ghsa-8p54-55f6-pg9j
Vulnerability from github
Published
2024-04-17 12:32
Modified
2024-06-27 12:30
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-26884"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-119",
      "CWE-190"
    ],
    "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"
    }
  ]
}


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