In the Linux kernel, the following vulnerability has been resolved: sctp: clear new_transport when removing a peer sctp_process_asconf_param()… (CVE-2026-74586)
A use-after-free vulnerability in the Linux kernel SCTP implementation was resolved by clearing a pointer to a removed transport before it is used. The flaw allowed an authenticated SCTP peer to trigger a condition where a HEARTBEAT message references a freed transport, leading to a potential kernel memory access violation.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel SCTP subsystem involves improper handling of the new_transport pointer during processing of ASCONF chunks. An authenticated SCTP peer can add and remove a transport in the same ASCONF chunk, causing the new_transport pointer to reference a freed transport. Subsequent HEARTBEAT message creation uses this stale pointer without holding a reference, resulting in a use-after-free condition detected by KASAN. The issue was fixed by clearing the new_transport pointer when its associated peer transport is removed, preventing access to freed memory.
Potential Impact
This vulnerability can cause a kernel use-after-free memory access, potentially leading to kernel crashes or undefined behavior. Exploitation requires an authenticated SCTP peer. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to clear the new_transport pointer when its peer transport is removed, preventing use-after-free. Users should apply the official kernel updates that include this patch. Patch status is not explicitly stated here; check the vendor advisory or Linux kernel mailing lists for the specific fixed versions and updates.
In the Linux kernel, the following vulnerability has been resolved: sctp: clear new_transport when removing a peer sctp_process_asconf_param()… (CVE-2026-74586)
Description
A use-after-free vulnerability in the Linux kernel SCTP implementation was resolved by clearing a pointer to a removed transport before it is used. The flaw allowed an authenticated SCTP peer to trigger a condition where a HEARTBEAT message references a freed transport, leading to a potential kernel memory access violation.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel SCTP subsystem involves improper handling of the new_transport pointer during processing of ASCONF chunks. An authenticated SCTP peer can add and remove a transport in the same ASCONF chunk, causing the new_transport pointer to reference a freed transport. Subsequent HEARTBEAT message creation uses this stale pointer without holding a reference, resulting in a use-after-free condition detected by KASAN. The issue was fixed by clearing the new_transport pointer when its associated peer transport is removed, preventing access to freed memory.
Potential Impact
This vulnerability can cause a kernel use-after-free memory access, potentially leading to kernel crashes or undefined behavior. Exploitation requires an authenticated SCTP peer. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to clear the new_transport pointer when its peer transport is removed, preventing use-after-free. Users should apply the official kernel updates that include this patch. Patch status is not explicitly stated here; check the vendor advisory or Linux kernel mailing lists for the specific fixed versions and updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-p4vf-g6h3-f897
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-74586"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a8a27f3acd9273b499bc8ba
Added to database: 08/22/2026, 22:51:31 UTC
Last enriched: 08/22/2026, 23:10:12 UTC
Last updated: 08/23/2026, 01:46:28 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.