CVE-2026-46036

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46036", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.093Z", "datePublished": "2026-05-27T12:56:46.381Z", "dateUpdated": "2026-08-05T12:29:15.525Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:29:15.525Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex\n\nvfio_cdx_set_msi_trigger() reads vdev->config_msi and operates on the\nvdev->cdx_irqs array based on its value, but provides no serialization\nagainst concurrent VFIO_DEVICE_SET_IRQS ioctls. Two callers can race\nsuch that one observes config_msi as set while another clears it and\nfrees cdx_irqs via vfio_cdx_msi_disable(), resulting in a use-after-free\nof the cdx_irqs array.\n\nAdd a cdx_irqs_lock mutex to struct vfio_cdx_device and acquire it in\nvfio_cdx_set_msi_trigger(), which is the single chokepoint through\nwhich all updates to config_msi, cdx_irqs, and msi_count flow, covering\nboth the ioctl path and the close-device cleanup path. This keeps the\ntest of config_msi atomic with the subsequent enable, disable, or\ntrigger operations.\n\nDrop the pre-call !cdx_irqs test from vfio_cdx_irqs_cleanup() as part\nof this change: the optimization it provided is redundant with the\n!config_msi early-return inside vfio_cdx_msi_disable(), and leaving the\ntest in place would be an unsynchronized read of state the new lock is\nmeant to protect."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only via ioctl(VFIO_DEVICE_SET_IRQS) on a local /dev/vfio device file; there is no network or adjacent-network exposure.\nAC:L - This is an attacker-controlled race \u2014 the attacker issues concurrent enable/trigger and disable SET_IRQS ioctls from two threads on the same fd, controlling both sides, and the unserialized core dispatch lets them run in parallel and be hammered until won.\nPR:L - VFIO's threat model hands the device fd to unprivileged userspace (VM/passthrough processes), so an attacker only needs access to an already-bound vfio-cdx device fd, not init-namespace root; when uncertain, the higher-severity L is chosen.\nUI:N - Triggering the race requires only the attacker's own concurrent ioctls; no victim action is needed.\nS:U - The use-after-free corrupts the kernel's own cdx_irqs management array within the kernel security authority and does not cross an IOMMU/VM boundary.\nC:H - Use-after-free of a heap array whose freed contents are read back (including pointers) allows the attacker to reallocate the slab with controlled data and disclose kernel memory.\nI:H - The freed array's entries (a dereferenced/callable eventfd_ctx pointer and pointers passed to kfree/free_irq) enable heap-spray-based arbitrary write and control-flow hijacking.\nA:H - The use-after-free reliably causes kernel oops/panic when the freed cdx_irqs array is accessed."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vfio/cdx/intr.c", "drivers/vfio/cdx/main.c", "drivers/vfio/cdx/private.h"], "versions": [{"version": "848e447e000c41894ff931dc7c004fd42c8840f8", "lessThan": "ddf96e23c366c566283fce8377928851fa7f5e81", "status": "affected", "versionType": "git"}, {"version": "848e447e000c41894ff931dc7c004fd42c8840f8", "lessThan": "7b436ade16cc81095d79b79f8efa3af0a4f5c5a2", "status": "affected", "versionType": "git"}, {"version": "848e447e000c41894ff931dc7c004fd42c8840f8", "lessThan": "7530f34ec0ca1438d45a75dcb43183a1cc92eced", "status": "affected", "versionType": "git"}, {"version": "848e447e000c41894ff931dc7c004fd42c8840f8", "lessThan": "670e8864b1a218d72f08db40d0103adf38fa1d9b", "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/vfio/cdx/intr.c", "drivers/vfio/cdx/main.c", "drivers/vfio/cdx/private.h"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.10", "versionEndExcluding": "6.12.86"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.27"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.0.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ddf96e23c366c566283fce8377928851fa7f5e81"}, {"url": "https://git.kernel.org/stable/c/7b436ade16cc81095d79b79f8efa3af0a4f5c5a2"}, {"url": "https://git.kernel.org/stable/c/7530f34ec0ca1438d45a75dcb43183a1cc92eced"}, {"url": "https://git.kernel.org/stable/c/670e8864b1a218d72f08db40d0103adf38fa1d9b"}], "title": "vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/vfio/cdx/intr.c", "drivers/vfio/cdx/main.c", "drivers/vfio/cdx/private.