Vulnerability details
CVE-2026-64372
cpufreq: pcc: fix use-after-free and double free in _OSC evaluation
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 2.6.34 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 632666a63116d8061c62a988d1ca39dcd6d27c9b | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 5cdb25f144b101083d8bf3fd023ad87fbe6850d7 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 982c9f92d57bda2b769851ff6d90d43dcf5f3734 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 8e454e9d0bc03446d610ee49abec9dfd424f6541 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < 266d3dd8b757b48a576e90f018b51f7b7563cc32 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 0f1d683fb35d6c6f49ef696c95757f3970682a0e ≤ v < a36ca93a8ba57464e521d70a337d37f069064111 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541
- https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b
- https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7
- https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734
- https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111
- https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7
- https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29
- https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32
Details
- Published
- 2026-07-25
- Last updated
- 2026-10-20
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-416Use After Free