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CVE-2026-72360 (GCVE-0-2026-72360)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:43
VLAI
Title
drm/xe/pf: Don't attempt to process FAST_REQ or EVENT relays
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe/pf: Don't attempt to process FAST_REQ or EVENT relays Currently defined VF/PF relay actions use regular REQUEST messages only and the PF shouldn't attempt to handle FAST_REQUEST nor EVENT messages as this would result in breaking the VFPF ABI protocol and also might trigger an assert on the PF side. (cherry picked from commit 1714d360fc5ae2e0886a69e979095d9c7ff3568a)
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 98e62805921cebcd2fcac3692037ca2ebef63b4a , < 499be4b5d64209e9f18c9442f9fbeef7155ae900 (git)
Affected: 98e62805921cebcd2fcac3692037ca2ebef63b4a , < adc7dda728ca3e340a413e3bbc10cf159e1866a4 (git)
Affected: 98e62805921cebcd2fcac3692037ca2ebef63b4a , < a4208d8032abd7f591581994f31e23b80b8fe659 (git)
Affected: 98e62805921cebcd2fcac3692037ca2ebef63b4a , < ed8b0d731892c68b41ecbd27c952af284816dec1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (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)
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_guc_relay.c"
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "6.11",
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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\ndrm/xe/pf: Don\u0027t attempt to process FAST_REQ or EVENT relays\n\nCurrently defined VF/PF relay actions use regular REQUEST messages\nonly and the PF shouldn\u0027t attempt to handle FAST_REQUEST nor EVENT\nmessages as this would result in breaking the VFPF ABI protocol\nand also might trigger an assert on the PF side.\n\n(cherry picked from commit 1714d360fc5ae2e0886a69e979095d9c7ff3568a)"
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - A malicious VM guest with an assigned Intel Xe SR-IOV VF reaches the bug by sending crafted GuC relay messages through the local VF-to-PF driver path (guest kernel/driver to host PF via GuC), not over a remote network protocol.\nAC:L - Once assigned an Xe SR-IOV VF, a cloud GPU tenant can reliably inject FAST_REQUEST or EVENT relay messages (e.g., via a modified guest driver) and control both sides of the transaction without uncontrollable timing or memory-layout races.\nPR:L - Exploitation requires tenant-level access to a VM with a passthrough Xe SR-IOV VF (typically root or a custom guest kernel/driver to craft non-REQUEST relay types) but does not require host administrator privileges on the PF.\nUI:N - No separate victim action is required; the attacker triggers the flaw directly by sending malformed FAST_REQUEST or EVENT relay messages from their own guest environment.\nS:C - A malicious VF guest causes the host PF kernel driver to mishandle GuC relay messages, crossing the VM/hypervisor security boundary in SR-IOV GPU virtualization (guest-to-host impact on the PF).\nC:N - No memory corruption or out-of-band read occurs; VF2PF handshake and runtime-query handlers return the same bounded register data as legitimate REQUEST messages, with no additional confidentiality impact.\nI:H - FAST_REQUEST and EVENT messages are type-confused with REQUEST and routed to xe_gt_sriov_pf_service_process_request(), causing the PF to emit protocol-invalid responses that corrupt host VF/PF relay and GuC communication state.\nA:H - Violating the VF/PF relay ABI by replying to EVENT/FAST_REQUEST messages can desynchronize host GuC relay handling and trigger PF asserts (drm_WARN on debug builds), risking host GPU driver failure or denial of service affecting all tenants on the device."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:17.664Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/499be4b5d64209e9f18c9442f9fbeef7155ae900"
        },
        {
          "url": "https://git.kernel.org/stable/c/adc7dda728ca3e340a413e3bbc10cf159e1866a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4208d8032abd7f591581994f31e23b80b8fe659"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed8b0d731892c68b41ecbd27c952af284816dec1"
        }
      ],
      "title": "drm/xe/pf: Don\u0027t attempt to process FAST_REQ or EVENT relays",
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72360",
    "datePublished": "2026-08-15T05:56:00.076Z",
    "dateReserved": "2026-08-09T03:40:39.921Z",
    "dateUpdated": "2026-08-17T05:43:17.664Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72360",
      "date": "2026-09-04",
      "epss": "0.00171",
      "percentile": "0.06651"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:16:27+00:00",
      "cve": "CVE-2026-72360",
      "id": "CVE-2026-72360",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/xe/pf: Don\u0027t attempt to process FAST_REQ or EVENT relays",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72360.json",
      "version": "3"
    }
  }
}



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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.