CVE-2025-39871 Vulnerability Analysis & Exploit Details

CVE-2025-39871
Vulnerability Scoring

7.8
/10
Very High Risk

Highly exploitable, CVE-2025-39871 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2025-39871 Details

Status: Analyzed

Last updated: 🕖 12 Dec 2025, 19:01 UTC
Originally published on: 🕕 23 Sep 2025, 06:15 UTC

Time between publication and last update: 80 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2025-39871 Vulnerability Summary

CVE-2025-39871: In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: Remove improper idxd_free The call to idxd_free() introduces a duplicate put_device() leading to a reference count underflow: refcount_t: underflow; use-after-free. WARNING: CPU: 15 PID: 4428 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110 ... Call Trace: <TASK> idxd_remove+0xe4/0x120 [idxd] pci_device_remove+0x3f/0xb0 device_release_driver_internal+0x197/0x200 driver_detach+0x48/0x90 bus_remove_driver+0x74/0xf0 pci_unregister_driver+0x2e/0xb0 idxd_exit_module+0x34/0x7a0 [idxd] __do_sys_delete_module.constprop.0+0x183/0x280 do_syscall_64+0x54/0xd70 entry_SYSCALL_64_after_hwframe+0x76/0x7e The idxd_unregister_devices() which is invoked at the very beginning of idxd_remove(), already takes care of the necessary put_device() through the following call path: idxd_unregister_devices() -> device_unregister() -> put_device() In addition, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device() may trigger asynchronous cleanup via schedule_delayed_work(). If idxd_free() is called immediately after, it can result in a use-after-free. Remove the improper idxd_free() to avoid both the refcount underflow and potential memory corruption during module unload.

Assessing the Risk of CVE-2025-39871

Access Complexity Graph

The exploitability of CVE-2025-39871 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2025-39871

CVE-2025-39871 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2025-39871, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2025-39871, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2025-39871 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2025-39871 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2025-39871 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2025-39871 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:6.1.140:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.140:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.141:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.141:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.142:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.142:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.143:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.143:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.144:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.144:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.145:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.145:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.146:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.146:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.147:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.147:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.148:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.148:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.149:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.149:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.150:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.150:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.151:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.151:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.152:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.152:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.153:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.153:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.154:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.154:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.155:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.155:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.156:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.156:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.157:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.157:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.1.158:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.1.158:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.92:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.92:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.93:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.93:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.94:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.94:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.95:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.95:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.96:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.96:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.97:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.97:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.98:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.98:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.99:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.99:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.100:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.100:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.101:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.101:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.102:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.102:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.103:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.103:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.104:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.104:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.105:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.105:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.6.106:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.6.106:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.30:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.30:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.31:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.31:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.32:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.32:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.33:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.33:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.34:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.34:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.35:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.35:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.36:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.36:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.37:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.37:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.38:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.38:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.39:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.39:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.40:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.40:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.41:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.41:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.42:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.42:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.43:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.43:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.44:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.44:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.45:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.45:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.46:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.46:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.12.47:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.12.47:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.14:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.4:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15.10:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15.11:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.16:-:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.16.1:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.16.2:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.16.3:*:*:*:*:*:*:*
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  • cpe:2.3:o:linux:linux_kernel:6.16.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.16.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.16.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*

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