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CVE-2026-89495 (GCVE-0-2026-89495)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
ocfs2: bound namelen in dlm_migrate_request_handler
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: bound namelen in dlm_migrate_request_handler Patch series "ocfs2/dlm: bound peer-controlled lengths in the o2dlm". The o2dlm receive handlers trust u8 length and count fields from the wire without bounding them, so a node in a DLM domain can corrupt or panic any other node with a malformed message. Three defects: - dlm_migrate_request_handler() passes migrate->namelen unchecked to dlm_init_mle(), which memcpy()s it into the 32-byte mname[] of an o2dlm_mle slab object: a heap out-of-bounds write of up to ~215 attacker-controlled bytes. - dlm_mig_lockres_handler() passes mres->lockname_len unchecked to dlm_init_lockres(), which memcpy()s it into the 32-byte o2dlm_lockname slab object: a heap out-of-bounds write of up to ~223 bytes. - the same handler trusts mres->num_locks without checking that the message is large enough to hold that many entries, so dlm_process_recovery_data() walks mres->ml[] past the kmalloc(data_len) copy and trips a BUG_ON (an out-of-bounds read ending in a panic). The other o2dlm receive handlers already reject an oversized name; the migration and recovery handlers have omitted it since the DLM was added (see the Fixes tags). Patch 1 bounds namelen; patch 2 validates lockname_len, num_locks, and the payload size. Conforming recovery and migration traffic is unaffected. o2net authenticates peers only by the DLM domain key, so any node that has joined the domain -- including a compromised or malicious member -- can send these messages. There is no local trigger; the attacker must already be a member of the cluster. Each sink was confirmed under KASAN with an out-of-tree module mirroring it exactly -- a kmem_cache/kmalloc of the real destination size, then the same unclamped memcpy/loop: slab-out-of-bounds Write for the two writes, Read for the recovery walk, and a panic. A userspace AddressSanitizer build faults identically under -m32 and -m64. Scrubbed logs are available on request. I reported this privately to security@kernel.org and the ocfs2 maintainers on 2026-06-20; with no response after the standard embargo period I am posting the fix publicly. I have no embargo requirement. This patch (of 2): A node receiving a DLM_MIGRATE_REQUEST message trusts the peer-supplied name length (migrate->namelen) without bounding it. dlm_init_mle() then copies that many bytes into the fixed DLM_LOCKID_NAME_MAX-byte mname[] array of an o2dlm_mle slab object, so a malformed message from a cluster peer overflows the slab object by up to ~215 bytes: a heap out-of-bounds write of attacker-controlled data, reachable by any node in the domain. Reject an oversized name, the way dlm_master_request_handler() and the other o2dlm receive handlers already do; the migration handler omits the check entirely. Conforming messages are unaffected.
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: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < e1288865b8ceac0dcd1009ecba43de961f13d5bd (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < aabc5d8388e6f8826345f0073455dbcaaaa6491d (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < 006c96ea488eca2ef5155ec76038e0a4dbf65f0a (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < 24989909d3413b44b104102caa6661b1e424ba0f (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < f8658ee3327f73bd81c0bcd07cdeb5a8527fac98 (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < de10cd3b062a5235af754925fcf49beb5a1109d4 (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < 2487bea2098322669f0563baff53e797486b823f (git)
Affected: 6714d8e86bf443f6f7af50f9d432025649f091f5 , < ea5b5609305a8437bc955a0834a530c12246d78f (git)
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Linux Linux Affected: 2.6.16
