CVE-2026-72422 (GCVE-0-2026-72422)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:44
VLAI
Title
ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of conn->preauth_info in concurrent SMB2 NEGOTIATE conn->preauth_info is shared connection state (struct preauth_integrity_info, kmalloc-96) that is allocated and freed by the SMB2 NEGOTIATE handler and read by the response send path. smb2_handle_negotiate() allocates conn->preauth_info, and on a deassemble_neg_contexts() failure kfrees it and sets it to NULL. Both the allocation and the free/NULL happen under ksmbd_conn_lock(conn) (the connection srv_mutex), which is held across the whole handler body. The response send path smb3_preauth_hash_rsp(), called from the send: block of __handle_ksmbd_work(), reads conn->preauth_info and dereferences conn->preauth_info->Preauth_HashValue (via ksmbd_gen_preauth_integrity_hash()) without taking conn_lock. When a client drives two SMB2 NEGOTIATE requests on the same connection, one worker can free conn->preauth_info on the failing-negotiate path while a concurrent send-path worker is reading it, producing a slab use-after-free read (KASAN-confirmed). The send-path read tested conn->preauth_info for NULL but raced with the free that occurs between the NULL check and the dereference, so the NULL guard alone does not close the window. Serialize the NEGOTIATE-branch read in smb3_preauth_hash_rsp() under ksmbd_conn_lock(conn) and re-check conn->preauth_info inside the lock. Because the negotiate handler holds conn_lock across its kfree + NULL assignment, a reader that also takes conn_lock either runs fully before the allocation or fully after the NULL store, and can never observe the freed-but-not-yet-NULLed pointer. ksmbd_gen_preauth_integrity_hash() takes no locks itself (it only computes a SHA-512 over the buffer), so no lock-ordering inversion is introduced, and conn_lock is a sleepable mutex which is safe on this send path (it already performs network I/O).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dd4e4c811898410e6a3ae3b63207b7c542860907 , < c7bef84740d1d57848c74f6f5b996606e43ea4fe (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < d0a469122e7bf8338fec1949fb1e8e1290ed8caa (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < 7470511d085af1c7a043a60e53d52b512d5a10b1 (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < 16a1ecf39c217e3d164bd32ef2a4f650abc067fa (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < 77bb0bbfcc4e777ca653174689e5e363f8ee63d1 (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < 1c89da3baa2b1f269178afa87dc30479b8535776 (git)
Affected: aa7253c2393f6dcd6a1468b0792f6da76edad917 , < 0c054227479ed7e36ebccb3a558bc0ef698264f6 (git)
Affected: 8a8315a5960bd2b5ffc75f44fc089e57c3b17c44 (git)
Affected: ff20f1875889dbe4a67c9298e609d7c88cf6456d (git)
Affected: 5.15.61 , < 5.15.212 (semver)
Affected: 5.18.18 , < 5.19 (semver)
Affected: 5.19.2 , < 5.20 (semver)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free of conn-\u003epreauth_info in concurrent SMB2 NEGOTIATE\n\nconn-\u003epreauth_info is shared connection state (struct\npreauth_integrity_info, kmalloc-96) that is allocated and freed by the\nSMB2 NEGOTIATE handler and read by the response send path.\n\nsmb2_handle_negotiate() allocates conn-\u003epreauth_info, and on a\ndeassemble_neg_contexts() failure kfrees it and sets it to NULL. Both the\nallocation and the free/NULL happen under ksmbd_conn_lock(conn) (the\nconnection srv_mutex), which is held across the whole handler body.\n\nThe response send path smb3_preauth_hash_rsp(), called from the send:\nblock of __handle_ksmbd_work(), reads conn-\u003epreauth_info and dereferences\nconn-\u003epreauth_info-\u003ePreauth_HashValue (via\nksmbd_gen_preauth_integrity_hash()) without taking conn_lock. When a\nclient drives two SMB2 NEGOTIATE requests on the same connection, one\nworker can free conn-\u003epreauth_info on the failing-negotiate path while a\nconcurrent send-path worker is reading it, producing a slab\nuse-after-free read (KASAN-confirmed).\n\nThe send-path read tested conn-\u003epreauth_info for NULL but raced with the\nfree that occurs between the NULL check and the dereference, so the NULL\nguard alone does not close the window.\n\nSerialize the NEGOTIATE-branch read in smb3_preauth_hash_rsp() under\nksmbd_conn_lock(conn) and re-check conn-\u003epreauth_info inside the lock.\nBecause the negotiate handler holds conn_lock across its kfree + NULL\nassignment, a reader that also takes conn_lock either runs fully before\nthe allocation or fully after the NULL store, and can never observe the\nfreed-but-not-yet-NULLed pointer. ksmbd_gen_preauth_integrity_hash()\ntakes no locks itself (it only computes a SHA-512 over the buffer), so\nno lock-ordering inversion is introduced, and conn_lock is a sleepable\nmutex which is safe on this send path (it already performs network I/O)."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:N - The bug is in ksmbd\u0027s SMB2 NEGOTIATE handler reachable by any remote client over TCP port 445 without local access; exploitation requires only crafted SMB 3.1.1 negotiate packets on an established network connection.\nAC:L - The attacker controls both sides of the race by pipelining two SMB2 NEGOTIATE requests on the same connection, with one crafted to fail deassemble_neg_contexts() and free preauth_info while the other is in the response send path; KASAN-confirmed UAF with no uncontrollable timing.\nPR:N - SMB2 NEGOTIATE is processed before any authentication or session establishment; smb2_check_user_session explicitly exempts NEGOTIATE from session validation, so an unauthenticated remote attacker can reach the vulnerable code path.\nUI:N - Exploitation requires only network packets sent by the attacker to an exposed ksmbd instance; no victim user action such as mounting a share or opening a file is needed.\nS:U - Successful exploitation compromises kernel memory on the SMB server host itself; this is standard in-kernel memory corruption without crossing a VM, container, or IOMMU security boundary to a separate authority.