ghsa-8p54-55f6-pg9j
Vulnerability from github
Published
2024-04-17 12:32
Modified
2024-06-27 12:30
Severity
Details
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix hashtab overflow check on 32-bit arches
The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup.
{
"affected": [],
"aliases": [
"CVE-2024-26884"
],
"database_specific": {
"cwe_ids": [
"CWE-119"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-04-17T11:15:10Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix hashtab overflow check on 32-bit arches\n\nThe hashtab code relies on roundup_pow_of_two() to compute the number of\nhash buckets, and contains an overflow check by checking if the\nresulting value is 0. However, on 32-bit arches, the roundup code itself\ncan overflow by doing a 32-bit left-shift of an unsigned long value,\nwhich is undefined behaviour, so it is not guaranteed to truncate\nneatly. This was triggered by syzbot on the DEVMAP_HASH type, which\ncontains the same check, copied from the hashtab code. So apply the same\nfix to hashtab, by moving the overflow check to before the roundup.",
"id": "GHSA-8p54-55f6-pg9j",
"modified": "2024-06-27T12:30:45Z",
"published": "2024-04-17T12:32:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26884"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/33ec04cadb77605b71d9298311919303d390c4d5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3b08cfc65f07b1132c1979d73f014ae6e04de55d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64f00b4df0597590b199b62a37a165473bf658a6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6787d916c2cf9850c97a0a3f73e08c43e7d973b1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8435f0961bf3dc65e204094349bd9aeaac1f8868"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/92c81fbb3ed2e0dfc33a4183a67135e1ab566ace"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a6fa75b5096c0f9826a4fabe22d907b0a5bb1016"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a83fdaeaea3677b83a53f72ace2d73a19bcd6d93"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d817f0d34d927f2deb17dadbfe212c9a6a32ac3e"
},
{
"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Loading...