ghsa-2jgx-99cr-362f
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free:
Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)
WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0
Modules linked in: testKprobe_007(-)
CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18
[...]
Call Trace:
For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.
{
"affected": [],
"aliases": [
"CVE-2022-49779"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-05-01T15:16:01Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case\n\nIn __unregister_kprobe_top(), if the currently unregistered probe has\npost_handler but other child probes of the aggrprobe do not have\npost_handler, the post_handler of the aggrprobe is cleared. If this is\na ftrace-based probe, there is a problem. In later calls to\ndisarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is\nNULL. But we\u0027re armed with kprobe_ipmodify_ops. This triggers a WARN in\n__disarm_kprobe_ftrace() and may even cause use-after-free:\n\n Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)\n WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0\n Modules linked in: testKprobe_007(-)\n CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18\n [...]\n Call Trace:\n \u003cTASK\u003e\n __disable_kprobe+0xcd/0xe0\n __unregister_kprobe_top+0x12/0x150\n ? mutex_lock+0xe/0x30\n unregister_kprobes.part.23+0x31/0xa0\n unregister_kprobe+0x32/0x40\n __x64_sys_delete_module+0x15e/0x260\n ? do_user_addr_fault+0x2cd/0x6b0\n do_syscall_64+0x3a/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n\nFor the kprobe-on-ftrace case, we keep the post_handler setting to\nidentify this aggrprobe armed with kprobe_ipmodify_ops. This way we\ncan disarm it correctly.",
"id": "GHSA-2jgx-99cr-362f",
"modified": "2025-05-01T15:31:46Z",
"published": "2025-05-01T15:31:46Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49779"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4"
}
],
"schema_version": "1.4.0",
"severity": []
}
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.