{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64372", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.783Z", "datePublished": "2026-07-25T08:50:24.733Z", "dateUpdated": "2026-08-17T04:54:22.197Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:54:22.197Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: pcc: fix use-after-free and double free in _OSC evaluation\n\npcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the\ntwo-phase _OSC negotiation. Between the two calls it freed\noutput.pointer but left output.length unchanged. Since\nacpi_evaluate_object() treats a non-zero length with a non-NULL\npointer as an existing buffer to write into, the second call wrote\ninto freed memory (use-after-free). The subsequent kfree(output.pointer)\nat out_free then freed the same pointer a second time (double free).\n\nReset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER\nafter freeing the first result, so ACPICA allocates a fresh buffer for\neach phase independently." } ], "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 flaw is reached during local initialization of the x86 PCC cpufreq driver on systems exposing the required ACPI PCC objects; no network, radio, or hot-plug input reaches this path.\nAC:L - Once two-phase _OSC negotiation succeeds, the stale-buffer write and subsequent double free occur deterministically without a race or other condition beyond attacker influence.\nPR:L - PCC platform-device creation and driver probing can occur automatically during boot or module autoload, leaving exploitable heap corruption without the attacker needing CAP_SYS_MODULE. A basic local user can groom and consume the resulting overlapping or corrupted slab objects.\nUI:N - The vulnerable driver probe and _OSC negotiation occur automatically and require no victim action.\nS:U - The corruption affects the host kernel within the same security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free and double free can produce overlapping kernel heap objects, enabling disclosure of arbitrary kernel memory.\nI:H - The freed-object write and allocator freelist corruption can enable arbitrary kernel-memory modification and control-flow hijacking.\nA:H - Hardened allocators may immediately detect the double free and stop the kernel, while other configurations can crash or panic from the corrupted slab freelist." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/cpufreq/pcc-cpufreq.c" ], "versions": [ { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "8e454e9d0bc03446d610ee49abec9dfd424f6541", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "632666a63116d8061c62a988d1ca39dcd6d27c9b", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "5cdb25f144b101083d8bf3fd023ad87fbe6850d7", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "982c9f92d57bda2b769851ff6d90d43dcf5f3734", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "a36ca93a8ba57464e521d70a337d37f069064111", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29", "status": "affected", "versionType": "git" }, { "version": "0f1d683fb35d6c6f49ef696c95757f3970682a0e", "lessThan": "266d3dd8b757b48a576e90f018b51f7b7563cc32", "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/cpufreq/pcc-cpufreq.c" ], "versions": [ { "version": "2.6.34", "status": "affected" }, { "version": "0", "lessThan": "2.6.34", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "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": "2.6.34", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.12.96" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "6.18.39" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541" }, { "url": "https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b" }, { "url": "https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7" }, { "url": "https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734" }, { "url": "https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111" }, { "url": "https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7" }, { "url": "https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29" }, { "url": "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32" } ], "title": "cpufreq: pcc: fix use-after-free and double free in _OSC evaluation", "x_generator": { "engine": "bippy-1.2.0" } } } }