null_blk: serialize configfs attribute stores with the lock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90185
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:12 UTC
Updated2026-10-19 09:19:08 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 8e839ed5210399a0330a8a6c5885c1d40a537c6d git Not specified
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 88d806d0e1d36246208386a8e55b511c1b3d647c git Not specified
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 3945ce8cbce4e328e6fdf0b522dc71e340de19db git Not specified
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 65cae82fd3c39b53430672cb9e3ecd267471a6ce git Not specified
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 c70994c2862b05e44728912b2ea9487d31e2aea7 git Not specified
CNA Linux Linux affected 45919fbfe1c487c17ea1d198534339a5e8abeae3 7e7fff51808237703a3a1df6dd5cae1dfd1db86d git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/88d806d0e1d36246208386a8e55b511c1b3d647c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/65cae82fd3c39b53430672cb9e3ecd267471a6ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3945ce8cbce4e328e6fdf0b522dc71e340de19db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e7fff51808237703a3a1df6dd5cae1dfd1db86d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e839ed5210399a0330a8a6c5885c1d40a537c6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c70994c2862b05e44728912b2ea9487d31e2aea7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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