ghsa-7m5m-jw3r-vxv2
Vulnerability from github
Published
2024-09-04 21:30
Modified
2024-10-10 18:31
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:

sched/smt: Fix unbalance sched_smt_present dec/inc

I got the following warn report while doing stress test:

jump label: negative count! WARNING: CPU: 3 PID: 38 at kernel/jump_label.c:263 static_key_slow_try_dec+0x9d/0xb0 Call Trace: __static_key_slow_dec_cpuslocked+0x16/0x70 sched_cpu_deactivate+0x26e/0x2a0 cpuhp_invoke_callback+0x3ad/0x10d0 cpuhp_thread_fun+0x3f5/0x680 smpboot_thread_fn+0x56d/0x8d0 kthread+0x309/0x400 ret_from_fork+0x41/0x70 ret_from_fork_asm+0x1b/0x30

Because when cpuset_cpu_inactive() fails in sched_cpu_deactivate(), the cpu offline failed, but sched_smt_present is decremented before calling sched_cpu_deactivate(), it leads to unbalanced dec/inc, so fix it by incrementing sched_smt_present in the error path.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-44958"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-04T19:15:30Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/smt: Fix unbalance sched_smt_present dec/inc\n\nI got the following warn report while doing stress test:\n\njump label: negative count!\nWARNING: CPU: 3 PID: 38 at kernel/jump_label.c:263 static_key_slow_try_dec+0x9d/0xb0\nCall Trace:\n \u003cTASK\u003e\n __static_key_slow_dec_cpuslocked+0x16/0x70\n sched_cpu_deactivate+0x26e/0x2a0\n cpuhp_invoke_callback+0x3ad/0x10d0\n cpuhp_thread_fun+0x3f5/0x680\n smpboot_thread_fn+0x56d/0x8d0\n kthread+0x309/0x400\n ret_from_fork+0x41/0x70\n ret_from_fork_asm+0x1b/0x30\n \u003c/TASK\u003e\n\nBecause when cpuset_cpu_inactive() fails in sched_cpu_deactivate(),\nthe cpu offline failed, but sched_smt_present is decremented before\ncalling sched_cpu_deactivate(), it leads to unbalanced dec/inc, so\nfix it by incrementing sched_smt_present in the error path.",
  "id": "GHSA-7m5m-jw3r-vxv2",
  "modified": "2024-10-10T18:31:08Z",
  "published": "2024-09-04T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-44958"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a3548c7ef2e135aee40e7e5e44e7d11b893e7c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2cf7665efe451e48d27953e6b5bc627d518c902b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65727331b60197b742089855ac09464c22b96f66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0c87a3c6be10a57aa3463c32c3fc6b2a47c3dab"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e22f910a26cc2a3ac9c66b8e935ef2a7dd881117"
    }
  ],
  "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.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.