CVE-2026-98857Public exploitHinoki check available

Denial of service via unbounded scheduler caches

Published Oct 18, 2026 · Updated Oct 18, 2026

Memory exhaustion in Linux IPVS allows local users to cause denial of service through unbounded LBLC and LBLCR cache growth. The ip_vs_lblc_new() and ip_vs_lblcr_new() functions allocate entries for new destination addresses without enforcing an admission limit, while collection retains actively used entries. Exploitation requires access to the affected schedulers; unprivileged user and network namespaces provide a demonstrated local path, and exhaustion causes a kernel panic when panic-on-OOM is enabled.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory exhaustion in Linux IPVS allows local users to cause denial of service through unbounded LBLC and LBLCR cache growth. The ip_vs_lblc_new() and ip_vs_lblcr_new() functions allocate entries for new destination addresses without enforcing an admission limit, while collection retains actively used entries. Exploitation requires access to the affected schedulers; unprivileged user and network namespaces provide a demonstrated local path, and exhaustion causes a kernel panic when panic-on-OOM is enabled.

The record

CVE
CVE-2026-98857
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <16c83c047ecfaf226ad81d45d77fa11a3184d0e4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a3c3de660f96865f303fd25f1285f2ffbfd521d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <31028d7b970962fbeda1e9131405c76551094300
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6316d17324bd4ca400c26adb7b656c6e3447c209
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <16c83c047ecfaf226ad81d45d77fa11a3184d0e4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a3c3de660f96865f303fd25f1285f2ffbfd521d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <31028d7b970962fbeda1e9131405c76551094300; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6316d17324bd4ca400c26adb7b656c6e3447c209; version=2.6.12

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.

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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

T1499.001OS Exhaustion Flood

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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