HighCVE-2026-45984

Linux Kernel: Use-After-Free (CVE-2026-45984)

Published 27.05.2026Last modified 19.10.2026Sources: Ubuntu, Debian LTS, BSI, SUSE, Red Hat, CVE.org, EUVD

What is affected, what to do

A flaw was found in the Linux kernel's GFS2 filesystem. This memory corruption vulnerability, a use-after-free, occurs in the iomap inline data write path.

Update Linux Kernel to version 5.10.252, Linux Kernel to version 5.15.202, Linux Kernel to version 6.1.165.

Affected: Linux Kernel lt 5.2..5.10.252
Linux Kernel lt 5.11..5.15.202
Linux Kernel lt 5.16..6.1.165
Linux Kernel lt 6.2..6.6.128
Linux Kernel lt 6.7..6.12.75
Linux Kernel lt 6.13..6.18.14
Linux Kernel lt 6.19..6.19.4
Linux Kernel lt 6.20..7.0
Fixed in: Linux Kernel 5.10.252
Linux Kernel 5.15.202
Linux Kernel 6.1.165
Linux Kernel 6.6.128
Linux Kernel 6.12.75
Linux Kernel 6.18.14
Linux Kernel 6.19.4
Linux Kernel 7.0

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.8

Priority

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

Source: NVD, CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

Source: Ubuntu, Debian LTS, BSI, SUSE, Red Hat, CVE.org, EUVD

0.2 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 8.0

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: 57.11 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: no public PoC known
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: 7.8 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: 7.8
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: 0.2 %; Low — model estimates < 1% 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: 8.0; Low — this CVE sits in the lower 10% of all CVEs scored today.
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: 27.05.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 16 October 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-826

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 Linux kernel's GFS2 filesystem. This memory corruption vulnerability, a use-after-free, occurs in the iomap inline data write path. The issue arises because a data buffer is released prematurely while still being referenced, leading to a write to freed memory. This could allow a local attacker to cause system instability or a denial of service (DoS).

Source: Ubuntu Security Notices, Debian LTS Advisories, BSI WID Portal, BSI CSAF, suse_csaf, redhat_csaf, cvelistv5, NVD (NIST), ENISA EUVD, CVE.org (MITRE)

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	`5.16 – < 6.1.165` `6.7 – < 6.12.75` `6.19 – < 6.19.4` `5.2 – < 5.10.252` `6.20 – < 7.0` `5.11 – < 5.15.202` `6.2 – < 6.6.128` `6.13 – < 6.18.14`	`6.1.165` `6.12.75` `6.19.4` `5.10.252` `7.0` `5.15.202` `6.6.128` `6.18.14`
IBM	QRadar SIEM	`<7.5.0 UP15 IF06`	—

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	linux	`bullseye`
Linux	linux	linux_kernel	—

Weakness classes (CWE)

CWE-826Premature Release of Resource During Expected Lifetime
Base
The product releases a resource that is still intended to be used by itself or another actor.
Entry at MITRE CWE-826

References & sources

git.kernel.orgstable/c/1403989d1b502f4a2c0d0b42ccf1c25748442effeuvd, Patch
git.kernel.orgstable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142euvd, Patch
git.kernel.orgstable/c/764c3c84b5683e608f43735c803a5f415046686ceuvd, Patch
git.kernel.orgstable/c/d87268326b277af3665237ac76a73dd9fa8e21b4euvd, Patch
git.kernel.orgstable/c/87d4954b5c59735a99ea98cb208d47130f6dce7deuvd, Patch
git.kernel.orgstable/c/6d76febba07c40bcf358f63216d36ea68cf1c215euvd, Patch
git.kernel.orgstable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19deuvd, Patch
git.kernel.orgstable/c/faddeb848305e79db89ee0479bb0e33380656321euvd, Patch
access.redhat.comsecurity/cve/CVE-2026-45984Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2481922Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-45984.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:51603Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36767Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:38902Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:27789Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:33743Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35894Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36049Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:51604Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:55444Vendor advisory, x_refsource_REDHAT

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).

19.10.2026Record modifiedCISA ADP
Weakness type: CWE-826
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-826
Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-826

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-2026-45984","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:18:45.464799Z"}

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

01.09.2026Record modifiedLinux

New references:

and 4 more references

Show 24 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff
Reference	added	—	https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142
Reference	added	—	https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215
Reference	added	—	https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c
Reference	added	—	https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d
Reference	added	—	https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d
Reference	added	—	https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4
Reference	added	—	https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321
Reference	removed	https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff	—
Reference	removed	https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142	—
Reference	removed	https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215	—
Reference	removed	https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c	—
Reference	removed	https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d	—
Reference	removed	https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d	—
Reference	removed	https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4	—
Reference	removed	https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321	—
Reference type	removed	https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4 Types: Patch	—
Reference type	removed	https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321 Types: Patch	—

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

01.09.2026Record modifiedRed Hat ADP

New references:

and 8 more references

Show 40 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/45xxx/CVE-2026-45984.json">CVE-2026-45984</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:27789
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:33743
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35894
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36049
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36767
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:38902
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:51603
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:51604
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:55444
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59143
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59145
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59146
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59147
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59148
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59149
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:61692
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-45984
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2481922
Reference	added	—	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45984.json
Reference	removed	https://access.redhat.com/errata/RHSA-2026:27789	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:33743	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:35894	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36049	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:36767	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:38902	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:51603	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:51604	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:55444	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59142	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59143	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59145	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59146	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59147	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59148	—
Reference	removed	https://access.redhat.com/errata/RHSA-2026:59149	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-45984	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2481922	—
Reference	removed	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45984.json	—

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

25.08.2026Record modifiedRed Hat ADP

New references:

and 3 more references

Show 7 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59142
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59143
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59145
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59146
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59147
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59148
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59149

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Show 3 older changes

24.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (+14)	Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (+16)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

09.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:36767

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36767
Affected versions (publisher)	changed	Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux BaseOS AUS (v.8.6) (+14)	Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 8) (+18)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

16.06.2026Initial analysis by NVDNVD

Newly listed as affected:

Linux Kernel (6.13 – before 6.18.14; 6.19 – before 6.19.4; 6.2 – before 6.6.128; 6.7 – before 6.12.75; 5.11 – before 5.15.202; 5.16 – before 6.1.165; 5.2 – before 5.10.252)

Weakness type: CWE-416

New references:

and 4 more references

Show 10 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-416
Product configuration	added	—	OR cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.18.14 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.19 up to (excluding) 6.19.4 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.128 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.75 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.11 up to (excluding) 5.15.202 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.16 up to (excluding) 6.1.165 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 5.2 up to (excluding) 5.10.252
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/1403989d1b502f4a2c0d0b42ccf1c25748442eff Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/1cae1bafdf9caa9b462b19af06b1a06902e4e142 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/6d76febba07c40bcf358f63216d36ea68cf1c215 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/764c3c84b5683e608f43735c803a5f415046686c Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/815ddd27c0c7171a99fe802fdb19098ddef8b19d Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/87d4954b5c59735a99ea98cb208d47130f6dce7d Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/d87268326b277af3665237ac76a73dd9fa8e21b4 Types: Patch
Reference type	added	—	kernel.org: https://git.kernel.org/stable/c/faddeb848305e79db89ee0479bb0e33380656321 Types: Patch

Source identifier: nvd@nist.gov

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-45984"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-45984.svg?lang=en" alt="CVE-2026-45984 – NEOSEC Intel" height="20"></a>