CVE-2026-52929 sctp: stream: fully roll back denied add-stream state

What is CVE-2026-52929?

CVE-2026-52929 is a high-severity vulnerability in Linux kernel, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-476

Which versions are affected by CVE-2026-52929?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-52929?

Apply the vendor's patch.

Is CVE-2026-52929 being exploited?

There is no known exploitation of CVE-2026-52929 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-90986, BELL-CVE-2026-52929, DEBIAN-CVE-2026-52929, GHSA-5j7v-37xj-7vhm, ROOT-OS-DEBIAN-11-CVE-2026-52929, ROOT-OS-DEBIAN-12-CVE-2026-52929 and 3 more.