In the Linux kernel, the following vulnerability has been resolved: cpufreq: pcc: fix use-after-free and double free in _OSC evaluation… (CVE-2026-64372)
A use-after-free and double free vulnerability in the Linux kernel's cpufreq pcc driver was resolved. The issue occurs during the two-phase _OSC negotiation where a buffer pointer is freed but the length is not reset, causing the second call to write into freed memory and subsequently free the pointer again. This could lead to memory corruption.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel cpufreq pcc driver involves improper handling of the output buffer during the _OSC evaluation. The function pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for negotiation, freeing the output.pointer after the first call but not resetting output.length. Because output.length remains non-zero, the second call writes into freed memory (use-after-free), and the pointer is freed a second time (double free). The fix resets output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after the first free, ensuring fresh buffer allocation for each call.
Potential Impact
This vulnerability can cause memory corruption in the kernel due to use-after-free and double free conditions. Such memory corruption could potentially lead to system instability or crashes. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor vendor communications for updates. No specific workaround is provided in the available data.
In the Linux kernel, the following vulnerability has been resolved: cpufreq: pcc: fix use-after-free and double free in _OSC evaluation… (CVE-2026-64372)
Description
A use-after-free and double free vulnerability in the Linux kernel's cpufreq pcc driver was resolved. The issue occurs during the two-phase _OSC negotiation where a buffer pointer is freed but the length is not reset, causing the second call to write into freed memory and subsequently free the pointer again. This could lead to memory corruption.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel cpufreq pcc driver involves improper handling of the output buffer during the _OSC evaluation. The function pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for negotiation, freeing the output.pointer after the first call but not resetting output.length. Because output.length remains non-zero, the second call writes into freed memory (use-after-free), and the pointer is freed a second time (double free). The fix resets output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after the first free, ensuring fresh buffer allocation for each call.
Potential Impact
This vulnerability can cause memory corruption in the kernel due to use-after-free and double free conditions. Such memory corruption could potentially lead to system instability or crashes. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor vendor communications for updates. No specific workaround is provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-987r-r7fx-f5cm
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64372"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420b9c2644c7f8084a3f
Added to database: 07/25/2026, 23:08:59 UTC
Last enriched: 07/25/2026, 23:29:43 UTC
Last updated: 07/26/2026, 03:42:29 UTC
Views: 4
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