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ddf96e23c366c566283fce8377928851fa7f5e81", "status": "affected", "version": "848e447e000c41894ff931dc7c004fd42c8840f8", "versionType": "git"}, {"lessThan": "7b436ade16cc81095d79b79f8efa3af0a4f5c5a2", "status": "affected", "version": "848e447e000c41894ff931dc7c004fd42c8840f8", "versionType": "git"}, {"lessThan": "7530f34ec0ca1438d45a75dcb43183a1cc92eced", "status": "affected", "version": "848e447e000c41894ff931dc7c004fd42c8840f8", "versionType": "git"}, {"lessThan": "670e8864b1a218d72f08db40d0103adf38fa1d9b", "status": "affected", "version": "848e447e000c41894ff931dc7c004fd42c8840f8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/vfio/cdx/intr.c", "drivers/vfio/cdx/main.c", "drivers/vfio/cdx/private.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.10"}, {"lessThan": "6.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.86", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.27", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DE217E72-2117-418C-97F0-213685E36DC0", "versionEndExcluding": "6.12.86", "versionStartIncluding": "6.10", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A10AC84F-C058-47D5-85B4-E6E51A613B74", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex\n\nvfio_cdx_set_msi_trigger() reads vdev->config_msi and operates on the\nvdev->cdx_irqs array based on its value, but provides no serialization\nagainst concurrent VFIO_DEVICE_SET_IRQS ioctls. Two callers can race\nsuch that one observes config_msi as set while another clears it and\nfrees cdx_irqs via vfio_cdx_msi_disable(), resulting in a use-after-free\nof the cdx_irqs array.\n\nAdd a cdx_irqs_lock mutex to struct vfio_cdx_device and acquire it in\nvfio_cdx_set_msi_trigger(), which is the single chokepoint through\nwhich all updates to config_msi, cdx_irqs, and msi_count flow, covering\nboth the ioctl path and the close-device cleanup path. This keeps the\ntest of config_msi atomic with the subsequent enable, disable, or\ntrigger operations.\n\nDrop the pre-call !cdx_irqs test from vfio_cdx_irqs_cleanup() as part\nof this change: the optimization it provided is redundant with the\n!config_msi early-return inside vfio_cdx_msi_disable(), and leaving the\ntest in place would be an unsynchronized read of state the new lock is\nmeant to protect."}], "id": "CVE-2026-46036", "lastModified": "2026-06-17T10:52:56.477", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-27T14:17:22.913", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/670e8864b1a218d72f08db40d0103adf38fa1d9b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7530f34ec0ca1438d45a75dcb43183a1cc92eced"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b436ade16cc81095d79b79f8efa3af0a4f5c5a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ddf96e23c366c566283fce8377928851fa7f5e81"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: vfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex", "id": "2482077", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482077"}, "csaw": false, "cwe": "CWE-820", "details": ["A flaw was found in the Linux kernel's vfio/cdx component. A race condition can occur during concurrent VFIO_DEVICE_SET_IRQS ioctls (input/output control calls), specifically within the vfio_cdx_set_msi_trigger() function. This allows two callers to interact in a way that leads to a use-after-free vulnerability of the cdx_irqs array. A local attacker could exploit this to cause a denial of service or potentially achieve privilege escalation."], "name": "CVE-2026-46036", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46036\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46036\nhttps://lore.kernel.org/linux-cve-announce/2026052750-CVE-2026-46036-be69@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[848e447e000c41894ff931dc7c004fd42c8840f8,ddf96e23c366c566283fce8377928851fa7f5e81)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[848e447e000c41894ff931dc7c004fd42c8840f8,7b436ade16cc81095d79b79f8efa3af0a4f5c5a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[848e447e000c41894ff931dc7c004fd42c8840f8,7530f34ec0ca1438d45a75dcb43183a1cc92eced)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[848e447e000c41894ff931dc7c004fd42c8840f8,670e8864b1a218d72f08db40d0103adf38fa1d9b)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.86,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T20:30:40.560790+00:00", "updated": "2026-06-17T23:45:13.998022+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}