PT-2026-64593 · Linux · Linux

CVE-2026-64372 · Published 2026-07-25 · Updated 2026-07-25

Mitre

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.

Related Identifiers

CVE-2026-64372

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-64372 · Security Note
• https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734 · Note
• https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 · Note
• https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111 · Note
• https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541 · Note
• https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32 · Note
• https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b · Note
• https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 · Note
• https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7 · Note