CVE-2026-52929

sctp: stream: fully roll back denied add-stream state

State: Published
Severity: 7.5 High
Published: Jun 24, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85Affected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before a6724b7b812ac8793514a1d5938db5d9d29ae725Affected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 9662eb0401518f0b4681f10e7fbf688f504f24cfAffected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 7dd9a42b044aad2dbe037db1c1e2943582485b44Affected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 39dc2b0eb5371a669ebc9ec6072b9184eac95418Affected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before d5ea0b3e261fcb2cfff142675516165244cab1daAffected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 1c6773b8c081509dcd5cd2954f2b02c50c00f151Affected 637784ade221a3c8a7ecd0f583eddd95d6276b9a to before a5f8a90ac9f77c678a9781c0a464b635e0d63e49Affected
LinuxLinux	4.15Affected before 4.15Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85Affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before a6724b7b812ac8793514a1d5938db5d9d29ae725Affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 9662eb0401518f0b4681f10e7fbf688f504f24cfAffected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 7dd9a42b044aad2dbe037db1c1e2943582485b44Affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 39dc2b0eb5371a669ebc9ec6072b9184eac95418Affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before d5ea0b3e261fcb2cfff142675516165244cab1daAffected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before 1c6773b8c081509dcd5cd2954f2b02c50c00f151Affected
637784ade221a3c8a7ecd0f583eddd95d6276b9a to before a5f8a90ac9f77c678a9781c0a464b635e0d63e49Affected

LinuxLinux

4.15Affected
before 4.15Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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