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CVE-2026-80645 (GCVE-0-2026-80645)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21
VLAI
Title
rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()
Summary
In the Linux kernel, the following vulnerability has been resolved: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc() With a list_for_each() loop, if we don't find the item we are looking for in the list, then the loop exits with the iterator, which is "dbell" in this loop, pointing to invalid memory. This code uses the "found" variable to determine if we have found the doorbell we are looking for or not. However, the problem that the "found" variable needs to be set to false at the start of each iteration, otherwise after the first correct doorbell, then everything is marked as found. Reset the "found" to false at the start of the iteration and move the variable inside the loop.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < 9e775c3199903d7c09a52530042b1198eab705bd (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < 81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43 (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < 13092966ba5d8fb214a4efeddc87f9ed0fd2f945 (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < acd54f42abbbd806464468838dbc04efd203d2be (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < 3b5c66e922aa6a3331915a14520848a5b3beccc7 (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < 070f356ea4f419e4e85e4089381f4477f41d969e (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < dc28a14f3e4546b2b06098d24177942540581a5f (git)
Affected: 48618fb4e522d9d02e217ac05f52749545c1af20 , < fc15e3a30ddd950f009c76765331783b9af94a87 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (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)
guessed Create a notification for this product.
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                  "versionStartIncluding": "3.2",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "3.2",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()\n\nWith a list_for_each() loop, if we don\u0027t find the item we are looking for\nin the list, then the loop exits with the iterator, which is \"dbell\" in\nthis loop, pointing to invalid memory.\n\nThis code uses the \"found\" variable to determine if we have found the\ndoorbell we are looking for or not.  However, the problem that the \"found\"\nvariable needs to be set to false at the start of each iteration,\notherwise after the first correct doorbell, then everything is marked as\nfound.\n\nReset the \"found\" to false at the start of the iteration and move the\nvariable inside the loop."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The bug is reached when inbound RapidIO doorbell packets are received by the TSI721 hardware, queued, and processed in tsi721_db_dpc() via tsi721_irqhandler()-\u003etsi721_dbell_handler()-\u003eschedule_work(); any peer on the same SRIO fabric can send these unauthenticated doorbells without local OS access.\nAC:L - On affected systems an attacker who can emit RapidIO doorbells can reliably trigger the flaw by sending a matching doorbell (e.g. rionet JOIN 0x1000) followed by a non-matching one in the same inbound queue; the stale found flag makes this deterministic, not race-dependent.\nPR:N - Exploitation requires no Linux credentials on the victim host; inbound doorbells are accepted from remote fabric endpoints with no authentication, and the vulnerable workqueue path has no capability or permission checks beyond having the TSI721 driver loaded.\nUI:N - No victim interaction is required; the crash is triggered automatically when the hardware receives and the kernel processes the attacker-crafted doorbell sequence.\nS:U - Impact is confined to kernel memory and execution on the host running the TSI721 driver; it does not cross a VM, container, or IOMMU security boundary.\nC:N - The failure mode is a bad pointer dereference/type confusion leading to an invalid indirect call through a mis-cast list head, not an attacker-controlled arbitrary kernel memory read or information disclosure primitive.\nI:H - When found is stale, dbell points at the mport-\u003edbells list head cast to struct rio_dbell, and the kernel invokes dbell-\u003edinb with attacker-controlled doorbell fields; this type confusion can corrupt kernel state or hijack control flow beyond a simple denial of service.\nA:H - Invoking a mis-resolved function pointer from the list-head confusion causes a kernel oops/panic in interrupt-deferred workqueue context, crashing or hanging the entire system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:21:40.217Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9e775c3199903d7c09a52530042b1198eab705bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43"
        },
        {
          "url": "https://git.kernel.org/stable/c/13092966ba5d8fb214a4efeddc87f9ed0fd2f945"
        },
        {
          "url": "https://git.kernel.org/stable/c/acd54f42abbbd806464468838dbc04efd203d2be"
        },
        {
          "url": "https://git.kernel.org/stable/c/3b5c66e922aa6a3331915a14520848a5b3beccc7"
        },
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          "url": "https://git.kernel.org/stable/c/070f356ea4f419e4e85e4089381f4477f41d969e"
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      ],
      "title": "rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80645",
    "datePublished": "2026-08-28T06:48:55.678Z",
    "dateReserved": "2026-08-26T14:34:25.778Z",
    "dateUpdated": "2026-08-29T06:21:40.217Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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    "epss": {
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      "date": "2026-09-17",
      "epss": "0.00259",
      "percentile": "0.17815"
    },
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However, the problem that the \\\"found\\\"\\nvariable needs to be set to false at the start of each iteration,\\notherwise after the first correct doorbell, then everything is marked as\\nfound.\\n\\nReset the \\\"found\\\" to false at the start of the iteration and move the\\nvariable inside the loop.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/rapidio/devices/tsi721.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"9e775c3199903d7c09a52530042b1198eab705bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"13092966ba5d8fb214a4efeddc87f9ed0fd2f945\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"acd54f42abbbd806464468838dbc04efd203d2be\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"3b5c66e922aa6a3331915a14520848a5b3beccc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"070f356ea4f419e4e85e4089381f4477f41d969e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"dc28a14f3e4546b2b06098d24177942540581a5f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"48618fb4e522d9d02e217ac05f52749545c1af20\",\"lessThan\":\"fc15e3a30ddd950f009c76765331783b9af94a87\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/rapidio/devices/tsi721.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"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:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/070f356ea4f419e4e85e4089381f4477f41d969e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/13092966ba5d8fb214a4efeddc87f9ed0fd2f945\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b5c66e922aa6a3331915a14520848a5b3beccc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81c06ef66c3ab6eeaa72eb790c90ae043cdb3d43\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9e775c3199903d7c09a52530042b1198eab705bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acd54f42abbbd806464468838dbc04efd203d2be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc28a14f3e4546b2b06098d24177942540581a5f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc15e3a30ddd950f009c76765331783b9af94a87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T14:55:39+00:00",
      "cve": "CVE-2026-80645",
      "id": "CVE-2026-80645",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rapidio/tsi721: prevent a bad dereference in tsi721_db_dpc()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80645.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:04:43Z",
      "cve": "CVE-2026-80645",
      "id": "CVE-2026-80645",
      "initial_release_date": "2026-08-28T16:35:19Z",
      "product_status:known_affected": "320",
      "product_status:known_not_affected": "33",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80645",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80645.json",
      "version": "5"
    }
  }
}



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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.

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  • 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.
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  • 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.


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