GHSA-J7XM-PF76-QWW8
Vulnerability from github – Published: 2024-05-21 18:31 – Updated: 2024-10-31 18:31In the Linux kernel, the following vulnerability has been resolved:
scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool
In practice the driver should never send more commands than are allocated to a queue's event pool. In the unlikely event that this happens, the code asserts a BUG_ON, and in the case that the kernel is not configured to crash on panic returns a junk event pointer from the empty event list causing things to spiral from there. This BUG_ON is a historical artifact of the ibmvfc driver first being upstreamed, and it is well known now that the use of BUG_ON is bad practice except in the most unrecoverable scenario. There is nothing about this scenario that prevents the driver from recovering and carrying on.
Remove the BUG_ON in question from ibmvfc_get_event() and return a NULL pointer in the case of an empty event pool. Update all call sites to ibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate failure or recovery action.
{
"affected": [],
"aliases": [
"CVE-2023-52811"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T16:15:19Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Remove BUG_ON in the case of an empty event pool\n\nIn practice the driver should never send more commands than are allocated\nto a queue\u0027s event pool. In the unlikely event that this happens, the code\nasserts a BUG_ON, and in the case that the kernel is not configured to\ncrash on panic returns a junk event pointer from the empty event list\ncausing things to spiral from there. This BUG_ON is a historical artifact\nof the ibmvfc driver first being upstreamed, and it is well known now that\nthe use of BUG_ON is bad practice except in the most unrecoverable\nscenario. There is nothing about this scenario that prevents the driver\nfrom recovering and carrying on.\n\nRemove the BUG_ON in question from ibmvfc_get_event() and return a NULL\npointer in the case of an empty event pool. Update all call sites to\nibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate\nfailure or recovery action.",
"id": "GHSA-j7xm-pf76-qww8",
"modified": "2024-10-31T18:31:16Z",
"published": "2024-05-21T18:31:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52811"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/88984ec4792766df5a9de7a2ff2b5f281f94c7d4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8bbe784c2ff28d56ca0c548aaf3e584edc77052d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b39f2d10b86d0af353ea339e5815820026bca48f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d2af4ef80601224b90630c1ddc7cd2c7c8ab4dd8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e1d1f79b1929dce470a5dc9281c574cd58e8c6c0"
}
],
"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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