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CVE-2026-64372— cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于cpufreq pcc驱动在OSC评估中释放指针后未重置长度，导致释放后重用和双重释放。

CVSS 7.8 · High EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0f1d683fb35d6c6f49ef696c95757f3970682a0e< 8e454e9d0bc03446d610ee49abec9dfd424f6541 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 632666a63116d8061c62a988d1ca39dcd6d27c9b affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 5cdb25f144b101083d8bf3fd023ad87fbe6850d7 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 982c9f92d57bda2b769851ff6d90d43dcf5f3734 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< a36ca93a8ba57464e521d70a337d37f069064111 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29 affected
0f1d683fb35d6c6f49ef696c95757f3970682a0e< 266d3dd8b757b48a576e90f018b51f7b7563cc32 affected
… +10 more rows
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I. Basic Information for CVE-2026-64372

Vulnerability Information
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Vulnerability Title
cpufreq: pcc: fix use-after-free and double free in _OSC evaluation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于cpufreq pcc驱动在OSC评估中释放指针后未重置长度，导致释放后重用和双重释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0f1d683fb35d6c6f49ef696c95757f3970682a0e ~ 8e454e9d0bc03446d610ee49abec9dfd424f6541 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-64372

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III. Intelligence Information for CVE-2026-64372

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Patches & Fixes for CVE-2026-64372 (8)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials
CVE-2026-64392 9.1 CRITICAL ksmbd: use opener credentials for delete-on-close
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64450 9.1 CRITICAL tipc: fix out-of-bounds read in broadcast Gap ACK blocks

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64372

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