Description
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 products
linux: linux kernel
References8
- git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 Patch
- git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32 Patch
- git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7 Patch
- git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b Patch
- git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 Patch
- git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541 Patch
- git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734 Patch
- git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111 Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 2 · as of 14 November 2026
- CWE
- CWE-416
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