ghsa-6vwm-9rmv-mwwv
Vulnerability from github
Published
2024-06-25 15:31
Modified
2024-09-03 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:

genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()

irq_find_at_or_after() dereferences the interrupt descriptor which is returned by mt_find() while neither holding sparse_irq_lock nor RCU read lock, which means the descriptor can be freed between mt_find() and the dereference:

CPU0                            CPU1
desc = mt_find()
                                delayed_free_desc(desc)
irq_desc_get_irq(desc)

The use-after-free is reported by KASAN:

Call trace:
 irq_get_next_irq+0x58/0x84
 show_stat+0x638/0x824
 seq_read_iter+0x158/0x4ec
 proc_reg_read_iter+0x94/0x12c
 vfs_read+0x1e0/0x2c8

Freed by task 4471:
 slab_free_freelist_hook+0x174/0x1e0
 __kmem_cache_free+0xa4/0x1dc
 kfree+0x64/0x128
 irq_kobj_release+0x28/0x3c
 kobject_put+0xcc/0x1e0
 delayed_free_desc+0x14/0x2c
 rcu_do_batch+0x214/0x720

Guard the access with a RCU read lock section.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2024-38385"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-25T15:15:13Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngenirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()\n\nirq_find_at_or_after() dereferences the interrupt descriptor which is\nreturned by mt_find() while neither holding sparse_irq_lock nor RCU read\nlock, which means the descriptor can be freed between mt_find() and the\ndereference:\n\n    CPU0                            CPU1\n    desc = mt_find()\n                                    delayed_free_desc(desc)\n    irq_desc_get_irq(desc)\n\nThe use-after-free is reported by KASAN:\n\n    Call trace:\n     irq_get_next_irq+0x58/0x84\n     show_stat+0x638/0x824\n     seq_read_iter+0x158/0x4ec\n     proc_reg_read_iter+0x94/0x12c\n     vfs_read+0x1e0/0x2c8\n\n    Freed by task 4471:\n     slab_free_freelist_hook+0x174/0x1e0\n     __kmem_cache_free+0xa4/0x1dc\n     kfree+0x64/0x128\n     irq_kobj_release+0x28/0x3c\n     kobject_put+0xcc/0x1e0\n     delayed_free_desc+0x14/0x2c\n     rcu_do_batch+0x214/0x720\n\nGuard the access with a RCU read lock section.",
  "id": "GHSA-6vwm-9rmv-mwwv",
  "modified": "2024-09-03T18:31:31Z",
  "published": "2024-06-25T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38385"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c7891812d85500ae2ca4051fa5683fcf29930d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b84a8aba806261d2f759ccedf4a2a6a80a5e55ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d084aa022f84319f8079e30882cbcbc026af9f21"
    }
  ],
  "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"
    }
  ]
}


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