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NVD / CVE Program· CNA Linux

CVE-2026-98012: net/sched: sfq: clamp quantum in change path

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 0692ce5a528df450d64e9f819054177e9d91076f, 4117c528b2de5fdc3e4a7e3626815b616a635cdc, 5.10.271; 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 0692ce5a528df450d64e9f819054177e9d91076f, 4117c528b2de5fdc3e4a7e3626815b616a635cdc, 5.10.271; 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: sfq: clamp quantum in change path sfq_change() accepts any non-negative quantum (only rejects (int)ctl->quantum < 0). With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service). Add max(256U, ...) matching fq_codel_change(). Reject quantum > 1<<20 with -EINVAL, matching fq_codel_change() and the init clamp. Conditions to recreate the bug: CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root sfq tc qdisc change dev dummy0 root sfq quantum 1 stab data 32768 size_log 15 cell_log 0

—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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  • A fix has been released

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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

    • 843cacb88f42f426973f1ed11c6fb562558efb27, 6.13affected
    • 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa and later · before 4117c528b2de5fdc3e4a7e3626815b616a635cdcaffected · git
    • 548cf048b426729a7a1fa6acd1271c010c9a7380 and later · before f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0affected · git
    • c49ac48fac51a6a54efd5963954d02bacf075085 and later · before 0692ce5a528df450d64e9f819054177e9d91076faffected · git
    • 58ae7465f0e7113d45aa88a66bf2d203c71c195e and later · before e4192bcf83aaab02129644ddf4656fd86e93751faffected · git
    • 82bd38bd5467ece1ee274b493f51326cf5220a5a and later · before f3820dce042a673fcb28cc31c87ee14257e21a17affected · git
    • e4650d7ae4252f67e997a632adfae0dd74d3a99a and later · before 534cd7ecbbc6e8a974f4003a5c1557439c6e0a72affected · git
    • e4650d7ae4252f67e997a632adfae0dd74d3a99a and later · before e6c1cb728e389354203a72bc77464c222a247aebaffected · git
    • e4650d7ae4252f67e997a632adfae0dd74d3a99a and later · before fb9f88a33c516ea5c0bcd9a22ca288b246b34567affected · git
    • 5.10.239 and later · before 5.10.271affected · 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-2026-98010Sep 25, 2026 · net/sched: drr: clamp quantum in change class
    0Monitor
  • ← EarlierCVE-2026-98011Sep 25, 2026 · net/sched: hhf: clamp quantum in change and init paths
    0Monitor
  • Later →CVE-2026-98013Sep 25, 2026 · net/sched: fq_pie: clamp quantum in change 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 Linux0692ce5a528df450d64e9f819054177e9d91076fVendor (CNA)
Linux Linux4117c528b2de5fdc3e4a7e3626815b616a635cdcVendor (CNA)
Linux Linux5.10.271Vendor (CNA)
Linux Linux5.15.222Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux534cd7ecbbc6e8a974f4003a5c1557439c6e0a72Vendor (CNA)
Linux Linux6.1.189Vendor (CNA)
Linux Linux6.12.111Vendor (CNA)
Linux Linux6.6.158Vendor (CNA)
Linux Linuxe4192bcf83aaab02129644ddf4656fd86e93751fVendor (CNA)
Linux Linuxe6c1cb728e389354203a72bc77464c222a247aebVendor (CNA)
Linux Linuxf3820dce042a673fcb28cc31c87ee14257e21a17Vendor (CNA)
Linux Linuxf82fa6f10d4a69322cad0f7a4aa523ce6292a5a0Vendor (CNA)
Linux Linuxfb9f88a33c516ea5c0bcd9a22ca288b246b34567Vendor (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✗ → ✓

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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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