null_blk: serialize configfs attribute stores with the lock
In the Linux kernel, the following vulnerability has been resolved: null_blk: serialize configfs attribute stores with the lock The NULLB_DEVICE_ATTR _store takes no lock: apply_fn attributes (submit_queues, poll_queues) get dev->NAME written again after apply_fn returns, outside its lock; APPLY=NULL attributes are entirely lockless. configfs only serializes stores per-open-file, so concurrent stores on separate fds race. For apply_fn attributes, once one store's apply_fn has reconfigured the hardware, a second (losing) store can still overwrite dev->NAME afterwards. This leaves dev->submit_queues out of sync with the live queue count, which is later caught by the WARN_ON_ONCE() in null_map_queues(). For !apply_fn attributes, power_store()'s null_add_dev() validates and builds the device under "lock" but only sets CONFIGURED afterwards. A store slipping in during this window can change a field mid-setup -- for example, zone_nr_conv can be pushed above nr_zones after it has already been clamped, leading to an out-of-bounds dev->zones[] access. Take "lock" in the macro around the apply_fn call, the CONFIGURED test and the field write, and move it out of nullb_apply_submit_queues()/ nullb_apply_poll_queues() so both paths are covered once. This serializes stores with power_store's setup and with each other.
CVE-2026-90185
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-2026-90185
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": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "8e839ed5210399a0330a8a6c5885c1d40a537c6d",
"versionType": "git"
},
{
"status": "affected",
"version": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "88d806d0e1d36246208386a8e55b511c1b3d647c",
"versionType": "git"
},
{
"status": "affected",
"version": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "3945ce8cbce4e328e6fdf0b522dc71e340de19db",
"versionType": "git"
},
{
"status": "affected",
"version": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "65cae82fd3c39b53430672cb9e3ecd267471a6ce",
"versionType": "git"
},
{
"status": "affected",
"version": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "c70994c2862b05e44728912b2ea9487d31e2aea7",
"versionType": "git"
},
{
"status": "affected",
"version": "45919fbfe1c487c17ea1d198534339a5e8abeae3",
"lessThan": "7e7fff51808237703a3a1df6dd5cae1dfd1db86d",
"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": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"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-2026-90185
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36566 · Revision 1
- Added to Heist Feed
- Publisher date