264 lines
16 KiB
JSON
264 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89495",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.714Z",
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"datePublished": "2026-09-11T19:43:46.107Z",
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"dateUpdated": "2026-10-19T08:47:46.925Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:47:46.925Z"
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},
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"descriptions": [
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{
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"lang": "en",
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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->namelen 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->lockname_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->num_locks without checking that the\n message is large enough to hold that many entries, so\n dlm_process_recovery_data() walks mres->ml[] 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->namelen) 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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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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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's 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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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ocfs2/dlm/dlmmaster.c"
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"fs/ocfs2/dlm/dlmmaster.c"
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],
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"version": "0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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},
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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"version": "6.1.188",
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},
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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},
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"status": "unaffected",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"url": "https://git.kernel.org/stable/c/ea5b5609305a8437bc955a0834a530c12246d78f"
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}
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],
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"title": "ocfs2: bound namelen in dlm_migrate_request_handler",
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