Unaffected: 0 , < 2.6.16 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: bound namelen in dlm_migrate_request_handler\n\nPatch series \"ocfs2/dlm: bound peer-controlled lengths in the o2dlm\".\n\nThe o2dlm receive handlers trust u8 length and count fields from the wire\nwithout bounding them, so a node in a DLM domain can corrupt or panic any\nother node with a malformed message.  Three defects:\n\n  - dlm_migrate_request_handler() passes migrate-\u003enamelen unchecked to\n    dlm_init_mle(), which memcpy()s it into the 32-byte mname[] of an\n    o2dlm_mle slab object: a heap out-of-bounds write of up to ~215\n    attacker-controlled bytes.\n\n  - dlm_mig_lockres_handler() passes mres-\u003elockname_len unchecked to\n    dlm_init_lockres(), which memcpy()s it into the 32-byte o2dlm_lockname\n    slab object: a heap out-of-bounds write of up to ~223 bytes.\n\n  - the same handler trusts mres-\u003enum_locks without checking that the\n    message is large enough to hold that many entries, so\n    dlm_process_recovery_data() walks mres-\u003eml[] past the kmalloc(data_len)\n    copy and trips a BUG_ON (an out-of-bounds read ending in a panic).\n\nThe other o2dlm receive handlers already reject an oversized name; the\nmigration and recovery handlers have omitted it since the DLM was added\n(see the Fixes tags).  Patch 1 bounds namelen; patch 2 validates\nlockname_len, num_locks, and the payload size.  Conforming recovery and\nmigration traffic is unaffected.\n\no2net authenticates peers only by the DLM domain key, so any node that has\njoined the domain -- including a compromised or malicious member -- can\nsend these messages.  There is no local trigger; the attacker must already\nbe a member of the cluster.\n\nEach sink was confirmed under KASAN with an out-of-tree module mirroring\nit exactly -- a kmem_cache/kmalloc of the real destination size, then the\nsame unclamped memcpy/loop: slab-out-of-bounds Write for the two writes,\nRead for the recovery walk, and a panic.  A userspace AddressSanitizer\nbuild faults identically under -m32 and -m64.  Scrubbed logs are available\non request.\n\nI reported this privately to security@kernel.org and the ocfs2 maintainers\non 2026-06-20; with no response after the standard embargo period I am\nposting the fix publicly.  I have no embargo requirement.\n\n\nThis patch (of 2):\n\nA node receiving a DLM_MIGRATE_REQUEST message trusts the peer-supplied\nname length (migrate-\u003enamelen) without bounding it.  dlm_init_mle() then\ncopies that many bytes into the fixed DLM_LOCKID_NAME_MAX-byte mname[]\narray of an o2dlm_mle slab object, so a malformed message from a cluster\npeer overflows the slab object by up to ~215 bytes: a heap out-of-bounds\nwrite of attacker-controlled data, reachable by any node in the domain.\n\nReject an oversized name, the way dlm_master_request_handler() and the\nother o2dlm receive handlers already do; the migration handler omits the\ncheck entirely.  Conforming messages are unaffected."
        }
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            "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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              "value": "AV:N - DLM_MIGRATE_REQUEST is received and dispatched by the ocfs2 o2net TCP cluster transport, so dlm_migrate_request_handler() is reached through network protocol messages from a peer node.\nAC:L - A cluster peer can send a crafted DLM_MIGRATE_REQUEST with attacker-chosen namelen; dlm_init_mle() then memcpy()s that length into the 32-byte mname[] with no race or other condition outside the attacker\u0027s control.\nPR:N - o2net gates peers by configured node IP, heartbeat, and the DLM domain key, with no user authentication or target-local privilege check before the handler runs, so exploitation needs no account on the victim.\nUI:N - Once the OCFS2/DLM domain is joined, exploitation is driven entirely by attacker-sent o2net messages and requires no victim user action such as mounting or opening a file.\nS:U - The heap overflow and resulting kernel impact remain within the same kernel and OCFS2 cluster-node security authority and do not cross a guest-to-host or IOMMU boundary.\nC:H - Unchecked namelen produces a heap out-of-bounds write of attacker-controlled bytes past the o2dlm_mle slab object and an out-of-bounds read of the source name buffer, which can disclose adjacent kernel memory.\nI:H - dlm_init_mle() memcpy()s up to 255 attacker-controlled bytes into the 32-byte mname[] of an o2dlm_mle slab object, overflowing the object by about 215 bytes and enabling overwrite of adjacent heap objects and kernel control-flow hijacking.\nA:H - The heap out-of-bounds write past the o2dlm_mle slab object can oops or panic the receiving node, fully denying availability."
