ghsa-px9x-jp5p-m4g4
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
alloc_tag: allocate percpu counters for module tags dynamically
When a module gets unloaded it checks whether any of its tags are still in use and if so, we keep the memory containing module's allocation tags alive until all tags are unused. However percpu counters referenced by the tags are freed by free_module(). This will lead to UAF if the memory allocated by a module is accessed after module was unloaded.
To fix this we allocate percpu counters for module allocation tags dynamically and we keep it alive for tags which are still in use after module unloading. This also removes the requirement of a larger PERCPU_MODULE_RESERVE when memory allocation profiling is enabled because percpu memory for counters does not need to be reserved anymore.
{
"affected": [],
"aliases": [
"CVE-2025-38076"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T10:15:41Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nalloc_tag: allocate percpu counters for module tags dynamically\n\nWhen a module gets unloaded it checks whether any of its tags are still in\nuse and if so, we keep the memory containing module\u0027s allocation tags\nalive until all tags are unused. However percpu counters referenced by\nthe tags are freed by free_module(). This will lead to UAF if the memory\nallocated by a module is accessed after module was unloaded.\n\nTo fix this we allocate percpu counters for module allocation tags\ndynamically and we keep it alive for tags which are still in use after\nmodule unloading. This also removes the requirement of a larger\nPERCPU_MODULE_RESERVE when memory allocation profiling is enabled because\npercpu memory for counters does not need to be reserved anymore.",
"id": "GHSA-px9x-jp5p-m4g4",
"modified": "2025-06-18T12:30:34Z",
"published": "2025-06-18T12:30:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38076"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/12ca42c237756182aad8ab04654c952765cb9061"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3cc733e6d96c938d2b82be96858a0ab900eb6fdc"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
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