CVE-2024-27009 s390/cio: fix race condition during online processing

2024-05-0105:29:18

Linux

www.cve.org

linux kernel

s390/cio

race condition

vulnerability

device state

0.0004 Low

EPSS

Percentile

15.6%

JSON

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

s390/cio: fix race condition during online processing

A race condition exists in ccw_device_set_online() that can cause the
online process to fail, leaving the affected device in an inconsistent
state. As a result, subsequent attempts to set that device online fail
with return code ENODEV.

The problem occurs when a path verification request arrives after
a wait for final device state completed, but before the result state
is evaluated.

Fix this by ensuring that the CCW-device lock is held between
determining final state and checking result state.

Note that since:

commit 2297791c92d0 (“s390/cio: dont unregister subchannel from child-drivers”)

path verification requests are much more likely to occur during boot,
resulting in an increased chance of this race condition occurring.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/s390/cio/device.c"
    ],
    "versions": [
      {
        "version": "2297791c92d0",
        "lessThan": "3076b3c38a70",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2297791c92d0",
        "lessThan": "559f3a633339",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2297791c92d0",
        "lessThan": "2df56f4ea769",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2297791c92d0",
        "lessThan": "a4234decd0fe",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2297791c92d0",
        "lessThan": "2d8527f2f911",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/s390/cio/device.c"
    ],
    "versions": [
      {
        "version": "5.15",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.15",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.157",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.88",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.29",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.8",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]