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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-63971] fix race between sctp_wait_for_connect and peeloff

This high-severity Red Hat Linux advisory covers CVE-2026-63971 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-63971 Source published Source updated

VulniPulse record published Record updated

CVE-2026-63971
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

In the Linux kernel, the following vulnerability has been resolved: sctp: fix race between sctp_wait_for_connect and peeloff sctp_wait_for_connect() drops and re-acquires the socket lock while waiting for the association to reach ESTABLISHED state.

During this window, another thread can peeloff the association to a new socket via getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After re-acquiring the old socket lock, sctp_wait_for_connect() returns success without noticing the migration — the caller then accesses the association under the wrong lock in sctp_datamsg_from_user().

Add the same sk!= asoc->base.sk check that sctp_wait_for_sndbuf() already has, returning an error if the association was migrated while we slept. A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation.

A race condition exists in the sctp_wait_for_connect() function, where a socket lock is temporarily released and re-acquired. During this brief period, another process can move the SCTP association to a different socket.

This can cause subsequent operations to access memory incorrectly, potentially leading to system instability or denial of service. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-367.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.67.1.el10_2
  • kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10
  • kernel-0:4.18.0-553.162.1.el8_10
  • kernel-0:5.14.0-687.47.1.el9_8
  • RHSA-2026:85321
  • RHSA-2026:66324
  • RHSA-2026:66325
  • RHSA-2026:67150

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.67.1.el10_2, kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10, kernel-0:4.18.0-553.162.1.el8_10, kernel-0:5.14.0-687.47.1.el9_8, RHSA-2026:85321, RHSA-2026:66324. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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