CVE-2026-52929
sctp: stream: fully roll back denied add-stream state
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.
INFO
Published Date :
June 24, 2026, 8:16 a.m.
Last Modified :
July 8, 2026, 3:28 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest version.
- Apply the provided patch for sctp: stream: fully roll back denied add-stream state.
- Rebuild and reinstall the kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-52929.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-52929 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-52929
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-52929 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-52929 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.176 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.143 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.210 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.13 *cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 5.10.259 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': '0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': 'a6724b7b812ac8793514a1d5938db5d9d29ae725', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': '9662eb0401518f0b4681f10e7fbf688f504f24cf', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': '7dd9a42b044aad2dbe037db1c1e2943582485b44', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': '39dc2b0eb5371a669ebc9ec6072b9184eac95418', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': 'd5ea0b3e261fcb2cfff142675516165244cab1da', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': '1c6773b8c081509dcd5cd2954f2b02c50c00f151', 'versionType': 'git'}, {'status': 'affected', 'version': '637784ade221a3c8a7ecd0f583eddd95d6276b9a', 'lessThan': 'a5f8a90ac9f77c678a9781c0a464b635e0d63e49', 'versionType': 'git'}], 'programFiles': ['net/sctp/stream.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.15'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.15', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.259', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.210', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.176', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.143', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.94', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.36', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.13', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sctp/stream.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85 Added Reference https://git.kernel.org/stable/c/1c6773b8c081509dcd5cd2954f2b02c50c00f151 Added Reference https://git.kernel.org/stable/c/39dc2b0eb5371a669ebc9ec6072b9184eac95418 Added Reference https://git.kernel.org/stable/c/7dd9a42b044aad2dbe037db1c1e2943582485b44 Added Reference https://git.kernel.org/stable/c/9662eb0401518f0b4681f10e7fbf688f504f24cf Added Reference https://git.kernel.org/stable/c/a5f8a90ac9f77c678a9781c0a464b635e0d63e49 Added Reference https://git.kernel.org/stable/c/a6724b7b812ac8793514a1d5938db5d9d29ae725 Added Reference https://git.kernel.org/stable/c/d5ea0b3e261fcb2cfff142675516165244cab1da