GHSA-6XVC-M8WH-P8Q8
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
configfs: pin the symlink target's dirent instead of chasing ->ci_dentry
create_link() reads the target's configfs_dirent from item->ci_dentry->d_fsdata, relying on the item reference taken by get_target(). That reference pins the item, not its dentry: the dentry is pinned by DCACHE_PERSISTENT, which configfs_remove_dir() releases via simple_rmdir() while the item is still alive. A symlink racing with rmdir of its target can therefore find ->ci_dentry freed and its dirent released, triggering WARN_ON(!atomic_read(&sd->s_count)) in configfs_get().
Take the dirent in get_target() as well, under ->d_lock and atomically with the item reference, and pass it down to create_link(). A hashed dentry has not been killed yet, so its ->d_fsdata reference keeps the dirent alive there.
{
"affected": [],
"aliases": [
"CVE-2026-97950"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:22Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: pin the symlink target\u0027s dirent instead of chasing -\u003eci_dentry\n\ncreate_link() reads the target\u0027s configfs_dirent from\nitem-\u003eci_dentry-\u003ed_fsdata, relying on the item reference taken by\nget_target(). That reference pins the item, not its dentry: the dentry is\npinned by DCACHE_PERSISTENT, which configfs_remove_dir() releases via\nsimple_rmdir() while the item is still alive. A symlink racing with rmdir\nof its target can therefore find -\u003eci_dentry freed and its dirent\nreleased, triggering WARN_ON(!atomic_read(\u0026sd-\u003es_count)) in configfs_get().\n\nTake the dirent in get_target() as well, under -\u003ed_lock and atomically\nwith the item reference, and pass it down to create_link(). A hashed\ndentry has not been killed yet, so its -\u003ed_fsdata reference keeps the\ndirent alive there.",
"id": "GHSA-6xvc-m8wh-p8q8",
"modified": "2026-09-25T12:31:29Z",
"published": "2026-09-25T12:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-97950"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4f54beb2e7f6d399396466682fba3539bcdcb414"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a7c1290eef60711c10289c056ad32ed1f2b47b12"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d47c5de1cd6bfbe1067fc310bf90e4e00205e839"
}
],
"schema_version": "1.4.0",
"severity": []
}
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