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NVD / CVE Program· CNA Linux

CVE-2026-98009: net/sched: ets: clamp quantum in parse and fallback paths

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 1c38487f46b243bfeefec0c0c86023a3904f2214, 226d2702e74a570f5bfae6115b4706da4b94e5cf, 440b66cc7b56ea38e9b878ae88da91992efaa4c4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 1c38487f46b243bfeefec0c0c86023a3904f2214, 226d2702e74a570f5bfae6115b4706da4b94e5cf, 440b66cc7b56ea38e9b878ae88da91992efaa4c4; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1

—No exploit Fix available
Published
Sep 25, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th 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 · 0.1%

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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
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 440b66cc7b56ea38e9b878ae88da91992efaa4c4affected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 4ef8664eafafc8db68a1d52601f17dc008a223b7affected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 8b8d782c3b96376217087767dcf662cd3d25f226affected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 226d2702e74a570f5bfae6115b4706da4b94e5cfaffected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 99ae477b892e203a37985ebc56f0063e072f7f4baffected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 8f80b113dea0bed3c1a31a4224b72775cd9ec52daffected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before de22c30ec5598aca8797f02082d2ee1358dfa3ffaffected · git
    • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 and later · before 1c38487f46b243bfeefec0c0c86023a3904f2214affected · 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 7.2.7-17.2.7-1

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-2026-98007Sep 25, 2026 · bpf: Reject non-scalar bpf_loop iteration counts
    0Monitor
  • ← EarlierCVE-2026-98008Sep 25, 2026 · net: macb: fix NULL pointer dereference on unbind with fixed-link
    0Monitor
  • Later →CVE-2026-98010Sep 25, 2026 · net/sched: drr: clamp quantum in change class
    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 Linux1c38487f46b243bfeefec0c0c86023a3904f2214Vendor (CNA)
Linux Linux226d2702e74a570f5bfae6115b4706da4b94e5cfVendor (CNA)
Linux Linux440b66cc7b56ea38e9b878ae88da91992efaa4c4Vendor (CNA)
Linux Linux4ef8664eafafc8db68a1d52601f17dc008a223b7Vendor (CNA)
Linux Linux8b8d782c3b96376217087767dcf662cd3d25f226Vendor (CNA)
Linux Linux8f80b113dea0bed3c1a31a4224b72775cd9ec52dVendor (CNA)
Linux Linux99ae477b892e203a37985ebc56f0063e072f7f4bVendor (CNA)
Linux Linuxde22c30ec5598aca8797f02082d2ee1358dfa3ffVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

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