In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 cve-icon
https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 cve-icon
https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 cve-icon
https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 cve-icon
https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf cve-icon
https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49 cve-icon
https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 cve-icon
https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da cve-icon
https://lore.kernel.org/linux-cve-announce/2026062432-CVE-2026-52929-63ee@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-52929 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-52929 cve-icon
History

Thu, 25 Jun 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 24 Jun 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Wed, 24 Jun 2026 07:45:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: sctp: stream: fully roll back denied add-stream state When ADD_OUT_STREAMS is denied, SCTP only shrinks the queued chunks and then lowers outcnt. That leaves removed stream metadata behind, so a later re-add can reuse a stale ext and hit a null-pointer dereference in the scheduler get path. Fix the rollback by tearing down the removed stream state the same way other stream resizes do. Unschedule the current scheduler state, drop the removed stream ext state with sctp_stream_outq_migrate(), and then reschedule the remaining streams. This keeps scheduler-private RR/FC/PRIO lists consistent while fully rolling back denied outgoing stream additions.
Title sctp: stream: fully roll back denied add-stream state
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-06-24T07:14:22.020Z

Updated: 2026-06-24T07:14:22.020Z

Reserved: 2026-06-09T07:44:35.368Z

Link: CVE-2026-52929

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-06-24T00:00:00Z

Links: CVE-2026-52929 - Bugzilla