{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72360", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.921Z", "datePublished": "2026-08-15T05:56:00.076Z", "dateUpdated": "2026-08-17T05:43:17.664Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:17.664Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pf: Don't attempt to process FAST_REQ or EVENT relays\n\nCurrently defined VF/PF relay actions use regular REQUEST messages\nonly and the PF shouldn't 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": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/xe/xe_guc_relay.c" ], "versions": [ { "version": "98e62805921cebcd2fcac3692037ca2ebef63b4a", "lessThan": "499be4b5d64209e9f18c9442f9fbeef7155ae900", "status": "affected", "versionType": "git" }, { "version": "98e62805921cebcd2fcac3692037ca2ebef63b4a", "lessThan": "adc7dda728ca3e340a413e3bbc10cf159e1866a4", "status": "affected", "versionType": "git" }, { "version": "98e62805921cebcd2fcac3692037ca2ebef63b4a", "lessThan": "a4208d8032abd7f591581994f31e23b80b8fe659", "status": "affected", "versionType": "git" }, { "version": "98e62805921cebcd2fcac3692037ca2ebef63b4a", "lessThan": "ed8b0d731892c68b41ecbd27c952af284816dec1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/xe/xe_guc_relay.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2" } ] } ] } ], "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't attempt to process FAST_REQ or EVENT relays", "x_generator": { "engine": "bippy-1.2.0" } } } }