CVE-2026-98548Network attack vectorHinoki check available

Kernel memory corruption via stale-cookie transport reuse

Published Oct 18, 2026 · Updated Oct 18, 2026

Use-after-free in Linux SCTP allows remote attackers to corrupt kernel memory through crafted peer traffic during association setup. The sctp_assoc_bh_rcv() function retains a removed transport in last_data_from after stale-cookie processing, leaving subsequent SACK handling to access freed memory. Exposure requires SCTP peer interaction during the COOKIE-ECHOED state; local users can also trigger it without capabilities, but code execution is not established.

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

Use-after-free in Linux SCTP allows remote attackers to corrupt kernel memory through crafted peer traffic during association setup. The sctp_assoc_bh_rcv() function retains a removed transport in last_data_from after stale-cookie processing, leaving subsequent SACK handling to access freed memory. Exposure requires SCTP peer interaction during the COOKIE-ECHOED state; local users can also trigger it without capabilities, but code execution is not established.

The record

CVE
CVE-2026-98548
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cd246b214dc9acf4e2f11d58c035e1e672fe7d2
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4498467a8af06cfa3d71cb04bd7c4170dec8f449
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6df536c5acbc0abd6f119d02e24f4a2ed97707f4
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <854c053c71459f8db7ef07db9cfa4eec5f5206f2
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <965e21ea16acb394d5e5801998ca9b0adc669665
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0af3fd150fdc43821df3bb77e5ec74faf4dfc7a
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d68c9287b3ca0d6faadc61fbcb18d1a6b5493321
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ec23855274a73906b02f0d124fefd9cb3c008b1d
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1cd246b214dc9acf4e2f11d58c035e1e672fe7d2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4498467a8af06cfa3d71cb04bd7c4170dec8f449; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6df536c5acbc0abd6f119d02e24f4a2ed97707f4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <854c053c71459f8db7ef07db9cfa4eec5f5206f2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <965e21ea16acb394d5e5801998ca9b0adc669665; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c0af3fd150fdc43821df3bb77e5ec74faf4dfc7a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d68c9287b3ca0d6faadc61fbcb18d1a6b5493321; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ec23855274a73906b02f0d124fefd9cb3c008b1d; 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

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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