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NVD / CVE Program· CNA Linux

CVE-2026-90284: firmware_loader: do not queue completed sysfs fallback requests

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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 4.20, 5.10.270, 5.14; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 4.20, 5.10.270, 5.14; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: firmware_loader: do not queue completed sysfs fallback requests fw_load_sysfs_fallback() calls device_add() before adding the fw_priv to pending_fw_head. device_add() publishes the fallback loading interface, so a userspace helper which discovers the device by scanning sysfs can write 0 to the loading attribute and complete the request before it is queued as pending. In that interleaving firmware_loading_store() calls fw_state_done() while pending_list still points to itself, so it cannot remove an entry from pending_fw_head. The subsequent unconditional list_add() then queues an already-completed fw_priv. Once the request is released, pending_fw_head can retain a pointer to freed memory and the next fallback request can fault while validating the list. Only in-flight fallback requests need suspend or reboot abort handling. If the request is already DONE after device_add(), return success from the fallback path without sending another uevent, waiting again, or queueing it as pending. This preserves the invariant that pending_fw_head contains only active fallback requests.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th 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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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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

    • 67cf0fbcac0d42d4d4686cddc1e39f465bbfec37, d09639528b66b5c7c20dc8f7fb8928aacabd40bb, c14a54675db7131791402fa22fb0fa6da1f5fb66, 5.14affected
    • ecb739cf15a9bae040ce6b60209b78b92512d120 and later · before c8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7affected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before 93a2385730540105df8524447dcc11309ad280f9affected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before ea33fac0df7fe7b49a4b27acb83e227b82317d1daffected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before 5a250bff75a446374c05622973b18b4ab662b504affected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before 85aeb8fc61839098ae0942ccba86e669c08e75d4affected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before 6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7baffected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before fb4824880b0dba0e7b3a497c46c642f979630392affected · git
    • 75d95e2e39b27f733f21e6668af1c9893a97de5e and later · before b48373c901951fad1a26bd7c33ad91172b3945b5affected · git
    • 5.10.58 and later · before 5.10.270affected · 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-2026-90282Sep 17, 2026 · phy: qcom: qmp-usb-legacy: Fix possible NULL-deref on early runtime suspend
    0Monitor
  • ← EarlierCVE-2026-90283Sep 17, 2026 · hugetlbfs: release subpool on fill_super failure
    0Monitor
  • Later →CVE-2026-90285Sep 17, 2026 · scsi: qla2xxx: Remove redundant VPD flash read in sysfs read path
    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 Linux4.20Vendor (CNA)
Linux Linux5.10.270Vendor (CNA)
Linux Linux5.14Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux5a250bff75a446374c05622973b18b4ab662b504Vendor (CNA)
Linux Linux6eaa632d0ed7bbb84f9cb670e5ec4e2cecf4cc7bVendor (CNA)
Linux Linux85aeb8fc61839098ae0942ccba86e669c08e75d4Vendor (CNA)
Linux Linux93a2385730540105df8524447dcc11309ad280f9Vendor (CNA)
Linux Linuxb48373c901951fad1a26bd7c33ad91172b3945b5Vendor (CNA)
Linux Linuxc8b97c5130f27b64fa2cfe1aa4bebb13f724c6c7Vendor (CNA)
Linux Linuxea33fac0df7fe7b49a4b27acb83e227b82317d1dVendor (CNA)
Linux Linuxfb4824880b0dba0e7b3a497c46c642f979630392Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
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.

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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 (7 more)

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

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