CVE-2025-38421

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38421", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.014Z", "datePublished": "2025-07-25T14:16:42.409Z", "dateUpdated": "2026-10-21T12:37:04.677Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:37:04.677Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd: pmf: Use device managed allocations\n\nIf setting up smart PC fails for any reason then this can lead to\na double free when unloading amd-pmf. This is because dev->buf was\nfreed but never set to NULL and is again freed in amd_pmf_remove().\n\nTo avoid subtle allocation bugs in failures leading to a double free\nchange all allocations into device managed allocations."}], "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 amd-pmf platform driver is reachable only from the local machine \u2014 via driver unbind/module unload, the suspend/resume PM path, or the debugfs `update_policy` handler. There is no network or adjacent-network exposure.\nAC:L - On an affected system (AMD laptop whose BIOS advertises Smart PC while the PMF TA/policy is unavailable) `amd_pmf_init_smart_pc()` fails deterministically at every boot, leaving `dev->buf`, `dev->policy_buf` and `dev->prev_data` dangling, so the attacker simply triggers unbind or a suspend/resume cycle to hit the double free/UAF with 100% reliability.\nPR:L - The dangling `pdev->buf` is dereferenced from `amd_pmf_resume_handler()`/`amd_pmf_restore_handler()` and from the re-armed `pb_work` handler, and an unprivileged local user in an active session can initiate suspend/resume through logind; heap grooming to control the reused slab object also needs only unprivileged allocations.\nUI:N - The attacker performs the triggering action themselves (driver unbind/module unload or a suspend/resume cycle); no separate victim needs to be induced into any action.\nS:U - The corrupted memory and the resulting privilege escalation are entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `dev->buf`/`dev->prev_data` pointers are read after free (`memcpy(&dev->m_table, dev->buf, dev->mtable_size)` in `amd_pmf_get_smu_info()`), leaking reallocated kernel slab contents, and the double free gives the attacker a slab object shared with another subsystem, which is a general kernel-memory read primitive.\nI:H - The double free of `dev->buf` (and of `policy_buf`/`prev_data`) lets the same slab object be handed to two owners, and the UAF write paths (`memset(dev->buf, 0, dev->mtable_size)`, `dev->prev_data->spl = val`, plus SMU DMA into the freed page programmed by `amd_pmf_set_dram_addr()`) provide a controlled write into live kernel objects, which is exploitable for control-flow hijack.\nA:H - A double free triggers immediate slab freelist corruption \u2014 a BUG/panic under freelist hardening or CONFIG_SLUB_DEBUG, and unbounded heap corruption leading to a crash otherwise; the UAF accesses from the PM resume path can be repeated to reliably crash the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/platform/x86/amd/pmf/core.c", "drivers/platform/x86/amd/pmf/tee-if.c"], "versions": [{"version": "e70b4b8f93d7fcf8ee063a1d1f18782c4da3d335", "lessThan": "d6a38e1a82d2f9abd0bae84a354654bccb8389f6", "status": "affected", "versionType": "git"}, {"version": "5b1122fc4995f308b21d7cfc64ef9880ac834d20", "lessThan": "0d10b532f861253c283863522d59d099fcb0796d", "status": "affected", "versionType": "git"}, {"version": "5b1122fc4995f308b21d7cfc64ef9880ac834d20", "lessThan": "d9db3a941270d92bbd1a6a6b54a10324484f2f2d", "status": "affected", "versionType": "git"}, {"version": "3ed60e51ffdbfef14169bd967e21a6ba5e5ff42b", "status": "affected", "versionType": "git"}, {"version": "6.12.23", "lessThan": "6.12.114", "status": "affected", "versionType": "semver"}, {"version": "6.13.11", "lessThan": "6.14", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/platform/x86/amd/pmf/core.c", "drivers/platform/x86/amd/pmf/tee-if.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.4", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "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": "6.12.23", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.15.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d6a38e1a82d2f9abd0bae84a354654bccb8389f6"}, {"url": "https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d"}, {"url": "https://git.kernel.org/stable/c/d9db3a941270d92bbd1a6a6b54a10324484f2f2d"}], "title": "platform/x86/amd: pmf: Use device managed allocations", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/platform/x86/amd/pmf/core.c", "drivers/platform/x86/amd/pmf/tee-if.