CVE-2026-97939Public exploit

Host memory exhaustion via unaccounted multicast tables

Published Sep 25, 2026 · Updated Sep 25, 2026

Resource exhaustion in Linux 2.6.35 and later allows local users to grow host unreclaimable slab via multicast routing tables. The ip_mroute_setsockopt() and ip6_mroute_setsockopt() paths allocate and retain each unseen mr_table outside memcg accounting until namespace teardown. A non-root local user needs user and network namespaces with namespace-scoped CAP_NET_ADMIN and CAP_NET_RAW; repeated table IDs can exhaust host memory.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux 2.6.35 and later allows local users to grow host unreclaimable slab via multicast routing tables. The ip_mroute_setsockopt() and ip6_mroute_setsockopt() paths allocate and retain each unseen mr_table outside memcg accounting until namespace teardown. A non-root local user needs user and network namespaces with namespace-scoped CAP_NET_ADMIN and CAP_NET_RAW; repeated table IDs can exhaust host memory.

The record

CVE
CVE-2026-97939
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.35
  2. Affected versionversion=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <0264b3ee09b118fec8a5471b4ca288f8ab84722f
  3. Affected versionversion=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <b7ee18725f2292ab554aa96a101ae42d45f008bd
  4. Affected versionversion=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <0264b3ee09b118fec8a5471b4ca288f8ab84722f; version=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <b7ee18725f2292ab554aa96a101ae42d45f008bd; version=f0ad0860d01e47a3ffd220564c5c653b3afbe962 <d0a2e2a4ee6bfe51e398bfb6921a7d0f4c26bc1c

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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