GHSA-285G-GC96-4XJH

Vulnerability from github – Published: 2024-09-04 21:30 – Updated: 2025-11-04 00:31
VLAI
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.

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "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": "2025-11-04T00:31:21Z",
  "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"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "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"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.