GHSA-VPQC-5PHG-HJVG
Vulnerability from github – Published: 2025-03-10 21:31 – Updated: 2025-03-10 21:31In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't null dereference ops->destroy
A KVM device cleanup happens in either of two callbacks: 1) destroy() which is called when the VM is being destroyed; 2) release() which is called when a device fd is closed.
Most KVM devices use 1) but Book3s's interrupt controller KVM devices (XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during the machine execution. The error handling in kvm_ioctl_create_device() assumes destroy() is always defined which leads to NULL dereference as discovered by Syzkaller.
This adds a checks for destroy!=NULL and adds a missing release().
This is not changing kvm_destroy_devices() as devices with defined release() should have been removed from the KVM devices list by then.
{
"affected": [],
"aliases": [
"CVE-2022-49568"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T07:01:32Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: Don\u0027t null dereference ops-\u003edestroy\n\nA KVM device cleanup happens in either of two callbacks:\n1) destroy() which is called when the VM is being destroyed;\n2) release() which is called when a device fd is closed.\n\nMost KVM devices use 1) but Book3s\u0027s interrupt controller KVM devices\n(XICS, XIVE, XIVE-native) use 2) as they need to close and reopen during\nthe machine execution. The error handling in kvm_ioctl_create_device()\nassumes destroy() is always defined which leads to NULL dereference as\ndiscovered by Syzkaller.\n\nThis adds a checks for destroy!=NULL and adds a missing release().\n\nThis is not changing kvm_destroy_devices() as devices with defined\nrelease() should have been removed from the KVM devices list by then.",
"id": "GHSA-vpqc-5phg-hjvg",
"modified": "2025-03-10T21:31:10Z",
"published": "2025-03-10T21:31:10Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49568"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/170465715a60cbb7876e6b961b21bd3225469da8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3616776bc51cd3262bb1be60cc01c72e0a1959cf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d4a5a79b780891c5cbdfdc6124d46fdf8d13dba1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e8bc2427018826e02add7b0ed0fc625a60390ae5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e91665fbbf3ccb268b268a7d71a6513538d813ac"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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