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NVD / CVE Program· CNA Linux

CVE-2026-90185: null_blk: serialize configfs attribute stores with the lock

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 3945ce8cbce4e328e6fdf0b522dc71e340de19db, 65cae82fd3c39b53430672cb9e3ecd267471a6ce, 7e7fff51808237703a3a1df6dd5cae1dfd1db86d.

Low priority for now. Upgrade to Linux Linux 3945ce8cbce4e328e6fdf0b522dc71e340de19db, 65cae82fd3c39b53430672cb9e3ecd267471a6ce, 7e7fff51808237703a3a1df6dd5cae1dfd1db86d or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.5affected
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before 8e839ed5210399a0330a8a6c5885c1d40a537c6daffected · git
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before 88d806d0e1d36246208386a8e55b511c1b3d647caffected · git
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before 3945ce8cbce4e328e6fdf0b522dc71e340de19dbaffected · git
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before 65cae82fd3c39b53430672cb9e3ecd267471a6ceaffected · git
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before c70994c2862b05e44728912b2ea9487d31e2aea7affected · git
    • 45919fbfe1c487c17ea1d198534339a5e8abeae3 and later · before 7e7fff51808237703a3a1df6dd5cae1dfd1db86daffected · git
    • before 5.5not affected · semver
    • 6.1.188 and later · up to and including 6.1.*not affected · semver
    • 6.6.157 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90183Sep 17, 2026 · blk-iolatency: clear delay state when freeing policy data
    0Monitor
  • ← EarlierCVE-2026-90184Sep 17, 2026 · null_blk: serialize configfs attribute updates with device setup
    0Monitor
  • Later →CVE-2026-90186Sep 17, 2026 · null_blk: reject per-device queue resize for shared tag set
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux3945ce8cbce4e328e6fdf0b522dc71e340de19dbVendor (CNA)
Linux Linux65cae82fd3c39b53430672cb9e3ecd267471a6ceVendor (CNA)
Linux Linux7e7fff51808237703a3a1df6dd5cae1dfd1db86dVendor (CNA)
Linux Linux88d806d0e1d36246208386a8e55b511c1b3d647cVendor (CNA)
Linux Linux8e839ed5210399a0330a8a6c5885c1d40a537c6dVendor (CNA)
Linux Linuxc70994c2862b05e44728912b2ea9487d31e2aea7Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records