CVE-2026-98123Network attack vector

Remote denial of service via unpadded parameter iteration

Published Sep 25, 2026 · Updated Sep 25, 2026

Denial of service in the Linux kernel SCTP implementation allows remote attackers to hang a host via a crafted ASCONF-ACK chunk. sctp_get_asconf_response() advances by raw parameter lengths while sctp_verify_asconf() uses four-byte padding, so an odd length desynchronizes parsing and a zero length stalls the softirq loop; short error parameters also permit an out-of-bounds read. The peer needs an ADD-IP-enabled association with an outstanding ASCONF, and the consequence is a persistent CPU soft lockup rather than memory corruption.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel SCTP implementation allows remote attackers to hang a host via a crafted ASCONF-ACK chunk. sctp_get_asconf_response() advances by raw parameter lengths while sctp_verify_asconf() uses four-byte padding, so an odd length desynchronizes parsing and a zero length stalls the softirq loop; short error parameters also permit an out-of-bounds read. The peer needs an ADD-IP-enabled association with an outstanding ASCONF, and the consequence is a persistent CPU soft lockup rather than memory corruption.

The record

CVE
CVE-2026-98123
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2cb0b0b1ed69430bf73740377ea0a1c44c50db63
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3be02999ab9131a4b96eb1eda4ca48b1cea80f03
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7ba84e2971d208a2d6413a334ec28a8a32cdce0f
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abf59d7f6fff23227256e8199aca5ade45758f8b
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2cb0b0b1ed69430bf73740377ea0a1c44c50db63; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3be02999ab9131a4b96eb1eda4ca48b1cea80f03; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7ba84e2971d208a2d6413a334ec28a8a32cdce0f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abf59d7f6fff23227256e8199aca5ade45758f8b; 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)
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.

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Technologies

Your stack

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Your stack

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