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d6a38e1a82d2f9abd0bae84a354654bccb8389f6", "status": "affected", "version": "e70b4b8f93d7fcf8ee063a1d1f18782c4da3d335", "versionType": "git"}, {"lessThan": "0d10b532f861253c283863522d59d099fcb0796d", "status": "affected", "version": "5b1122fc4995f308b21d7cfc64ef9880ac834d20", "versionType": "git"}, {"lessThan": "d9db3a941270d92bbd1a6a6b54a10324484f2f2d", "status": "affected", "version": "5b1122fc4995f308b21d7cfc64ef9880ac834d20", "versionType": "git"}, {"status": "affected", "version": "3ed60e51ffdbfef14169bd967e21a6ba5e5ff42b", "versionType": "git"}, {"lessThan": "6.12.114", "status": "affected", "version": "6.12.23", "versionType": "semver"}, {"lessThan": "6.14", "status": "affected", "version": "6.13.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/platform/x86/amd/pmf/core.c", "drivers/platform/x86/amd/pmf/tee-if.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.15.*", "status": "unaffected", "version": "6.15.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "50F52A53-697C-4085-B8FE-105DE882578F", "versionEndExcluding": "6.13", "versionStartIncluding": "6.12.23", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "124AE182-7E9F-4410-9E08-5976ED49C6A4", "versionEndExcluding": "6.14", "versionStartIncluding": "6.13.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A43298F2-A0DE-4797-B4E4-14DE5F4D5EED", "versionEndExcluding": "6.15.4", "versionStartIncluding": "6.14.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:-:*:*:*:*:*:*", "matchCriteriaId": "7DE421BA-0600-4401-A175-73CAB6A6FB4E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:*", "matchCriteriaId": "AD948719-8628-4421-A340-1066314BBD4A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc2:*:*:*:*:*:*", "matchCriteriaId": "09709862-E348-4378-8632-5A7813EDDC86", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86/amd: pmf: Use device managed allocations\n\nIf setting up smart PC fails for any reason then this can lead to\na double free when unloading amd-pmf. This is because dev->buf was\nfreed but never set to NULL and is again freed in amd_pmf_remove().\n\nTo avoid subtle allocation bugs in failures leading to a double free\nchange all allocations into device managed allocations."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: platform/x86/amd: pmf: Usar asignaciones administradas por dispositivo. Si la configuraci\u00f3n de Smart PC falla por cualquier motivo, esto puede provocar una doble liberaci\u00f3n al descargar amd-pmf. Esto se debe a que dev->buf se liber\u00f3, pero nunca se configur\u00f3 como NULL y se libera de nuevo en amd_pmf_remove(). Para evitar errores sutiles de asignaci\u00f3n en fallos que provoquen una doble liberaci\u00f3n, cambie todas las asignaciones a asignaciones administradas por dispositivo."}], "id": "CVE-2025-38421", "lastModified": "2026-10-21T13:18:11.537", "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": 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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-25T15:15:26.927", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6a38e1a82d2f9abd0bae84a354654bccb8389f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d9db3a941270d92bbd1a6a6b54a10324484f2f2d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: platform/x86/amd: pmf: Use device managed allocations", "id": "2383457", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383457"}, "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:\nplatform/x86/amd: pmf: Use device managed allocations\nIf setting up smart PC fails for any reason then this can lead to\na double free when unloading amd-pmf. This is because dev->buf was\nfreed but never set to NULL and is again freed in amd_pmf_remove().\nTo avoid subtle allocation bugs in failures leading to a double free\nchange all allocations into device managed allocations."], "name": "CVE-2025-38421", "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": "2025-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38421\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38421\nhttps://lore.kernel.org/linux-cve-announce/2025072554-CVE-2025-38421-8601@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-26T12:07:38.152639+00:00", "updated": "2025-07-26T12:07:38.152709+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}