ghsa-2hfg-4m2j-678g
Vulnerability from github
Published
2024-12-28 12:30
Modified
2024-12-28 12:30
Details

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

media: wl128x: Fix atomicity violation in fmc_send_cmd()

Atomicity violation occurs when the fmc_send_cmd() function is executed simultaneously with the modification of the fmdev->resp_skb value. Consider a scenario where, after passing the validity check within the function, a non-null fmdev->resp_skb variable is assigned a null value. This results in an invalid fmdev->resp_skb variable passing the validity check. As seen in the later part of the function, skb = fmdev->resp_skb; when the invalid fmdev->resp_skb passes the check, a null pointer dereference error may occur at line 478, evt_hdr = (void *)skb->data;

To address this issue, it is recommended to include the validity check of fmdev->resp_skb within the locked section of the function. This modification ensures that the value of fmdev->resp_skb does not change during the validation process, thereby maintaining its validity.

This possible bug is found by an experimental static analysis tool developed by our team. This tool analyzes the locking APIs to extract function pairs that can be concurrently executed, and then analyzes the instructions in the paired functions to identify possible concurrency bugs including data races and atomicity violations.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-56700"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-28T10:15:17Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: wl128x: Fix atomicity violation in fmc_send_cmd()\n\nAtomicity violation occurs when the fmc_send_cmd() function is executed\nsimultaneously with the modification of the fmdev-\u003eresp_skb value.\nConsider a scenario where, after passing the validity check within the\nfunction, a non-null fmdev-\u003eresp_skb variable is assigned a null value.\nThis results in an invalid fmdev-\u003eresp_skb variable passing the validity\ncheck. As seen in the later part of the function, skb = fmdev-\u003eresp_skb;\nwhen the invalid fmdev-\u003eresp_skb passes the check, a null pointer\ndereference error may occur at line 478, evt_hdr = (void *)skb-\u003edata;\n\nTo address this issue, it is recommended to include the validity check of\nfmdev-\u003eresp_skb within the locked section of the function. This\nmodification ensures that the value of fmdev-\u003eresp_skb does not change\nduring the validation process, thereby maintaining its validity.\n\nThis possible bug is found by an experimental static analysis tool\ndeveloped by our team. This tool analyzes the locking APIs\nto extract function pairs that can be concurrently executed, and then\nanalyzes the instructions in the paired functions to identify possible\nconcurrency bugs including data races and atomicity violations.",
  "id": "GHSA-2hfg-4m2j-678g",
  "modified": "2024-12-28T12:30:48Z",
  "published": "2024-12-28T12:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-56700"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2e63c908de357048180516b84740ed62dac0b269"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/372dc9509122e5d45d4c12978e31c3c7d00aaca4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c818ad07e964bca3d27adac1e1f50e1e3c9180e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80a3b2ee01eecf22dfa06968b3cde92c691dea10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca59f9956d4519ab18ab2270be47c6b8c6ced091"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d16109c9fdc1b8cea4fe63b42e06e926c3f68990"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed228b74d8a500380150965d5becabf9a1e33141"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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