HighCVE-2026-74469

Linux Kernel: Out-of-Bounds Write (CVE-2026-74469)

Published 15.08.2026Last modified 16.10.2026Sources: SUSE, Red Hat, Debian LTS, Ubuntu, CVE.org, Msrc Update Guide, Debian, BSI

Public exploit

What is affected, what to do

An exploit is publicly available. Update Linux Kernel to version 5.10.265, Linux Kernel to version 5.15.216, Linux Kernel to version 6.1.183.

Affected: Linux Kernel lt 4.7..5.10.265
Linux Kernel lt 5.11..5.15.216
Linux Kernel lt 5.16..6.1.183
Linux Kernel lt 6.2..6.6.151
Linux Kernel lt 6.7..6.12.103
Linux Kernel lt 6.13..6.18.44
Linux Kernel lt 6.19..7.1.8
Fixed in: Linux Kernel 5.10.265
Linux Kernel 5.15.216
Linux Kernel 6.1.183
Linux Kernel 6.6.151
Linux Kernel 6.12.103
Linux Kernel 6.18.44
Linux Kernel 7.1.8
Linux Kernel 7.2

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Metrics

7.4

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

7.4

CVSS v3

Severity High on the scale from 0 to 10.

Source: SUSE, Red Hat, Debian LTS, Ubuntu, CVE.org, Msrc Update Guide, Debian, BSI

1.5 %

EPSS score

Moderate — model estimates 1-10% exploitation likelihood.

Source: FIRST EPSS, percentile 73.5

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 103.73 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: PoC (publicly reported)
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.4 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.4
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 1.5 %; Moderate — model estimates 1-10% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 73.5; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 15.08.2026

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. An integer overflow occurs when the `transport_count` for an association exceeds its 16-bit limit, causing it to wrap around to zero. This allows a diagnostic dump to write 8 MiB of peer addresses beyond the intended memory buffer, leading to an out-of-bounds write. This memory corruption can result in a denial of service (DoS) due to system instability or crashes.

Source: suse_csaf, redhat_csaf, Debian LTS Advisories, Ubuntu Security Notices, NVD (NIST), Microsoft Security Update Guide, cvelistv5, Debian Security Advisories, BSI WID Portal, BSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Linux	Linux	`5.11 – < 5.15.216` `6.19 – < 7.1.8` `6.2 – < 6.6.151` `5.16 – < 6.1.183` `6.7 – < 6.12.103` `—` `4.7 – < 5.10.265` `6.13 – < 6.18.44`	`5.15.216` `7.1.8` `6.6.151` `6.1.183` `6.12.103` `7.2` `5.10.265` `6.18.44`

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	linux	`bookworm`
Linux	debian	linux	`trixie`
Linux	debian	linux-6.12	`bookworm`
Linux	ubuntu	linux-gcp-5.15	`focal`

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

PoC-in-GitHub (nomi-sec)	diagspill (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	18.09.2026
PoC-in-GitHub (nomi-sec)	CVE-2026-74469 (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	21.09.2026
PoC-in-GitHub (nomi-sec)	CVE-2026-74469 (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	20.09.2026

References & sources

git.kernel.orgstable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07
git.kernel.orgstable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895
git.kernel.orgstable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0
git.kernel.orgstable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75
git.kernel.orgstable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22
git.kernel.orgstable/c/b453e00da1211e997b82743d28af7714c59c05c8
git.kernel.orgstable/c/dfea32dd76f390e3155177b0038cc47b01386198
git.kernel.orgstable/c/80f48523a0fe42db2e7375dff4e38a25c117090a

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

16.10.2026Record modifiedLinux

New references:

and 4 more references

Show 16 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895
Reference	added	—	https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0
Reference	added	—	https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07
Reference	added	—	https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75
Reference	added	—	https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a
Reference	added	—	https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8
Reference	added	—	https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22
Reference	added	—	https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198
Reference	removed	https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895	—
Reference	removed	https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0	—
Reference	removed	https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07	—
Reference	removed	https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75	—
Reference	removed	https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a	—
Reference	removed	https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8	—
Reference	removed	https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22	—
Reference	removed	https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198	—

Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

16.10.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-74469","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:57:13.238914Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

19.08.2026Record modifiedLinux

New references:

Show 4 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a
Reference	added	—	https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8
Reference	added	—	https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198
Affected versions (publisher)	changed	Linux, Linux	Linux, Linux

Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

17.08.2026Record modifiedLinux
CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Show 2 original changes
Individual changes of this event as published by NVD
Type Action Before After
CVSS added
—
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected versions (publisher) changed
Linux, Linux
Linux, Linux
Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Individual changes of this event as published by NVD
Type	Action	Before	After
CVSS	added	—	AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected versions (publisher)	changed	Linux, Linux	Linux, Linux

15.08.2026ReceivedLinux

Description added or changed

New references:

and 1 more reference

Show 7 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Linux, Linux
Description	added	—	In the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.
Reference	added	—	https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895
Reference	added	—	https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0
Reference	added	—	https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07
Reference	added	—	https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75
Reference	added	—	https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22

Source identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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