ghsa-9mp7-jx47-xv3h
Vulnerability from github
Published
2025-09-23 06:30
Modified
2025-10-02 15:31
Details

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

can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB

can_put_echo_skb() takes ownership of the SKB and it may be freed during or after the call.

However, xilinx_can xcan_write_frame() keeps using SKB after the call.

Fix that by only calling can_put_echo_skb() after the code is done touching the SKB.

The tx_lock is held for the entire xcan_write_frame() execution and also on the can_get_echo_skb() side so the order of operations does not matter.

An earlier fix commit 3d3c817c3a40 ("can: xilinx_can: Fix usage of skb memory") did not move the can_put_echo_skb() call far enough.

[mkl: add "commit" in front of sha1 in patch description] [mkl: fix indention]

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-39873"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-23T06:15:46Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB\n\ncan_put_echo_skb() takes ownership of the SKB and it may be freed\nduring or after the call.\n\nHowever, xilinx_can xcan_write_frame() keeps using SKB after the call.\n\nFix that by only calling can_put_echo_skb() after the code is done\ntouching the SKB.\n\nThe tx_lock is held for the entire xcan_write_frame() execution and\nalso on the can_get_echo_skb() side so the order of operations does not\nmatter.\n\nAn earlier fix commit 3d3c817c3a40 (\"can: xilinx_can: Fix usage of skb\nmemory\") did not move the can_put_echo_skb() call far enough.\n\n[mkl: add \"commit\" in front of sha1 in patch description]\n[mkl: fix indention]",
  "id": "GHSA-9mp7-jx47-xv3h",
  "modified": "2025-10-02T15:31:13Z",
  "published": "2025-09-23T06:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39873"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1139321161a3ba5e45e61e0738b37f42f20bc57a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.