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CVE-2026-89510 (GCVE-0-2026-89510)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00
VLAI
Title
RDMA/cxgb4: Cancel reg_work before freeing device on remove
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Cancel reg_work before freeing device on remove c4iw_uld_state_change() queues reg_work to register the RDMA device. c4iw_remove() can free ctx->dev while this work is pending or running, leaving c4iw_register_device() accessing the freed device. Cancel reg_work before removing the device. The registration work can tear down ctx->dev when registration fails, so do not unregister or deallocate it again in that case. This issue was found by an in-house static analysis tool.
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: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < e6e79e7be87c5ea92728060a3d7fb56890a91e45 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < 672ee1981db10569ec96030bddb322f18382ec04 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < 4681e731db07769846901cfabdd3e53f765eb9d3 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < 3265d558dfafab8f12f5fba06ebbf15cae9f3225 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < fe9c591026c576d8b1f72aab5e4cd67350530763 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < 85f438382a865a4dc4c50e6b884310bb2b60fc4d (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < 320e5258a53af0abc5abd9eb01519a48bab2dee8 (git)
Affected: 1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5 , < a7100601aa1a39f799a566acce10db20eaf4b7f2 (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (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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              "versionType": "original_commit_for_fix"
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/cxgb4: Cancel reg_work before freeing device on remove\n\nc4iw_uld_state_change() queues reg_work to register the RDMA device.\nc4iw_remove() can free ctx-\u003edev while this work is pending or running,\nleaving c4iw_register_device() accessing the freed device.\n\nCancel reg_work before removing the device.  The registration work can\ntear down ctx-\u003edev when registration fails, so do not unregister or\ndeallocate it again in that case.\n\nThis issue was found by an in-house static analysis tool."
        }
      ],
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            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached from c4iw_remove() on local Chelsio T4/T5/T6 RDMA teardown (iw_cxgb4 rmmod, PCI sysfs unbind/hot-remove, EEH reset, or ULD STATE_DOWN/DETACH/FATAL). reg_work is queued from local STATE_UP (cxgb_open/uld_attach), not from c4iw_uld_rx_handler packet processing.\nAC:L - An attacker queues c4iw_register_device via STATE_UP (first cxgb_open or iw_cxgb4 load) then immediately runs c4iw_remove via unbind/rmmod/EEH, controlling both sides of the missing cancel_work_sync race and retrying bind/unbind until the worker uses freed ctx-\u003edev; such UAFs score AC:L.\nPR:L - Per CNA driver-removal UAF precedent, an unprivileged local user on Chelsio iWARP/HPC hosts can spray the freed c4iw_dev/ib_device while privileged or automated teardown proceeds; init-namespace root is not required for the UAF itself.\nUI:N - No victim action such as mounting a filesystem or opening a file is required; the attacker queues reg_work and coordinates driver removal themselves, or piggybacks on routine PCI/module teardown.\nS:U - The use-after-free corrupts the host kernel c4iw_dev/ib_device heap object within the same security authority; it is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - After c4iw_dealloc()/ib_dealloc_device(), c4iw_register_device() still reads ctx-\u003edev (node_guid, ports, ibdev ops) from the freed ib_device; this kernel heap UAF enables arbitrary disclosure via slab reuse.\nI:H - The dangling worker writes ibdev fields, may call ib_register_device() on freed memory, and can double-free via c4iw_dealloc(); heap spraying the ib_device ops table yields write and control-flow hijack primitives.\nA:H - Use-after-free of c4iw_dev from workqueue context during remove causes a kernel oops or panic even when not fully exploited, so availability impact is High."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-09-14T12:00:36.409Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45"
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          "url": "https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89510",
    "datePublished": "2026-09-11T19:43:55.989Z",
    "dateReserved": "2026-09-11T19:38:34.716Z",
    "dateUpdated": "2026-09-14T12:00:36.409Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "cve": "CVE-2026-89510",
      "date": "2026-09-17",
      "epss": "0.00176",
      "percentile": "0.07379"
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RDMA/cxgb4: Cancel reg_work before freeing device on remove",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89510.json",
      "version": "2"
    },
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The registration work can\\ntear down ctx-\u003edev when registration fails, so do not unregister or\\ndeallocate it again in that case.\\n\\nThis issue was found by an in-house static analysis tool.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/infiniband/hw/cxgb4/device.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"e6e79e7be87c5ea92728060a3d7fb56890a91e45\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"672ee1981db10569ec96030bddb322f18382ec04\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"4681e731db07769846901cfabdd3e53f765eb9d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"3265d558dfafab8f12f5fba06ebbf15cae9f3225\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"fe9c591026c576d8b1f72aab5e4cd67350530763\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"85f438382a865a4dc4c50e6b884310bb2b60fc4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"320e5258a53af0abc5abd9eb01519a48bab2dee8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1c8f1da5d851b92aeb81dbbb9ebd516f6e2588f5\",\"lessThan\":\"a7100601aa1a39f799a566acce10db20eaf4b7f2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/infiniband/hw/cxgb4/device.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"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/320e5258a53af0abc5abd9eb01519a48bab2dee8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3265d558dfafab8f12f5fba06ebbf15cae9f3225\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4681e731db07769846901cfabdd3e53f765eb9d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/672ee1981db10569ec96030bddb322f18382ec04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85f438382a865a4dc4c50e6b884310bb2b60fc4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7100601aa1a39f799a566acce10db20eaf4b7f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e6e79e7be87c5ea92728060a3d7fb56890a91e45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fe9c591026c576d8b1f72aab5e4cd67350530763\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T14:49:03+00:00",
      "cve": "CVE-2026-89510",
      "id": "CVE-2026-89510",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/cxgb4: Cancel reg_work before freeing device on remove",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89510.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:02:35Z",
      "cve": "CVE-2026-89510",
      "id": "CVE-2026-89510",
      "initial_release_date": "2026-09-16T00:02:35Z",
      "product_status:known_affected": "335",
      "product_status:known_not_affected": "18",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89510",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89510.json",
      "version": "2"
    }
  }
}



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  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.