GHSA-JV5M-87G4-WP39

Vulnerability from github – Published: 2024-05-21 18:31 – Updated: 2026-08-04 12:33
VLAI
Details

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

media: bttv: fix use after free error due to btv->timeout timer

There may be some a race condition between timer function bttv_irq_timeout and bttv_remove. The timer is setup in probe and there is no timer_delete operation in remove function. When it hit kfree btv, the function might still be invoked, which will cause use after free bug.

This bug is found by static analysis, it may be false positive.

Fix it by adding del_timer_sync invoking to the remove function.

cpu0 cpu1 bttv_probe ->timer_setup ->bttv_set_dma ->mod_timer; bttv_remove ->kfree(btv); ->bttv_irq_timeout ->USE btv

Severity
7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2023-52847"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T16:15:21Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: bttv: fix use after free error due to btv-\u003etimeout timer\n\nThere may be some a race condition between timer function\nbttv_irq_timeout and bttv_remove. The timer is setup in\nprobe and there is no timer_delete operation in remove\nfunction. When it hit kfree btv, the function might still be\ninvoked, which will cause use after free bug.\n\nThis bug is found by static analysis, it may be false positive.\n\nFix it by adding del_timer_sync invoking to the remove function.\n\ncpu0                cpu1\n                  bttv_probe\n                    -\u003etimer_setup\n                      -\u003ebttv_set_dma\n                        -\u003emod_timer;\nbttv_remove\n  -\u003ekfree(btv);\n                  -\u003ebttv_irq_timeout\n                    -\u003eUSE btv",
  "id": "GHSA-jv5m-87g4-wp39",
  "modified": "2026-08-04T12:33:15Z",
  "published": "2024-05-21T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52847"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1871014d6ef4812ad11ef7d838d73ce09d632267"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20568d06f6069cb835e05eed432edf962645d226"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3d9198cdae1cb079ec8652f4defacd481eab2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51c94256a83fe4e17406c66ff3e1ad7d242d8574"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/847599fffa528b2cdec4e21b6bf7586dad982132"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b35fdade92c5058a5e727e233fe263b828de2c9a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd5b50b329e850d467e7bcc07b2b6bde3752fbda"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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