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CVE-2026-89508 (GCVE-0-2026-89508)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
RDMA/ucma: Lock the handler in ucma_set_ib_path()
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Lock the handler in ucma_set_ib_path() ucma_set_ib_path() calls ucma_event_handler() straight from the write() path, without the handler lock that keeps ctx->file stable while a uevent is queued. The handler re-reads ctx->file for every dereference: mutex_lock(&ctx->file->mut); /* file A */ list_add_tail(&uevent->list, &ctx->file->event_list); /* file B */ mutex_unlock(&ctx->file->mut); /* file B */ wake_up_interruptible(&ctx->file->poll_wait); /* file B */ A concurrent ucma_migrate_id() reassigns ctx->file while the SET_OPTION caller sleeps in mutex_lock(), so the list_add_tail() lands on file B's event_list while only file A's mutex is held, racing every other user of that list: BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0 Read of size 8 at addr ffff888153c6a418 by task poc_corr/486 Call Trace: __list_add_valid_or_report+0x1aa/0x1c0 ucma_event_handler+0x1be/0xc00 ucma_set_ib_path+0x45e/0x710 ucma_set_option+0x32e/0x590 ucma_write+0x1f9/0x330 Allocated by task 505: ucma_write_cm_event+0x1a1/0x660 Freed by task 505: kfree+0x1da/0x4c0 ucma_get_event+0x5d5/0x7e0 The freed object is a ucma_event that another thread dequeued from file B's list under file B's mutex. File A's mut is left held on top of that, wedging its next writer in uninterruptible sleep. This path needs a bound and address-resolved cm_id, so it requires an RDMA device to be present. Take the handler lock around the call.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < 3dd07b369371a2f29e1c3caf1ade85bb92b4c551 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < b2da0d488a1c72956ebb0a57015ee8ee6a2f7748 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < 71dc206f2e2a645dac78879768762451aa1799f7 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < 764586f8f6180084c5a7d622120f526acc6ce0c9 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < 28ac2dd416482d1c763c4af5d61af465b387fb50 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < 43a7d8ae9f645dc00235cfa4bf57673c20b769f8 (git)
Affected: 09e328e47a695b0d346598f5d6593ee598e64885 , < ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (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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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ucma: Lock the handler in ucma_set_ib_path()\n\nucma_set_ib_path() calls ucma_event_handler() straight from the write()\npath, without the handler lock that keeps ctx-\u003efile stable while a uevent\nis queued.  The handler re-reads ctx-\u003efile for every dereference:\n\n\tmutex_lock(\u0026ctx-\u003efile-\u003emut);\t\t\t/* file A */\n\tlist_add_tail(\u0026uevent-\u003elist, \u0026ctx-\u003efile-\u003eevent_list);\t/* file B */\n\tmutex_unlock(\u0026ctx-\u003efile-\u003emut);\t\t\t/* file B */\n\twake_up_interruptible(\u0026ctx-\u003efile-\u003epoll_wait);\t/* file B */\n\nA concurrent ucma_migrate_id() reassigns ctx-\u003efile while the SET_OPTION\ncaller sleeps in mutex_lock(), so the list_add_tail() lands on file B\u0027s\nevent_list while only file A\u0027s mutex is held, racing every other user of\nthat list:\n\n  BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0\n  Read of size 8 at addr ffff888153c6a418 by task poc_corr/486\n  Call Trace:\n   __list_add_valid_or_report+0x1aa/0x1c0\n   ucma_event_handler+0x1be/0xc00\n   ucma_set_ib_path+0x45e/0x710\n   ucma_set_option+0x32e/0x590\n   ucma_write+0x1f9/0x330\n  Allocated by task 505:\n   ucma_write_cm_event+0x1a1/0x660\n  Freed by task 505:\n   kfree+0x1da/0x4c0\n   ucma_get_event+0x5d5/0x7e0\n\nThe freed object is a ucma_event that another thread dequeued from file B\u0027s\nlist under file B\u0027s mutex.  File A\u0027s mut is left held on top of that,\nwedging its next writer in uninterruptible sleep.\n\nThis path needs a bound and address-resolved cm_id, so it requires an RDMA\ndevice to be present.\n\nTake the handler lock around the call."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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            {
              "lang": "en",
              "value": "AV:L - The bug is reached only via write() on /dev/infiniband/rdma_cm (SET_OPTION -\u003e ucma_set_option -\u003e ucma_set_ib_path). A remote RDMA peer cannot invoke this path; in-kernel CM event delivery already holds the handler lock that this write path omitted.\nAC:L - The attacker controls both sides of the race: one thread issues SET_OPTION (RDMA_OPTION_IB_PATH) while another MIGRATE_IDs the cm_id to a second fd and a third GET_EVENTs to free the uevent. The window is the mutex_lock() sleep in ucma_event_handler, which the attacker can widen, and it was reproduced by poc_corr.\nPR:L - ucma is a miscdevice with mode 0666 and ucma_write() has no capability check. Any unprivileged local user can open /dev/infiniband/rdma_cm, CREATE_ID, resolve an address on an existing RDMA device, then issue SET_OPTION and MIGRATE_ID.\nUI:N - The attacker opens rdma_cm, creates and migrates their own cm_id, and issues the concurrent SET_OPTION and GET_EVENT writes themselves; no other user or administrator action is required.\nS:U - The use-after-free and list corruption are confined to host-kernel objects (ucma_event and file event_list). This is a standard local kernel compromise and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The race is a slab use-after-free of struct ucma_event (KASAN in __list_add_valid_or_report after GET_EVENT kfree). Reclaiming the freed object gives the attacker control over list pointers and event contents, enabling disclosure of kernel memory.\nI:H - list_add_tail runs on file B\u0027s event_list while only file A\u0027s mutex is held, corrupting list pointers. Combined with UAF reclaim of ucma_event, this is a classic kernel list-unlink arbitrary-write primitive suitable for control-flow hijacking.\nA:H - The UAF and list_debug BUG can oops the kernel, and the mismatched mutex_unlock leaves file A\u0027s mut held so the next writer sleeps uninterruptibly in D state, hanging the system."
