CVE-2026-46280

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These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first. This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg. during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct. The function is moved earlier\nin the file to avoid a forward declaration."}], "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 - Exploitation requires local syscalls to open the hmm_dmirror character device, issue HMM_DMIRROR_MIGRATE_TO_DEV ioctl, close the fd, and fault migrated pages; there is no network, adjacent-wireless, or physical-device attack path.\nAC:L - The UAF is deterministically triggered by the attacker's own migrate-then-close-then-fault sequence with no race or external timing dependency; the attacker fully controls both sides of the lifecycle.\nPR:L - The vulnerable ioctl and release paths perform no capability or permission checks beyond opening the local character device; any local user who can access /dev/hmm_dmirrorN can execute the full exploit chain without real root privileges in the init namespace.\nUI:N - No victim interaction is required; the attacker triggers the fault themselves by accessing their own migrated pages or aborting for coredump after closing the device file.\nS:U - Impact is confined to kernel memory corruption and panic within the same kernel security boundary; this is a test-module UAF, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - The stale dmirror pointer is dereferenced in dmirror_devmem_fault() to read freed kmalloc memory (dmirror->mdevice, dmirror->flags), giving a classic UAF information-disclosure primitive.\nI:H - The fault handler continues to use the freed dmirror for migration and xa_erase on dmirror->pt, enabling heap reuse attacks and arbitrary kernel memory write or code-execution primitives.\nA:H - The bug was reported to cause kernel panic during coredump VMA walks, and any UAF page fault on stale device-private pages can oops or panic the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": 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"references": [{"url": "https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89"}, {"url": "https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239"}, {"url": "https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0"}, {"url": "https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3"}, {"url": "https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1"}, {"url": "https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144"}], "title": "lib: test_hmm: evict device pages on file close to avoid use-after-free", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-46280", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:21:39.213026Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": 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there is no network, adjacent-wireless, or physical-device attack path.\nAC:L - The UAF is deterministically triggered by the attacker's own migrate-then-close-then-fault sequence with no race or external timing dependency; the attacker fully controls both sides of the lifecycle.\nPR:L - The vulnerable ioctl and release paths perform no capability or permission checks beyond opening the local character device; any local user who can access /dev/hmm_dmirrorN can execute the full exploit chain without real root privileges in the init namespace.\nUI:N - No victim interaction is required; the attacker triggers the fault themselves by accessing their own migrated pages or aborting for coredump after closing the device file.\nS:U - Impact is confined to kernel memory corruption and panic within the same kernel security boundary; this is a test-module UAF, not a VM escape, IOMMU bypass, or cross-authority sandbox breakout.\nC:H - The stale dmirror pointer is dereferenced in dmirror_devmem_fault() to read freed kmalloc memory (dmirror->mdevice, dmirror->flags), giving a classic UAF information-disclosure primitive.\nI:H - The fault handler continues to use the freed dmirror for migration and xa_erase on dmirror->pt, enabling heap reuse attacks and arbitrary kernel memory write or code-execution primitives.\nA:H - The bug was reported to cause kernel panic during coredump VMA walks, and any UAF page fault on stale device-private pages can oops or panic the system."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "234071b4318feaeb27cd2e4e1b16ef6b055adf89", "versionType": "git"}, {"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "bf477abd448c76bb8ea51c9b4f63a3a17c4b6239", "versionType": "git"}, {"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "5846715b6382dd4c6a69b35a56ca6115d33bc2a0", "versionType": "git"}, {"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "38f113f81d3f0adc658a4475dd3ecaec985e21d3", "versionType": "git"}, {"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1", "versionType": "git"}, {"status": "affected", "version": "b2ef9f5a5cb37643ca5def3516c546457074b882", "lessThan": "744dd97752ef1076a8d8672bb0d8aa2c7abc1144", "versionType": "git"}], "programFiles": ["lib/test_hmm.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"status": "unaffected", "version": "0", "lessThan": "5.8", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.140", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.86", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.27", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.4", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["lib/test_hmm.