CVE-2024-27023 md: Fix missing release of 'active_io' for flush

2024-05-0112:49:21

Linux

www.cve.org

linux kernel

vulnerability

active_io

fix

flush_pending

release

AI Score

6.6

Confidence

Low

EPSS

Percentile

15.5%

JSON

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

md: Fix missing release of ‘active_io’ for flush

submit_flushes
atomic_set(&mddev->flush_pending, 1);
rdev_for_each_rcu(rdev, mddev)
atomic_inc(&mddev->flush_pending);
bi->bi_end_io = md_end_flush
submit_bio(bi);
/* flush io is done first */
md_end_flush
if (atomic_dec_and_test(&mddev->flush_pending))
percpu_ref_put(&mddev->active_io)
-> active_io is not released

if (atomic_dec_and_test(&mddev->flush_pending))
-> missing release of active_io

For consequence, mddev_suspend() will wait for ‘active_io’ to be zero
forever.

Fix this problem by releasing ‘active_io’ in submit_flushes() if
‘flush_pending’ is decreased to zero.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/md.c"
    ],
    "versions": [
      {
        "version": "f9f2d957a8ea",
        "lessThan": "6b2ff10390b1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "530cec617f5a",
        "lessThan": "02dad157ba11",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c4c2345214b6",
        "lessThan": "11f81438927f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "fa2bbff7b0b4",
        "lessThan": "855678ed8534",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/md/md.c"
    ],
    "versions": [
      {
        "version": "6.1.75",
        "lessThan": "6.1.80",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "6.6.14",
        "lessThan": "6.6.19",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "6.7.2",
        "lessThan": "6.7.7",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]