CVE-2026-98158Network attack vectorHinoki check available

Kernel panic via reused zero-headroom PPP frame

Published Sep 25, 2026 · Updated Sep 25, 2026

Out-of-bounds access in Linux ppp_async allows remote attackers controlling a configured PPP peer to crash the kernel with crafted frames. process_input_packet() reuses an errored skb after removing its headroom, so a later tag push writes below skb->head and CCP can read before it. Exploitation requires root to configure PPP and control of its peer; the demonstrated consequence is a kernel panic.

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

Out-of-bounds access in Linux ppp_async allows remote attackers controlling a configured PPP peer to crash the kernel with crafted frames. process_input_packet() reuses an errored skb after removing its headroom, so a later tag push writes below skb->head and CCP can read before it. Exploitation requires root to configure PPP and control of its peer; the demonstrated consequence is a kernel panic.

The record

CVE
CVE-2026-98158
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

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=2.6.15
  2. Affected versionversion=6722e78c90054101e6797d5944cdc81af9897a0a <0c53eb14975f029abd6b26896a460f0d2aaefe6b
  3. Affected versionversion=6722e78c90054101e6797d5944cdc81af9897a0a <717137221c7d90e7c98bda9a370c9da6cbf015e5
  4. Affected versionversion=6722e78c90054101e6797d5944cdc81af9897a0a <8dc5d98a16fa23c00999aecf10018c9f69fa5bf4
  5. Affected versionversion=6722e78c90054101e6797d5944cdc81af9897a0a <d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.15; version=6722e78c90054101e6797d5944cdc81af9897a0a <0c53eb14975f029abd6b26896a460f0d2aaefe6b; version=6722e78c90054101e6797d5944cdc81af9897a0a <717137221c7d90e7c98bda9a370c9da6cbf015e5; version=6722e78c90054101e6797d5944cdc81af9897a0a <8dc5d98a16fa23c00999aecf10018c9f69fa5bf4; version=6722e78c90054101e6797d5944cdc81af9897a0a <d0fc3dabfe67caf084e7119ceb2ee23f5ad2f2da

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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