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NVD / CVE Program· CNA Linux

CVE-2026-90074: net/sched: fq_pie: clamp default quantum to avoid signed overflow

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 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795, 1f43e4dbc93b7d02761a024d5f895df823c07b72, 435da3734a8e63d3067016accc977ed1d10aaaa0; 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 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795, 1f43e4dbc93b7d02761a024d5f895df823c07b72, 435da3734a8e63d3067016accc977ed1d10aaaa0; 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: net/sched: fq_pie: clamp default quantum to avoid signed overflow fq_pie_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) without clamping. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, which overflows the signed flow->deficit to INT_MIN in fq_pie_qdisc_dequeue(), causing an infinite loop and soft lockup. Emulate fq_pie_policy which is already bounded to [1, 1 << 20]; clamp the default to [256, 1 << 20]. 256 matches fq_codel's floor and is a sane minimum for a DRR quantum. Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.

—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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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • 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

    • 5.6affected
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before 1f43e4dbc93b7d02761a024d5f895df823c07b72affected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before f7942b2693bc24c7d609a03d06f97bee3b0bd96aaffected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before 6f1be05faecef4c0f9a008200209f66ef2e133f7affected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before 435da3734a8e63d3067016accc977ed1d10aaaa0affected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51faffected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795affected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before bf97fd2163ad1191ef8daa3d4df8372aee19e396affected · git
    • ec97ecf1ebe485a17cd8395a5f35e6b80b57665a and later · before c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9affected · git
    • before 5.6not 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-2026-90072Sep 17, 2026 · net/sched: sfq: clamp quantum to avoid signed overflow soft lockup
    0Monitor
  • ← EarlierCVE-2026-90073Sep 17, 2026 · net/sched: hhf: clamp quantum before hhf_change() to avoid overflow
    0Monitor
  • Later →CVE-2026-90075Sep 17, 2026 · net/sched: fq_codel: clamp default quantum and mtu
    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 Linux044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795Vendor (CNA)
Linux Linux1f43e4dbc93b7d02761a024d5f895df823c07b72Vendor (CNA)
Linux Linux435da3734a8e63d3067016accc977ed1d10aaaa0Vendor (CNA)
Linux Linux44dad8fe99b58a7fe2961e9eec6a5f07ace5b51fVendor (CNA)
Linux Linux6f1be05faecef4c0f9a008200209f66ef2e133f7Vendor (CNA)
Linux Linuxbf97fd2163ad1191ef8daa3d4df8372aee19e396Vendor (CNA)
Linux Linuxc86cd7ed0b0e44779a3d1683f03e4353baf4bdc9Vendor (CNA)
Linux Linuxf7942b2693bc24c7d609a03d06f97bee3b0bd96aVendor (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.

—

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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