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CVE-2026-64372

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 8e454e9d0bc03446d610ee49abec9dfd424f6541; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 632666a63116d8061c62a988d1ca39dcd6d27c9b; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 5cdb25f144b101083d8bf3fd023ad87fbe6850d7; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 982c9f92d57bda2b769851ff6d90d43dcf5f3734; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in a36ca93a8ba57464e521d70a337d37f069064111; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29; From 0f1d683fb35d6c6f49ef696c95757f3970682a0e · fixed in 266d3dd8b757b48a576e90f018b51f7b7563cc32

  • Linux Linux

    2.6.34

  • KernelLinux

    From 2.6.34 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.96; From 6.13.0 · fixed in 6.18.39; From 6.19.0 · fixed in 7.1.4

References 8

git.kernel.org