CVE-2026-74586Network attack vector

Host crash via dangling SCTP transport pointer

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in the Linux kernel SCTP implementation allows remote attackers in an established association to crash the host. A wildcard DEL-IP can remove a newly added transport without clearing asoc->new_transport, so a queued HEARTBEAT later reads freed transport state. An SCTP-AUTH peer and local address replacement are required; the demonstrated consequence is a kernel oops and host crash.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel SCTP implementation allows remote attackers in an established association to crash the host. A wildcard DEL-IP can remove a newly added transport without clearing asoc->new_transport, so a queued HEARTBEAT later reads freed transport state. An SCTP-AUTH peer and local address replacement are required; the demonstrated consequence is a kernel oops and host crash.

The record

CVE
CVE-2026-74586
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.2
  2. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <163847552a571bd55094291f4ffcdc1de0f14a7b
  3. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <291accf36febce751021888de5f15090f4875b56
  4. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <31efa656cf6aface26e88f038c14f22ee6ca1500
  5. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <3b539b317cd052236fed0350364ff1268996ba46
  6. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3
  7. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <c0f973bb5118dd1b146cda3fcc8af6f6057befec
  8. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <ca33df36aa0143a1d04f57d2086020c12e7eddb7
  9. Affected versionversion=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <db9d8e3b670f841755bc2018f178472dc6064d27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <163847552a571bd55094291f4ffcdc1de0f14a7b; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <291accf36febce751021888de5f15090f4875b56; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <31efa656cf6aface26e88f038c14f22ee6ca1500; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <3b539b317cd052236fed0350364ff1268996ba46; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <c0f973bb5118dd1b146cda3fcc8af6f6057befec; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <ca33df36aa0143a1d04f57d2086020c12e7eddb7; version=6af29ccc223b0feb6fc6112281c3fa3cdb1afddf <db9d8e3b670f841755bc2018f178472dc6064d27

Published CVSS scores

9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499.004Endpoint Denial of Service: Application 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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