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Vulnerability record · CVE-2026-52929 · published 24 June 2026

CVE-2026-52929: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.47% · top 62.1% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 Patch
https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 Patch
https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 Patch
https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 Patch
https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf Patch
https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49 Patch
https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 Patch
https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da Patch

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Source: NIST National Vulnerability Database (record CVE-2026-52929), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.