ghsa-285g-gc96-4xjh
Vulnerability from github
Published
2024-09-04 21:30
Modified
2024-10-03 18:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

tick/broadcast: Move per CPU pointer access into the atomic section

The recent fix for making the take over of the broadcast timer more reliable retrieves a per CPU pointer in preemptible context.

This went unnoticed as compilers hoist the access into the non-preemptible region where the pointer is actually used. But of course it's valid that the compiler keeps it at the place where the code puts it which rightfully triggers:

BUG: using smp_processor_id() in preemptible [00000000] code: caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0

Move it to the actual usage site which is in a non-preemptible region.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2024-44968"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-04T19:15:31Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntick/broadcast: Move per CPU pointer access into the atomic section\n\nThe recent fix for making the take over of the broadcast timer more\nreliable retrieves a per CPU pointer in preemptible context.\n\nThis went unnoticed as compilers hoist the access into the non-preemptible\nregion where the pointer is actually used. But of course it\u0027s valid that\nthe compiler keeps it at the place where the code puts it which rightfully\ntriggers:\n\n  BUG: using smp_processor_id() in preemptible [00000000] code:\n       caller is hotplug_cpu__broadcast_tick_pull+0x1c/0xc0\n\nMove it to the actual usage site which is in a non-preemptible region.",
  "id": "GHSA-285g-gc96-4xjh",
  "modified": "2024-10-03T18:30:35Z",
  "published": "2024-09-04T21:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44968"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/541a900d245536d4809cb1aa322c3fcc2cdb58a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/668c6c4a7e9e9f081c06b70f30104fb7013437ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6881e75237a84093d0986f56223db3724619f26e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b3ec186ba93e333e9efe7254e7e31c1828e5d2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7dd12f85f150010ef7518201c63fa7e395f5c3e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9d604933d5fd72dd37f24e1dc35f778297d745a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f54abf332a2bc0413cfa8bd6a8511f7aa99faea0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f91fb47ecacc178a83a77eeebd25cbaec18c01d6"
    }
  ],
  "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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