ghsa-vcqr-h4qj-jv8g
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drbd: Fix five use after free bugs in get_initial_state
In get_initial_state, it calls notify_initial_state_done(skb,..) if cb->args[5]==1. If genlmsg_put() failed in notify_initial_state_done(), the skb will be freed by nlmsg_free(skb). Then get_initial_state will goto out and the freed skb will be used by return value skb->len, which is a uaf bug.
What's worse, the same problem goes even further: skb can also be freed in the notify_state_change -> notify_state calls below. Thus 4 additional uaf bugs happened.
My patch lets the problem callee functions: notify_initial_state_done and notify_*_state_change return an error code if errors happen. So that the error codes could be propagated and the uaf bugs can be avoid.
v2 reports a compilation warning. This v3 fixed this warning and built successfully in my local environment with no additional warnings. v2: https://lore.kernel.org/patchwork/patch/1435218/
{
"affected": [],
"aliases": [
"CVE-2022-49085"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:00:45Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: Fix five use after free bugs in get_initial_state\n\nIn get_initial_state, it calls notify_initial_state_done(skb,..) if\ncb-\u003eargs[5]==1. If genlmsg_put() failed in notify_initial_state_done(),\nthe skb will be freed by nlmsg_free(skb).\nThen get_initial_state will goto out and the freed skb will be used by\nreturn value skb-\u003elen, which is a uaf bug.\n\nWhat\u0027s worse, the same problem goes even further: skb can also be\nfreed in the notify_*_state_change -\u003e notify_*_state calls below.\nThus 4 additional uaf bugs happened.\n\nMy patch lets the problem callee functions: notify_initial_state_done\nand notify_*_state_change return an error code if errors happen.\nSo that the error codes could be propagated and the uaf bugs can be avoid.\n\nv2 reports a compilation warning. This v3 fixed this warning and built\nsuccessfully in my local environment with no additional warnings.\nv2: https://lore.kernel.org/patchwork/patch/1435218/",
"id": "GHSA-vcqr-h4qj-jv8g",
"modified": "2025-02-27T18:31:08Z",
"published": "2025-02-27T18:31:08Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49085"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0489700bfeb1e53eb2039c2291c67e71b0b40103"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/188fe6b26765edbad4055611c0f788b6870f4024"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/226e993c39405292781bfcf4b039a8db56aab362"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/594205b4936771a250f9d141e7e0fff21c3dd2d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a972c768723359ec995579902473028fe3cd64b1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aadb22ba2f656581b2f733deb3a467c48cc618f6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b6a4055036eed1f5e239ce3d8b0db1ce38bba447"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dcf6be17b5c53b741898d2223b23e66d682de300"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/de63e74da2333b4068bb79983e632db730fea97e"
}
],
"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"
}
]
}
Sightings
| Author | Source | Type | Date |
|---|
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