ghsa-m7wf-2qxg-448x
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
kprobes: Fix possible use-after-free issue on kprobe registration
When unloading a module, its state is changing MODULE_STATE_LIVE ->
MODULE_STATE_GOING -> MODULE_STATE_UNFORMED. Each change will take
a time. is_module_text_address() and __module_text_address()
works with MODULE_STATE_LIVE and MODULE_STATE_GOING.
If we use is_module_text_address() and __module_text_address()
separately, there is a chance that the first one is succeeded but the
next one is failed because module->state becomes MODULE_STATE_UNFORMED
between those operations.
In check_kprobe_address_safe(), if the second __module_text_address()
is failed, that is ignored because it expected a kernel_text address.
But it may have failed simply because module->state has been changed
to MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify
non-exist module text address (use-after-free).
To fix this problem, we should not use separated is_module_text_address()
and __module_text_address(), but use only __module_text_address()
once and do try_module_get(module) which is only available with
MODULE_STATE_LIVE.
{
"affected": [],
"aliases": [
"CVE-2024-35955"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-20T10:15:10Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Fix possible use-after-free issue on kprobe registration\n\nWhen unloading a module, its state is changing MODULE_STATE_LIVE -\u003e\n MODULE_STATE_GOING -\u003e MODULE_STATE_UNFORMED. Each change will take\na time. `is_module_text_address()` and `__module_text_address()`\nworks with MODULE_STATE_LIVE and MODULE_STATE_GOING.\nIf we use `is_module_text_address()` and `__module_text_address()`\nseparately, there is a chance that the first one is succeeded but the\nnext one is failed because module-\u003estate becomes MODULE_STATE_UNFORMED\nbetween those operations.\n\nIn `check_kprobe_address_safe()`, if the second `__module_text_address()`\nis failed, that is ignored because it expected a kernel_text address.\nBut it may have failed simply because module-\u003estate has been changed\nto MODULE_STATE_UNFORMED. In this case, arm_kprobe() will try to modify\nnon-exist module text address (use-after-free).\n\nTo fix this problem, we should not use separated `is_module_text_address()`\nand `__module_text_address()`, but use only `__module_text_address()`\nonce and do `try_module_get(module)` which is only available with\nMODULE_STATE_LIVE.",
"id": "GHSA-m7wf-2qxg-448x",
"modified": "2024-07-03T18:42:36Z",
"published": "2024-05-20T12:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35955"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2df2dd27066cdba8041e46a64362325626bdfb2e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/325f3fb551f8cd672dbbfc4cf58b14f9ee3fc9e8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/36b57c7d2f8b7de224980f1a284432846ad71ca0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5062d1f4f07facbdade0f402d9a04a788f52e26d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/62029bc9ff2c17a4e3a2478d83418ec575413808"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/93eb31e7c3399e326259f2caa17be1e821f5a412"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b5808d40093403334d939e2c3c417144d12a6f33"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d15023fb407337028a654237d8968fefdcf87c2f"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}