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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.87% (FIRST EPSS); higher than 59.2% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85, 1c6773b8c081509dcd5cd2954f2b02c50c00f151, 39dc2b0eb5371a669ebc9ec6072b9184eac95418; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85, 1c6773b8c081509dcd5cd2954f2b02c50c00f151, 39dc2b0eb5371a669ebc9ec6072b9184eac95418; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jun 24, 2026
Updated
Oct 19, 2026
EPSS
0.8% · 59th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.15 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.15affected
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before 0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85affected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before a6724b7b812ac8793514a1d5938db5d9d29ae725affected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before 9662eb0401518f0b4681f10e7fbf688f504f24cfaffected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before 7dd9a42b044aad2dbe037db1c1e2943582485b44affected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before 39dc2b0eb5371a669ebc9ec6072b9184eac95418affected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before d5ea0b3e261fcb2cfff142675516165244cab1daaffected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before 1c6773b8c081509dcd5cd2954f2b02c50c00f151affected · git
    • 637784ade221a3c8a7ecd0f583eddd95d6276b9a and later · before a5f8a90ac9f77c678a9781c0a464b635e0d63e49affected · git
    • before 4.15not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-52927Jun 24, 2026 · netfilter: ebtables: fix OOB read in compat_mtw_from_user
    31Monitor
  • ← EarlierCVE-2026-52928Jun 24, 2026 · af_unix: Reject SIOCATMARK on non-stream sockets
    22Monitor
  • Later →CVE-2026-52930Jun 24, 2026 · ipc/shm: serialize orphan cleanup with shm_nattch updates
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0cd2dc6dce8ca47212cd306ccd52eb315ef3cf85Vendor (CNA)
Linux Linux1c6773b8c081509dcd5cd2954f2b02c50c00f151Vendor (CNA)
Linux Linux39dc2b0eb5371a669ebc9ec6072b9184eac95418Vendor (CNA)
Linux Linux7dd9a42b044aad2dbe037db1c1e2943582485b44Vendor (CNA)
Linux Linux9662eb0401518f0b4681f10e7fbf688f504f24cfVendor (CNA)
Linux Linuxa5f8a90ac9f77c678a9781c0a464b635e0d63e49Vendor (CNA)
Linux Linuxa6724b7b812ac8793514a1d5938db5d9d29ae725Vendor (CNA)
Linux Linuxd5ea0b3e261fcb2cfff142675516165244cab1daVendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.184.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.184.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.64.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-rt4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)

+18

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records