CVE-2024-38385 genirq/irqdesc: Prevent use-after-free in irq_find_at_or_after()

2024-06-2514:22:37

Linux

www.cve.org

linux kernel

genirq

irqdesc

use-after-free

vulnerability

0.0004 Low

EPSS

Percentile

15.7%

JSON

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.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/irq/irqdesc.c"
    ],
    "versions": [
      {
        "version": "721255b9826b",
        "lessThan": "1c7891812d85",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "721255b9826b",
        "lessThan": "d084aa022f84",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "721255b9826b",
        "lessThan": "b84a8aba8062",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/irq/irqdesc.c"
    ],
    "versions": [
      {
        "version": "6.5",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.5",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.34",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.5",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]