CVE-2025-38131 — linux / linux_kernel
Use After FreeIn the Linux kernel, the following vulnerability has been resolved:
coresight: prevent deactivate active config while enabling the config
While enable active config via cscfg_csdev_enable_active_config(), active config could be deactivated via configfs' sysfs interface. This could make UAF issue in below scenario:
CPU0 CPU1 (sysfs enable) load module cscfg_load_config_sets() activate config. // sysfs (sys_active_cnt == 1) ... cscfg_csdev_enable_active_config() lock(csdev->cscfg_csdev_lock) // here load config activate by CPU1 unlock(csdev->cscfg_csdev_lock)
deactivate config // sysfs
(sys_activec_cnt == 0)
cscfg_unload_config_sets()
unload module
// access to config_desc which freed // while unloading module. cscfg_csdev_enable_config
To address this, use cscfg_config_desc's active_cnt as a reference count which will be holded when - activate the config. - enable the activated config. and put the module reference when config_active_cnt == 0.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 5.15 | 6.1.142 |
| linux / linux_kernel | 6.2 | 6.6.94 |
| linux / linux_kernel | 6.7 | 6.12.34 |
| linux / linux_kernel | 6.13 | 6.15.3 |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/31028812724cef7bd57a51525ce58a32a6d73b22
- https://git.kernel.org/stable/c/408c97c4a5e0b634dcd15bf8b8808b382e888164
- https://git.kernel.org/stable/c/b3b4efa2e623aecaebd7c9b9e4171f5c659e9724
- https://git.kernel.org/stable/c/dfe8224c9c7a43d356eb9f74b06868aa05f90223
- https://git.kernel.org/stable/c/ed42ee1ed05ff2f4c36938379057413a40c56680
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.
CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.
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Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.
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