            }
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        }
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        "dateUpdated": "2026-09-14T12:00:35.341Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3dd07b369371a2f29e1c3caf1ade85bb92b4c551"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2da0d488a1c72956ebb0a57015ee8ee6a2f7748"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/71dc206f2e2a645dac78879768762451aa1799f7"
        },
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          "url": "https://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9"
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        {
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        },
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          "url": "https://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820"
        }
      ],
      "title": "RDMA/ucma: Lock the handler in ucma_set_ib_path()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89508",
    "datePublished": "2026-09-11T19:43:54.682Z",
    "dateReserved": "2026-09-11T19:38:34.716Z",
    "dateUpdated": "2026-09-14T12:00:35.341Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89508",
      "date": "2026-09-15",
      "epss": "0.00125",
      "percentile": "0.02554"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-15T01:45:54.000Z",
      "cve": "CVE-2026-89508",
      "id": "msrc_CVE-2026-89508",
      "initial_release_date": "2026-09-13T01:02:21.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RDMA/ucma: Lock the handler in ucma_set_ib_path()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89508.json",
      "version": "3"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89508\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:33.143\",\"lastModified\":\"2026-09-14T13:19:07.370\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRDMA/ucma: Lock the handler in ucma_set_ib_path()\\n\\nucma_set_ib_path() calls ucma_event_handler() straight from the write()\\npath, without the handler lock that keeps ctx-\u003efile stable while a uevent\\nis queued.  The handler re-reads ctx-\u003efile for every dereference:\\n\\n\\tmutex_lock(\u0026ctx-\u003efile-\u003emut);\\t\\t\\t/* file A */\\n\\tlist_add_tail(\u0026uevent-\u003elist, \u0026ctx-\u003efile-\u003eevent_list);\\t/* file B */\\n\\tmutex_unlock(\u0026ctx-\u003efile-\u003emut);\\t\\t\\t/* file B */\\n\\twake_up_interruptible(\u0026ctx-\u003efile-\u003epoll_wait);\\t/* file B */\\n\\nA concurrent ucma_migrate_id() reassigns ctx-\u003efile while the SET_OPTION\\ncaller sleeps in mutex_lock(), so the list_add_tail() lands on file B\u0027s\\nevent_list while only file A\u0027s mutex is held, racing every other user of\\nthat list:\\n\\n  BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0\\n  Read of size 8 at addr ffff888153c6a418 by task poc_corr/486\\n  Call Trace:\\n   __list_add_valid_or_report+0x1aa/0x1c0\\n   ucma_event_handler+0x1be/0xc00\\n   ucma_set_ib_path+0x45e/0x710\\n   ucma_set_option+0x32e/0x590\\n   ucma_write+0x1f9/0x330\\n  Allocated by task 505:\\n   ucma_write_cm_event+0x1a1/0x660\\n  Freed by task 505:\\n   kfree+0x1da/0x4c0\\n   ucma_get_event+0x5d5/0x7e0\\n\\nThe freed object is a ucma_event that another thread dequeued from file B\u0027s\\nlist under file B\u0027s mutex.  File A\u0027s mut is left held on top of that,\\nwedging its next writer in uninterruptible sleep.\\n\\nThis path needs a bound and address-resolved cm_id, so it requires an RDMA\\ndevice to be present.\\n\\nTake the handler lock around the call.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/infiniband/core/ucma.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"3dd07b369371a2f29e1c3caf1ade85bb92b4c551\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"b2da0d488a1c72956ebb0a57015ee8ee6a2f7748\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"71dc206f2e2a645dac78879768762451aa1799f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"764586f8f6180084c5a7d622120f526acc6ce0c9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"28ac2dd416482d1c763c4af5d61af465b387fb50\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"43a7d8ae9f645dc00235cfa4bf57673c20b769f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"09e328e47a695b0d346598f5d6593ee598e64885\",\"lessThan\":\"ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/infiniband/core/ucma.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/28ac2dd416482d1c763c4af5d61af465b387fb50\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3dd07b369371a2f29e1c3caf1ade85bb92b4c551\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43a7d8ae9f645dc00235cfa4bf57673c20b769f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/71dc206f2e2a645dac78879768762451aa1799f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/764586f8f6180084c5a7d622120f526acc6ce0c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2da0d488a1c72956ebb0a57015ee8ee6a2f7748\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:49:39+00:00",
      "cve": "CVE-2026-89508",
      "id": "CVE-2026-89508",
      "initial_release_date": "2026-09-11T19:43:54.682000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: RDMA/ucma use-after-free vulnerability leading to denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89508.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:02:38Z",
      "cve": "CVE-2026-89508",
      "id": "CVE-2026-89508",
      "initial_release_date": "2026-09-12T16:27:15Z",
      "product_status:known_affected": "228",
      "product_status:known_not_affected": "125",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89508",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89508.json",
      "version": "4"
    }
  }
}



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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.