Linux Kernel SCTP network stack Null Pointer Dereference Rated 7.5 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-52929

Key Details

CVE	CVE-2026-52929
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classified as	CWE-476 (NULL Pointer Dereference)
Exploitation prediction (EPSS)	0.53% probability of exploitation in the next 30 days (43% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's and Siemens's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-52929
CVE	https://www.cve.org/CVERecord?id=CVE-2026-52929

Source

Reference

NVD

CVE