CVE-2026-98495Public exploitHinoki check available

Stack overread via unterminated ARP device name

Published Oct 18, 2026 · Updated Oct 18, 2026

Out-of-bounds reading in the Linux ARP ioctl allows local users to trigger a kernel stack overread through a crafted device name. In net/ipv4/arp.c, arp_ioctl() copies an unterminated arp_dev field into a stack structure and passes it to interface-name lookup, where strcmp() reads beyond the structure. A matching alternative interface name is required; the published reproducer uses unprivileged user and network namespaces and demonstrates a KASAN report, not data extraction or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds reading in the Linux ARP ioctl allows local users to trigger a kernel stack overread through a crafted device name. In net/ipv4/arp.c, arp_ioctl() copies an unterminated arp_dev field into a stack structure and passes it to interface-name lookup, where strcmp() reads beyond the structure. A matching alternative interface name is required; the published reproducer uses unprivileged user and network namespaces and demonstrates a KASAN report, not data extraction or code execution.

The record

CVE
CVE-2026-98495
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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?

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

  1. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <1b08c5c3ac27c9ff91c5309f4a32b4e91ce2263b
  2. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <35e716a70733472ede300540082d64c33bf3b4c9
  3. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <414bbad9928598904313299ac9e037a73f520be1
  4. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <47107491b48ceef0a2faa7a010cfa961f211ef9f
  5. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <7389757d88f54237951d7497d9c4dae7cc6d64be
  6. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <ae6d704dbf9542b0a0830ec91a2db4f30307e7d8
  7. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <ba664d83638640cf454b65167339cbf20dfd6f10
  8. Affected versionversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <d8b6529e80bcb4fb8177121404cbb3377acaebd2
  9. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <1b08c5c3ac27c9ff91c5309f4a32b4e91ce2263b; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <35e716a70733472ede300540082d64c33bf3b4c9; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <414bbad9928598904313299ac9e037a73f520be1; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <47107491b48ceef0a2faa7a010cfa961f211ef9f; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <7389757d88f54237951d7497d9c4dae7cc6d64be; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <ae6d704dbf9542b0a0830ec91a2db4f30307e7d8; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <ba664d83638640cf454b65167339cbf20dfd6f10; version=36fbf1e52bd3ff8a5cb604955eedfc9350c2e6cc <d8b6529e80bcb4fb8177121404cbb3377acaebd2; version=5.5

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

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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