CVE-2026-98419

Memory overwrite via header-inclusive payload zeroing

Published Oct 14, 2026 · Updated Oct 14, 2026

Out-of-bounds writing in Linux drop_monitor allows local users to exceed a Netlink alert buffer's requested payload by four bytes. The reset_per_cpu_data() function includes the attribute header in the length passed to memset() even though zeroing begins after that header. Starting monitoring requires administrative access; allocator padding complicates the reported corruption, and the retrieved sources demonstrate no crash or privilege escalation.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds writing in Linux drop_monitor allows local users to exceed a Netlink alert buffer's requested payload by four bytes. The reset_per_cpu_data() function includes the attribute header in the length passed to memset() even though zeroing begins after that header. Starting monitoring requires administrative access; allocator padding complicates the reported corruption, and the retrieved sources demonstrate no crash or privilege escalation.

The record

CVE
CVE-2026-98419
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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=2.6.31
  2. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <03b672eba4937ff18337049824a114012d57f202
  3. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <439f392084f8f7f59ab9d47a9579185accefe1d8
  4. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <530ae0a1458078c7a81fbffd9ff17d42129364d9
  5. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <56b12f0cd476e4d90a0e2663a80102b388ebf78c
  6. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <88d640efd655b10f9fa4e381caf777da1f17c2a6
  7. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <8a04047c6dbff2f49a561b1ff53b043f4807e855
  8. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <caf09c09e0f323015ab6777ed1bad5aa10688631
  9. Affected versionversion=683703a26e4677db437a1480682851e27c7a154f <d54a044136b129822715e8798899af540ec7a9e9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=683703a26e4677db437a1480682851e27c7a154f <03b672eba4937ff18337049824a114012d57f202; version=683703a26e4677db437a1480682851e27c7a154f <439f392084f8f7f59ab9d47a9579185accefe1d8; version=683703a26e4677db437a1480682851e27c7a154f <530ae0a1458078c7a81fbffd9ff17d42129364d9; version=683703a26e4677db437a1480682851e27c7a154f <56b12f0cd476e4d90a0e2663a80102b388ebf78c; version=683703a26e4677db437a1480682851e27c7a154f <88d640efd655b10f9fa4e381caf777da1f17c2a6; version=683703a26e4677db437a1480682851e27c7a154f <8a04047c6dbff2f49a561b1ff53b043f4807e855; version=683703a26e4677db437a1480682851e27c7a154f <caf09c09e0f323015ab6777ed1bad5aa10688631; version=683703a26e4677db437a1480682851e27c7a154f <d54a044136b129822715e8798899af540ec7a9e9

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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