{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90184", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.791Z", "datePublished": "2026-09-17T16:07:07.728Z", "dateUpdated": "2026-10-19T08:59:21.103Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:59:21.103Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnull_blk: serialize configfs attribute updates with device setup\n\nThe attribute store methods generated with NULLB_DEVICE_ATTR() refuse to\nchange the configuration of a live device by testing\nNULLB_DEV_FL_CONFIGURED, but that flag is only set by\nnullb_device_power_store() after null_add_dev() has returned, and the\nstore methods take no lock at all. configfs only serializes writes to\nthe same open file (buffer->mutex), so a write to any attribute can run\nconcurrently with null_add_dev() and change the device configuration\nwhile it is being used.\n\nnull_add_dev() reads the configuration several times, e.g. dev->zoned is\nread once to set up the queue limits and once to initialize the zone\nresources:\n\n CPU0: echo 1 > nullb0/power CPU1: echo 1 > nullb0/zoned\n nullb_device_power_store()\n mutex_lock(&lock)\n null_add_dev()\n if (dev->zoned) -> false\n /* no BLK_FEAT_ZONED */ nullb_device_zoned_store()\n test_bit(FL_CONFIGURED) -> 0\n dev->zoned = true\n blk_mq_alloc_disk()\n /* queue is not zoned */\n if (nullb->dev->zoned) -> true\n null_register_zoned_dev()\n blk_revalidate_disk_zones()\n\nblk_revalidate_disk_zones() is then called for a queue that does not\nhave BLK_FEAT_ZONED set, which triggers its WARN_ON_ONCE() and fails the\ndevice setup with -EIO:\n\n WARNING: CPU: 2 PID: 322 at block/blk-zoned.c:2357 blk_revalidate_disk_zones+0x4c/0x560\n\nClearing dev->zoned in the same window is worse: the queue is created\nwith BLK_FEAT_ZONED but the zone resources are never initialized, so\nadd_disk() succeeds for a zoned disk that has no zones. And a store that\nlands after the last dev->zoned test leaves dev->zoned set while\ndev->zones is still NULL, which null_process_zoned_cmd() dereferences on\nthe first write.\n\nFix this by taking the global lock, which nullb_device_power_store()\nalready holds across null_add_dev() and null_del_dev(), around both the\nNULLB_DEV_FL_CONFIGURED test and the update of the device configuration.\nThe submit_queues and poll_queues apply callbacks are now called with\nthat lock held, so remove the locking they did themselves.\n\nSince the store methods can run as soon as configfs_register_subsystem()\nreturns, that is, before null_init() gets to mutex_init(&lock), also\ninitialize the lock statically with DEFINE_MUTEX()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/block/null_blk/main.c" ], "versions": [ { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "6352e7ead2d8111802a554eeb94886f5a9894bb9", "status": "affected", "versionType": "git" }, { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "7de792b4c48fba02a36a8077032f7d5093c925e5", "status": "affected", "versionType": "git" }, { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "aed8af338a09a64d63b068a803c4ecfc5701dd4c", "status": "affected", "versionType": "git" }, { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "32456a85995579e56c60cc53c357cda75a9d4f7c", "status": "affected", "versionType": "git" }, { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "d3d35dd045a35991bf6fd13de5f293e6dd7bf3b3", "status": "affected", "versionType": "git" }, { "version": "3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa", "lessThan": "4e1f23f9c33c156be7e313b40695af5a3a834739", "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/block/null_blk/main.c" ], "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6352e7ead2d8111802a554eeb94886f5a9894bb9" }, { "url": "https://git.kernel.org/stable/c/7de792b4c48fba02a36a8077032f7d5093c925e5" }, { "url": "https://git.kernel.org/stable/c/aed8af338a09a64d63b068a803c4ecfc5701dd4c" }, { "url": "https://git.kernel.org/stable/c/32456a85995579e56c60cc53c357cda75a9d4f7c" }, { "url": "https://git.kernel.org/stable/c/d3d35dd045a35991bf6fd13de5f293e6dd7bf3b3" }, { "url": "https://git.kernel.org/stable/c/4e1f23f9c33c156be7e313b40695af5a3a834739" } ], "title": "null_blk: serialize configfs attribute updates with device setup", "x_generator": { "engine": "bippy-1.2.0" } } } }