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89"}, {"url": "https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239"}, {"url": "https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0"}, {"url": "https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3"}, {"url": "https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1"}, {"url": "https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel selftests. These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first. This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg. during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct. The function is moved earlier\nin the file to avoid a forward declaration."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.140", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.86", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.27", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.4", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.8"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:01.052Z"}}}, "cveMetadata": {"cveId": "CVE-2026-46280", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:36:56.915Z", "dateReserved": "2026-05-13T15:03:33.110Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-06-08T15:41:23.095Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first. This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg. during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct. The function is moved earlier\nin the file to avoid a forward declaration."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlib: test_hmm: expulsar p\u00e1ginas de dispositivo al cerrar el archivo para evitar el uso despu\u00e9s de liberaci\u00f3n\n\nSerie de parches 'Correcciones y limpiezas menores de hmm_test'.\n\nDos correcciones de errores y una limpieza para las autopruebas del kernel HMM. Estos fueron reportados principalmente por Zenghui Yu con un agradecimiento especial a Lorenzo por analizar y se\u00f1alar los problemas.\n\nEste parche (de 3):\n\nCuando se llama a dmirror_fops_release(), libera la estructura dmirror pero no migra primero las p\u00e1ginas privadas del dispositivo de vuelta a la memoria del sistema. Esto deja esas p\u00e1ginas con un puntero zone_device_data colgante a la dmirror liberada.\n\nSi ocurre una falla posterior en esas p\u00e1ginas (por ejemplo, durante un coredump), la devoluci\u00f3n de llamada dmirror_devmem_fault() desreferencia el puntero obsoleto causando un p\u00e1nico del kernel. Esto fue reportado [1] al ejecutar mm/ksft_hmm.sh en arm64, donde una falla de prueba activ\u00f3 SIGABRT y el coredump resultante recorri\u00f3 las VMA causando fallas en las p\u00e1ginas privadas de dispositivo obsoletas.\n\nSolucione esto llamando a dmirror_device_evict_chunk() para cada fragmento de devmem en dmirror_fops_release() para migrar todas las p\u00e1ginas privadas del dispositivo de vuelta a la memoria del sistema antes de liberar la estructura dmirror. La funci\u00f3n se mueve antes en el archivo para evitar una declaraci\u00f3n anticipada."}], "id": "CVE-2026-46280", "lastModified": "2026-10-19T20:18:40.790", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46280", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:21:39.213026Z", "version": "2.0.3"}}]}, "published": "2026-06-08T17:16:45.683", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38f113f81d3f0adc658a4475dd3ecaec985e21d3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5846715b6382dd4c6a69b35a56ca6115d33bc2a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/744dd97752ef1076a8d8672bb0d8aa2c7abc1144"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf477abd448c76bb8ea51c9b4f63a3a17c4b6239"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: lib: test_hmm: evict device pages on file close to avoid use-after-free", "id": "2486449", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486449"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Heterogeneous Memory Management (HMM) test module. When a device mirror (dmirror) structure is freed, its associated device private pages are not properly migrated back to system memory. This can lead to a use-after-free condition where a dangling pointer to the freed dmirror is dereferenced, potentially causing a kernel panic. A local attacker could exploit this to trigger a denial of service."], "name": "CVE-2026-46280", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46280\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46280\nhttps://lore.kernel.org/linux-cve-announce/2026060841-CVE-2026-46280-13e3@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b2ef9f5a5cb37643ca5def3516c546457074b882,bf477abd448c76bb8ea51c9b4f63a3a17c4b6239)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b2ef9f5a5cb37643ca5def3516c546457074b882,5846715b6382dd4c6a69b35a56ca6115d33bc2a0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b2ef9f5a5cb37643ca5def3516c546457074b882,38f113f81d3f0adc658a4475dd3ecaec985e21d3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b2ef9f5a5cb37643ca5def3516c546457074b882,9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b2ef9f5a5cb37643ca5def3516c546457074b882,744dd97752ef1076a8d8672bb0d8aa2c7abc1144)"}}], "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": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.140,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.86,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-06-08T18:45:26.401115+00:00", "updated": "2026-08-12T04:30:04.390952+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}