\nC:H - KASAN-confirmed slab use-after-free read of conn-\u003epreauth_info (kmalloc-96) via Preauth_HashValue and Preauth_HashId dereference; UAF on attacker-influenced freed heap memory enables arbitrary kernel memory disclosure through heap grooming.\nI:H - The UAF corrupts kernel heap state on a network-facing pre-auth path; freed preauth_integrity_info objects can be reallocated via heap spraying to obtain arbitrary write or control-flow hijack primitives beyond the immediate hash-buffer access.\nA:H - Concurrent UAF read of freed conn-\u003epreauth_info during smb3_preauth_hash_rsp() causes kernel oops or panic (KASAN-confirmed); even without full exploitation the race reliably triggers high-severity denial of service on the server."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:02.758Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c7bef84740d1d57848c74f6f5b996606e43ea4fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0a469122e7bf8338fec1949fb1e8e1290ed8caa"
        },
        {
          "url": "https://git.kernel.org/stable/c/7470511d085af1c7a043a60e53d52b512d5a10b1"
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        {
          "url": "https://git.kernel.org/stable/c/0c054227479ed7e36ebccb3a558bc0ef698264f6"
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      ],
      "title": "ksmbd: fix use-after-free of conn-\u003epreauth_info in concurrent SMB2 NEGOTIATE",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72422",
    "datePublished": "2026-08-15T05:56:41.090Z",
    "dateReserved": "2026-08-09T03:40:39.927Z",
    "dateUpdated": "2026-08-17T05:44:02.758Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72422",
      "date": "2026-09-01",
      "epss": "0.0066",
      "percentile": "0.49101"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72422\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:15.987\",\"lastModified\":\"2026-08-17T06:19:09.393\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nksmbd: fix use-after-free of conn-\u003epreauth_info in concurrent SMB2 NEGOTIATE\\n\\nconn-\u003epreauth_info is shared connection state (struct\\npreauth_integrity_info, kmalloc-96) that is allocated and freed by the\\nSMB2 NEGOTIATE handler and read by the response send path.\\n\\nsmb2_handle_negotiate() allocates conn-\u003epreauth_info, and on a\\ndeassemble_neg_contexts() failure kfrees it and sets it to NULL. Both the\\nallocation and the free/NULL happen under ksmbd_conn_lock(conn) (the\\nconnection srv_mutex), which is held across the whole handler body.\\n\\nThe response send path smb3_preauth_hash_rsp(), called from the send:\\nblock of __handle_ksmbd_work(), reads conn-\u003epreauth_info and dereferences\\nconn-\u003epreauth_info-\u003ePreauth_HashValue (via\\nksmbd_gen_preauth_integrity_hash()) without taking conn_lock. When a\\nclient drives two SMB2 NEGOTIATE requests on the same connection, one\\nworker can free conn-\u003epreauth_info on the failing-negotiate path while a\\nconcurrent send-path worker is reading it, producing a slab\\nuse-after-free read (KASAN-confirmed).\\n\\nThe send-path read tested conn-\u003epreauth_info for NULL but raced with the\\nfree that occurs between the NULL check and the dereference, so the NULL\\nguard alone does not close the window.\\n\\nSerialize the NEGOTIATE-branch read in smb3_preauth_hash_rsp() under\\nksmbd_conn_lock(conn) and re-check conn-\u003epreauth_info inside the lock.\\nBecause the negotiate handler holds conn_lock across its kfree + NULL\\nassignment, a reader that also takes conn_lock either runs fully before\\nthe allocation or fully after the NULL store, and can never observe the\\nfreed-but-not-yet-NULLed pointer. ksmbd_gen_preauth_integrity_hash()\\ntakes no locks itself (it only computes a SHA-512 over the buffer), so\\nno lock-ordering inversion is introduced, and conn_lock is a sleepable\\nmutex which is safe on this send path (it already performs network I/O).\"}],\"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\":\"dd4e4c811898410e6a3ae3b63207b7c542860907\",\"lessThan\":\"c7bef84740d1d57848c74f6f5b996606e43ea4fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"d0a469122e7bf8338fec1949fb1e8e1290ed8caa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"7470511d085af1c7a043a60e53d52b512d5a10b1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"16a1ecf39c217e3d164bd32ef2a4f650abc067fa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"77bb0bbfcc4e777ca653174689e5e363f8ee63d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"1c89da3baa2b1f269178afa87dc30479b8535776\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aa7253c2393f6dcd6a1468b0792f6da76edad917\",\"lessThan\":\"0c054227479ed7e36ebccb3a558bc0ef698264f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8a8315a5960bd2b5ffc75f44fc089e57c3b17c44\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff20f1875889dbe4a67c9298e609d7c88cf6456d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.15.61\",\"lessThan\":\"5.15.212\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.18.18\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.19.2\",\"lessThan\":\"5.20\",\"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\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c054227479ed7e36ebccb3a558bc0ef698264f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/16a1ecf39c217e3d164bd32ef2a4f650abc067fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1c89da3baa2b1f269178afa87dc30479b8535776\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7470511d085af1c7a043a60e53d52b512d5a10b1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77bb0bbfcc4e777ca653174689e5e363f8ee63d1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7bef84740d1d57848c74f6f5b996606e43ea4fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0a469122e7bf8338fec1949fb1e8e1290ed8caa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T08:04:32+00:00",
      "cve": "CVE-2026-72422",
      "id": "CVE-2026-72422",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: fix use-after-free of conn-\u003epreauth_info in concurrent SMB2 NEGOTIATE",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72422.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.