GHSA-8536-V82H-GP8M
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31In the Linux kernel, the following vulnerability has been resolved:
kprobes: Protect kprobe_blacklist with RCU
__within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist() removes blacklist entries and immediately frees them with kfree(). A concurrent call to within_kprobe_blacklist() can therefore dereference freed memory.
Furthermore, within_kprobe_blacklist() can be called in atomic or non-preemptible contexts where the sleeping kprobe_mutex cannot be taken.
Protect kprobe_blacklist with RCU. Use guard(rcu)() and list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim entries safely after a grace period.
{
"affected": [],
"aliases": [
"CVE-2026-89988"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:17:09Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Protect kprobe_blacklist with RCU\n\n__within_kprobe_blacklist() traverses kprobe_blacklist without holding\nkprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist()\nremoves blacklist entries and immediately frees them with kfree().\nA concurrent call to within_kprobe_blacklist() can therefore dereference\nfreed memory.\n\nFurthermore, within_kprobe_blacklist() can be called in atomic or\nnon-preemptible contexts where the sleeping kprobe_mutex cannot be taken.\n\nProtect kprobe_blacklist with RCU. Use guard(rcu)() and\nlist_for_each_entry_rcu() for traversal, list_add_tail_rcu() for\ninsertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim\nentries safely after a grace period.",
"id": "GHSA-8536-v82h-gp8m",
"modified": "2026-09-16T15:31:04Z",
"published": "2026-09-16T12:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89988"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0c4256196b3a105307e2235fbfd85e768bbcdd0f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91ad"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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|---|
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