Skip to content
Heist/ feed
Unrated

null_blk: serialize configfs attribute updates with device setup

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: null_blk: serialize configfs attribute updates with device setup The attribute store methods generated with NULLB_DEVICE_ATTR() refuse to change the configuration of a live device by testing NULLB_DEV_FL_CONFIGURED, but that flag is only set by nullb_device_power_store() after null_add_dev() has returned, and the store methods take no lock at all. configfs only serializes writes to the same open file (buffer->mutex), so a write to any attribute can run concurrently with null_add_dev() and change the device configuration while it is being used. null_add_dev() reads the configuration several times, e.g. dev->zoned is read once to set up the queue limits and once to initialize the zone resources: CPU0: echo 1 > nullb0/power CPU1: echo 1 > nullb0/zoned nullb_device_power_store() mutex_lock(&lock) null_add_dev() if (dev->zoned) -> false /* no BLK_FEAT_ZONED */ nullb_device_zoned_store() test_bit(FL_CONFIGURED) -> 0 dev->zoned = true blk_mq_alloc_disk() /* queue is not zoned */ if (nullb->dev->zoned) -> true null_register_zoned_dev() blk_revalidate_disk_zones() blk_revalidate_disk_zones() is then called for a queue that does not have BLK_FEAT_ZONED set, which triggers its WARN_ON_ONCE() and fails the device setup with -EIO: WARNING: CPU: 2 PID: 322 at block/blk-zoned.c:2357 blk_revalidate_disk_zones+0x4c/0x560 Clearing dev->zoned in the same window is worse: the queue is created with BLK_FEAT_ZONED but the zone res

Announced Source revision 1
Original source ↗

CVE-2026-90184

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90184

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "6352e7ead2d8111802a554eeb94886f5a9894bb9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "7de792b4c48fba02a36a8077032f7d5093c925e5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "aed8af338a09a64d63b068a803c4ecfc5701dd4c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "32456a85995579e56c60cc53c357cda75a9d4f7c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "d3d35dd045a35991bf6fd13de5f293e6dd7bf3b3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa",
        "lessThan": "4e1f23f9c33c156be7e313b40695af5a3a834739",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/block/null_blk/main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/block/null_blk/main.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90184

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36563 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement