GHSA-VWFX-985H-JQVX
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
ring-buffer: Check resize_disabled before publishing the new subbuf order
ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA.
Check the CPUs before storing the new order.
{
"affected": [],
"aliases": [
"CVE-2026-97617"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:15Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Check resize_disabled before publishing the new subbuf order\n\nring_buffer_subbuf_order_set() stores the new order and only then walks\nthe CPUs, returning -EBUSY if any of them has resizing disabled. A user\nmapped buffer has resizing disabled, and __rb_map_vma() reads\nbuffer-\u003esubbuf_order without buffer-\u003emutex, so an mmap of an already\nmapped CPU racing the failing order change sizes the mapping with the\nnew order and inserts pages past the sub-buffer into the VMA.\n\nCheck the CPUs before storing the new order.",
"id": "GHSA-vwfx-985h-jqvx",
"modified": "2026-09-25T12:31:27Z",
"published": "2026-09-25T12:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97617"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/32bf47db9237c5b8b6f6aaa5356bb4c79d241f76"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d860c67c051685abb0460b593b193f0f45f4fa92"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f2099644e1b2a2c0805c5240d63ab0522d9d0174"
}
],
"schema_version": "1.4.0",
"severity": []
}
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