GHSA-6RHP-8RX2-2869

Vulnerability from github – Published: 2024-10-21 21:30 – Updated: 2025-11-04 00:31
VLAI?
Details

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

ext4: fix i_data_sem unlock order in ext4_ind_migrate()

Fuzzing reports a possible deadlock in jbd2_log_wait_commit.

This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require synchronous updates because the file descriptor is opened with O_SYNC. This can lead to the jbd2_journal_stop() function calling jbd2_might_wait_for_commit(), potentially causing a deadlock if the EXT4_IOC_MIGRATE call races with a write(2) system call.

This problem only arises when CONFIG_PROVE_LOCKING is enabled. In this case, the jbd2_might_wait_for_commit macro locks jbd2_handle in the jbd2_journal_stop function while i_data_sem is locked. This triggers lockdep because the jbd2_journal_start function might also lock the same jbd2_handle simultaneously.

Found by Linux Verification Center (linuxtesting.org) with syzkaller.

Rule: add

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

{
  "affected": [],
  "aliases": [
    "CVE-2024-50006"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T19:15:04Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix i_data_sem unlock order in ext4_ind_migrate()\n\nFuzzing reports a possible deadlock in jbd2_log_wait_commit.\n\nThis issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require\nsynchronous updates because the file descriptor is opened with O_SYNC.\nThis can lead to the jbd2_journal_stop() function calling\njbd2_might_wait_for_commit(), potentially causing a deadlock if the\nEXT4_IOC_MIGRATE call races with a write(2) system call.\n\nThis problem only arises when CONFIG_PROVE_LOCKING is enabled. In this\ncase, the jbd2_might_wait_for_commit macro locks jbd2_handle in the\njbd2_journal_stop function while i_data_sem is locked. This triggers\nlockdep because the jbd2_journal_start function might also lock the same\njbd2_handle simultaneously.\n\nFound by Linux Verification Center (linuxtesting.org) with syzkaller.\n\nRule: add",
  "id": "GHSA-6rhp-8rx2-2869",
  "modified": "2025-11-04T00:31:45Z",
  "published": "2024-10-21T21:30:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50006"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c46d6060d3e38de22196c1fe7706c5a3c696285"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4192adefc9c570698821c5eb9873320eac2fcbf1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/53b1999cfd2c7addf2e581a32865fe8835467b44"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6252cb6bde7fc76cb8dcb49d1def7c326b190820"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fedf51ab8cf7b69bff08f37fe0989fec7f5d870"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc749e61c011c255d81b192a822db650c68b313f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d43776b907659affef1de888525847d64b244194"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d58a00e981d3118b91d503da263e640b7cde6729"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef05572da0c0eb89614ed01cc17d3c882bdbd1ff"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/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 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.



Detection rules are retrieved from Rulezet.