CVE-2026-64372

Summary

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the two-phase _OSC negotiation. Between the two calls it freed output.pointer but left output.length unchanged. Since acpi_evaluate_object() treats a non-zero length with a non-NULL pointer as an existing buffer to write into, the second call wrote into freed memory (use-after-free). The subsequent kfree(output.pointer) at out_free then freed the same pointer a second time (double free).

Reset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after freeing the first result, so ACPICA allocates a fresh buffer for each phase independently.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 8e454e9d0bc03446d610ee49abec9dfd424f6541affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 632666a63116d8061c62a988d1ca39dcd6d27c9baffected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 5cdb25f144b101083d8bf3fd023ad87fbe6850d7affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 982c9f92d57bda2b769851ff6d90d43dcf5f3734affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < a36ca93a8ba57464e521d70a337d37f069064111affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29affected
LinuxLinux0f1d683fb35d6c6f49ef696c95757f3970682a0e < 266d3dd8b757b48a576e90f018b51f7b7563cc32affected
LinuxLinux2.6.34affected
LinuxLinux0 < 2.6.34unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.96 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References