Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc2 ETS net/sched ets_qdisc_change/ets_quantum_parse resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00+

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc2. It has been classified as problematic. Affected by this vulnerability is the function ets_qdisc_change/ets_quantum_parse of the file net/sched of the component ETS. Performing a manipulation results in resource consumption. This vulnerability is cataloged as CVE-2026-98009. The attack must be initiated from a local position. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc2. It has been classified as problematic. This affects the function ets_qdisc_change/ets_quantum_parse of the file net/sched of the component ETS. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98009 since 09/25/2026. The exploitability is told to be easy. An attack has to be approached locally. Additional levels of successful authentication are needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 6.12.111, 6.18.53, 7.2.7 or 7.3-rc3 eliminates this vulnerability. Applying the patch 99ae477b892e203a37985ebc56f0063e072f7f4b/8f80b113dea0bed3c1a31a4224b72775cd9ec52d/de22c30ec5598aca8797f02082d2ee1358dfa3ff/1c38487f46b243bfeefec0c0c86023a3904f2214 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.111/6.18.53/7.2.7/7.3-rc3
Patch: 99ae477b892e203a37985ebc56f0063e072f7f4b/8f80b113dea0bed3c1a31a4224b72775cd9ec52d/de22c30ec5598aca8797f02082d2ee1358dfa3ff/1c38487f46b243bfeefec0c0c86023a3904f2214

Timelineinfo

09/25/2026 Advisory disclosed
09/25/2026 +0 days CVE reserved
09/25/2026 +0 days VulDB entry created
09/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98009 (🔒)
GCVE (CVE): GCVE-0-2026-98009
GCVE (VulDB): GCVE-100-410289

Entryinfo

Created: 09/25/2026 16:28
Changes: 09/25/2026 16:28 (60)
Complete: 🔍
Cache ID: 216::103

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