7686cc8a9d , < fc578523a72cb8b329d32070b95898e81613cc3f (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < d2bbbb6c55812220fee5d801c275cc267ea3cbeb (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < 8f0302fb691537d33ec8f668565257ea9d340ffe (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < 7cad3ceaf679c55bc9946685dacafce78ce6b51a (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < 06e1f05a1dbe8bbd054c0927b17fc0a61cc8bef7 (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < 5f983b864d3d473ac533b2f4f44a1bbe5dcbccf4 (git)
Affected: 5005bcb4219156f1bf7587b185080ec1da08518e , < 609ca17d869d04ba249e32cdcbf13c0b1c66f43c (git)
Affected: d1066c1b3663401cd23c0d6e60cdae750ce00c0f (git)
Affected: 5.15.121 , < 5.15.211 (semver)
Affected: 6.1.36 , < 6.1.177 (semver)
Affected: 6.3.10 , < 6.4 (semver)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.37 , ≤ 6.18.* (semver)
Unaffected: 7.0.14 , ≤ 7.0.* (semver)
Unaffected: 7.1.2 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: reject non-VALID session in compound request branch\n\nsmb2_check_user_session() takes a shortcut for any operation that is not\nthe first in a COMPOUND request: it reuses work-\u003esess (the session bound by\nthe first operation) and validates only the SessionId, then returns\n\"valid\". It never re-checks work-\u003esess-\u003estate == SMB2_SESSION_VALID, and a\nSessionId of 0xFFFFFFFFFFFFFFFF (ULLONG_MAX, the MS-SMB2 related-operation\nvalue) skips even the id comparison. The standalone path\n(ksmbd_session_lookup_all() plus the SESSION_SETUP state machine) does\nenforce the VALID state; the compound branch bypasses all of it.\n\nA SESSION_SETUP carrying only an NTLM Type-1 (NtLmNegotiate) blob publishes\na fresh SMB2_SESSION_IN_PROGRESS session whose sess-\u003euser is still NULL\n(-\u003euser is assigned later, by ntlm_authenticate()). Used as operation 1 of\na COMPOUND with operation 2 = TREE_CONNECT (related, SessionId=ULLONG_MAX,\n\\\\host\\IPC$), the tree-connect then runs on that IN_PROGRESS session and\nreaches ksmbd_ipc_tree_connect_request(), which dereferences\nuser_name(sess-\u003euser) with sess-\u003euser == NULL (transport_ipc.c:687/701/704)\n-\u003e remote NULL-pointer dereference and a kernel Oops that wedges the ksmbd\nworker for all clients.\n\nReject any non-first compound operation that lands on a session which is\nnot SMB2_SESSION_VALID, mirroring the validity the standalone lookup path\nenforces. SESSION_SETUP itself legitimately runs on an IN_PROGRESS session,\nbut it is never carried as a non-first compound operation, so multi-leg\nauthentication is unaffected by this check."
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    "dateUpdated": "2026-07-20T13:39:47.835Z",
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      "date": "2026-07-21",
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      "percentile": "0.46319"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:46:41.000Z",
      "cve": "CVE-2026-53383",
      "id": "msrc_CVE-2026-53383",
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ksmbd: reject non-VALID session in compound request branch",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53383.json",
      "version": "2"
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The standalone path\\n(ksmbd_session_lookup_all() plus the SESSION_SETUP state machine) does\\nenforce the VALID state; the compound branch bypasses all of it.\\n\\nA SESSION_SETUP carrying only an NTLM Type-1 (NtLmNegotiate) blob publishes\\na fresh SMB2_SESSION_IN_PROGRESS session whose sess-\u003euser is still NULL\\n(-\u003euser is assigned later, by ntlm_authenticate()). Used as operation 1 of\\na COMPOUND with operation 2 = TREE_CONNECT (related, SessionId=ULLONG_MAX,\\n\\\\\\\\host\\\\IPC$), the tree-connect then runs on that IN_PROGRESS session and\\nreaches ksmbd_ipc_tree_connect_request(), which dereferences\\nuser_name(sess-\u003euser) with sess-\u003euser == NULL (transport_ipc.c:687/701/704)\\n-\u003e remote NULL-pointer dereference and a kernel Oops that wedges the ksmbd\\nworker for all clients.\\n\\nReject any non-first compound operation that lands on a session which is\\nnot SMB2_SESSION_VALID, mirroring the validity the standalone lookup path\\nenforces. SESSION_SETUP itself legitimately runs on an IN_PROGRESS session,\\nbut it is never carried as a non-first compound operation, so multi-leg\\nauthentication is unaffected by this check.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"eb947403518ea3d93f6d89264bb1f5416bb0c7d0\",\"lessThan\":\"25ff12b82a376ff5c4583102a63d2456a6b9ebb9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"854156d12caa9d36de1cf5f084591c7686cc8a9d\",\"lessThan\":\"fc578523a72cb8b329d32070b95898e81613cc3f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"d2bbbb6c55812220fee5d801c275cc267ea3cbeb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"8f0302fb691537d33ec8f668565257ea9d340ffe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"7cad3ceaf679c55bc9946685dacafce78ce6b51a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"06e1f05a1dbe8bbd054c0927b17fc0a61cc8bef7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"5f983b864d3d473ac533b2f4f44a1bbe5dcbccf4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5005bcb4219156f1bf7587b185080ec1da08518e\",\"lessThan\":\"609ca17d869d04ba249e32cdcbf13c0b1c66f43c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d1066c1b3663401cd23c0d6e60cdae750ce00c0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.121\",\"lessThan\":\"5.15.211\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.36\",\"lessThan\":\"6.1.177\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.3.10\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/smb/server/smb2pdu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.37\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.14\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.2\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-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/06e1f05a1dbe8bbd054c0927b17fc0a61cc8bef7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/25ff12b82a376ff5c4583102a63d2456a6b9ebb9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f983b864d3d473ac533b2f4f44a1bbe5dcbccf4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/609ca17d869d04ba249e32cdcbf13c0b1c66f43c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7cad3ceaf679c55bc9946685dacafce78ce6b51a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8f0302fb691537d33ec8f668565257ea9d340ffe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d2bbbb6c55812220fee5d801c275cc267ea3cbeb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc578523a72cb8b329d32070b95898e81613cc3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:06:48+00:00",
      "cve": "CVE-2026-53383",
      "id": "CVE-2026-53383",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: reject non-VALID session in compound request branch",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53383.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.

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.