            }
          ]
        }
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        "dateUpdated": "2026-09-14T12:00:29.988Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d"
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        {
          "url": "https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f"
        }
      ],
      "title": "ocfs2: bound namelen in dlm_migrate_request_handler",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89495",
    "datePublished": "2026-09-11T19:43:46.107Z",
    "dateReserved": "2026-09-11T19:38:34.714Z",
    "dateUpdated": "2026-09-14T12:00:29.988Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89495",
      "date": "2026-09-15",
      "epss": "0.00704",
      "percentile": "0.51425"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:46:00.000Z",
      "cve": "CVE-2026-89495",
      "id": "msrc_CVE-2026-89495",
      "initial_release_date": "2026-09-13T01:02:51.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ocfs2: bound namelen in dlm_migrate_request_handler",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89495.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89495\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:31.493\",\"lastModified\":\"2026-09-14T13:19:06.590\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: bound namelen in dlm_migrate_request_handler\\n\\nPatch series \\\"ocfs2/dlm: bound peer-controlled lengths in the o2dlm\\\".\\n\\nThe o2dlm receive handlers trust u8 length and count fields from the wire\\nwithout bounding them, so a node in a DLM domain can corrupt or panic any\\nother node with a malformed message.  Three defects:\\n\\n  - dlm_migrate_request_handler() passes migrate-\u003enamelen unchecked to\\n    dlm_init_mle(), which memcpy()s it into the 32-byte mname[] of an\\n    o2dlm_mle slab object: a heap out-of-bounds write of up to ~215\\n    attacker-controlled bytes.\\n\\n  - dlm_mig_lockres_handler() passes mres-\u003elockname_len unchecked to\\n    dlm_init_lockres(), which memcpy()s it into the 32-byte o2dlm_lockname\\n    slab object: a heap out-of-bounds write of up to ~223 bytes.\\n\\n  - the same handler trusts mres-\u003enum_locks without checking that the\\n    message is large enough to hold that many entries, so\\n    dlm_process_recovery_data() walks mres-\u003eml[] past the kmalloc(data_len)\\n    copy and trips a BUG_ON (an out-of-bounds read ending in a panic).\\n\\nThe other o2dlm receive handlers already reject an oversized name; the\\nmigration and recovery handlers have omitted it since the DLM was added\\n(see the Fixes tags).  Patch 1 bounds namelen; patch 2 validates\\nlockname_len, num_locks, and the payload size.  Conforming recovery and\\nmigration traffic is unaffected.\\n\\no2net authenticates peers only by the DLM domain key, so any node that has\\njoined the domain -- including a compromised or malicious member -- can\\nsend these messages.  There is no local trigger; the attacker must already\\nbe a member of the cluster.\\n\\nEach sink was confirmed under KASAN with an out-of-tree module mirroring\\nit exactly -- a kmem_cache/kmalloc of the real destination size, then the\\nsame unclamped memcpy/loop: slab-out-of-bounds Write for the two writes,\\nRead for the recovery walk, and a panic.  A userspace AddressSanitizer\\nbuild faults identically under -m32 and -m64.  Scrubbed logs are available\\non request.\\n\\nI reported this privately to security@kernel.org and the ocfs2 maintainers\\non 2026-06-20; with no response after the standard embargo period I am\\nposting the fix publicly.  I have no embargo requirement.\\n\\n\\nThis patch (of 2):\\n\\nA node receiving a DLM_MIGRATE_REQUEST message trusts the peer-supplied\\nname length (migrate-\u003enamelen) without bounding it.  dlm_init_mle() then\\ncopies that many bytes into the fixed DLM_LOCKID_NAME_MAX-byte mname[]\\narray of an o2dlm_mle slab object, so a malformed message from a cluster\\npeer overflows the slab object by up to ~215 bytes: a heap out-of-bounds\\nwrite of attacker-controlled data, reachable by any node in the domain.\\n\\nReject an oversized name, the way dlm_master_request_handler() and the\\nother o2dlm receive handlers already do; the migration handler omits the\\ncheck entirely.  Conforming messages are unaffected.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/dlm/dlmmaster.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"e1288865b8ceac0dcd1009ecba43de961f13d5bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"aabc5d8388e6f8826345f0073455dbcaaaa6491d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"006c96ea488eca2ef5155ec76038e0a4dbf65f0a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"24989909d3413b44b104102caa6661b1e424ba0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"f8658ee3327f73bd81c0bcd07cdeb5a8527fac98\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"de10cd3b062a5235af754925fcf49beb5a1109d4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"2487bea2098322669f0563baff53e797486b823f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6714d8e86bf443f6f7af50f9d432025649f091f5\",\"lessThan\":\"ea5b5609305a8437bc955a0834a530c12246d78f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/dlm/dlmmaster.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-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: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/006c96ea488eca2ef5155ec76038e0a4dbf65f0a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2487bea2098322669f0563baff53e797486b823f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/24989909d3413b44b104102caa6661b1e424ba0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aabc5d8388e6f8826345f0073455dbcaaaa6491d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de10cd3b062a5235af754925fcf49beb5a1109d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1288865b8ceac0dcd1009ecba43de961f13d5bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8658ee3327f73bd81c0bcd07cdeb5a8527fac98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:33+00:00",
      "cve": "CVE-2026-89495",
      "id": "CVE-2026-89495",
      "initial_release_date": "2026-09-11T19:43:46.107000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: Arbitrary code execution and Denial of Service via malformed Distributed Lock Manager messages",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89495.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:02:51Z",
      "cve": "CVE-2026-89495",
      "id": "CVE-2026-89495",
      "initial_release_date": "2026-09-16T00:02:51Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89495",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89495.json",
      "version": "2"
    }
  }
}



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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.