CyberSecBulletin
CVE-2026-52929NVD status: Modified

Linux: NULL Pointer Dereference

Published Updated By the CyberSecBulletin desk

CVE-2026-52929 is a high-severity NULL pointer dereference vulnerability in Linux, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85, a6724b7b812ac8793514a1d5938db5d9d29ae725, 9662eb0401518f0b4681f10e7fbf688f504f24cf as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.87% chance of exploitation within 30 days, higher than 59% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 or a6724b7b812ac8793514a1d5938db5d9d29ae725 or 9662eb0401518f0b4681f10e7fbf688f504f24cf or 7dd9a42b044aad2dbe037db1c1e2943582485b44, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.259 or 5.15.210 or 6.1.176 or 6.6.143, whichever matches your release line, or a later version.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, a6724b7b812ac8793514a1d5938db5d9d29ae725; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, 9662eb0401518f0b4681f10e7fbf688f504f24cf; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, 7dd9a42b044aad2dbe037db1c1e2943582485b44; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, 39dc2b0eb5371a669ebc9ec6072b9184eac95418; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, d5ea0b3e261fcb2cfff142675516165244cab1da; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, 1c6773b8c081509dcd5cd2954f2b02c50c00f151; 637784ade221a3c8a7ecd0f583eddd95d6276b9a up to, but not including, a5f8a90ac9f77c678a9781c0a464b635e0d63e49; and 1 more ranges0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85, a6724b7b812ac8793514a1d5938db5d9d29ae725, 9662eb0401518f0b4681f10e7fbf688f504f24cf, 7dd9a42b044aad2dbe037db1c1e2943582485b44, 39dc2b0eb5371a669ebc9ec6072b9184eac95418, d5ea0b3e261fcb2cfff142675516165244cab1da
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel4.15 up to, but not including, 5.10.259; 5.11 up to, but not including, 5.15.210; 5.16 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.94; 6.13 up to, but not including, 6.18.36; 6.19 up to, but not including, 7.0.13; 7.15.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA.

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

How developers prevent this class of flaw

  • For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished.
  • Select a programming language that is not susceptible to these issues.
  • Check the results of all functions that return a value and verify that the value is non-null before acting upon it.

More NULL Pointer Dereference vulnerabilities (CWE-476)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent NULL Pointer Dereference vulnerabilities

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