CVE-2025-39906

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No network or physical access is needed to touch the freed object.\nAC:L - There is no race window: once `dm_hw_fini()` runs, the dangling idr entry, sysfs nodes and `/dev/i2c-N` persist indefinitely, so the attacker triggers the UAF deterministically and repeatedly at a time of their choosing. Driver unbind/module reload is a routine event (driver upgrade, DKMS, VFIO rebind, eGPU unplug) and is directly attacker-initiated where the attacker holds those rights.\nPR:L - Any local unprivileged account can dereference the freed adapter \u2014 `/sys/class/i2c-adapter/i2c-N/name` is world-readable 0444 and reads straight out of the freed allocation, and on the desktops that actually expose this OEM bus (board/RGB control) `/dev/i2c-*` is granted to non-root users by the vendor udev rules, giving the full `I2C_RDWR` path.\nUI:N - No victim action is required at exploitation time; the corrupted state is permanent after the driver teardown, so the attacker simply opens the stale device or reads the stale sysfs attribute on their own schedule.\nS:U - The freed object and all consequences (kernel heap corruption, kernel-mode code execution) are within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Reading the still-registered adapter's world-readable sysfs attributes returns bytes from a freed slab object, and reclaiming the allocation lets the attacker read back attacker-chosen or victim-owned kernel heap contents \u2014 an arbitrary kernel-memory read primitive, not a bounded leak.\nI:H - The freed `struct i2c_adapter` is still dereferenced for its `algo->master_xfer` and `lock_ops` function-pointer tables on every transfer, and for `get_device()`/`put_device()` refcount and klist operations; spraying the reclaimed slab yields control-flow hijack and list-corruption write primitives, i.e. full kernel compromise.\nA:H - The commit itself documents an oops (\"null pointer dereference when applications try to access the invalid device\"); dereferencing the freed adapter and its dangling `ddc_service`/`dc` chain reliably panics the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c"], "versions": [{"version": "3d5470c973149f479572dcf4eea064775041ea6c", "lessThan": "c686124bcf06253620790857ff462f00f3f7a4ab", "status": "affected", "versionType": "git"}, {"version": "3d5470c973149f479572dcf4eea064775041ea6c", "lessThan": "1dfd2864a1c4909147663e5a27c055f50f7c2796", "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/amd/display/amdgpu_dm/amdgpu_dm.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.8", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.15", "versionEndExcluding": "6.16.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c686124bcf06253620790857ff462f00f3f7a4ab"}, {"url": "https://git.kernel.org/stable/c/1dfd2864a1c4909147663e5a27c055f50f7c2796"}], "title": "drm/amd/display: remove oem i2c adapter on finish", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2025-39906", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T19:30:44.445529Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T19:33:14.971Z"}}]}}

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"340BEEA9-D70D-4290-B502-FBB1032353B1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: remove oem i2c adapter on finish\n\nFixes a bug where unbinding of the GPU would leave the oem i2c adapter\nregistered resulting in a null pointer dereference when applications try\nto access the invalid device.\n\n(cherry picked from commit 89923fb7ead4fdd37b78dd49962d9bb5892403e6)"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/amd/display: eliminar el adaptador i2c OEM al finalizar\n\nCorrige un error donde la desvinculaci\u00f3n de la GPU dejar\u00eda el adaptador i2c OEM registrado, lo que resultar\u00eda en una desreferencia de puntero nulo cuando las aplicaciones intentan acceder al dispositivo inv\u00e1lido.\n\n(seleccionado del commit 89923fb7ead4fdd37b78dd49962d9bb5892403e6)"}], "id": "CVE-2025-39906", "lastModified": "2026-10-19T21:10:00.160", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", 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{"bugzilla": {"description": "kernel: drm/amd/display: remove oem i2c adapter on finish", "id": "2400617", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400617"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amd/display: remove oem i2c adapter on finish\nFixes a bug where unbinding of the GPU would leave the oem i2c adapter\nregistered resulting in a null pointer dereference when applications try\nto access the invalid device.\n(cherry picked from commit 89923fb7ead4fdd37b78dd49962d9bb5892403e6)"], "name": "CVE-2025-39906", "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"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39906\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39906\nhttps://lore.kernel.org/linux-cve-announce/2025100108-CVE-2025-39906-5913@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-02T08:40:15.727015+00:00", "updated": "2025-10-02T08:40:15.727076+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}