Linux Kernel up to 7.2.5 DAX dax_holder_notify_failure holder_ops null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00-

Summaryinfo

A vulnerability labeled as very critical has been found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. Impacted is the function dax_holder_notify_failure of the component DAX. The manipulation of the argument holder_ops results in null pointer dereference. This vulnerability is cataloged as CVE-2026-93073. The attack must be initiated from a local position. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. Affected is the function dax_holder_notify_failure of the component DAX. The manipulation of the argument holder_ops with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: dax: read holder_ops once in dax_holder_notify_failure() dax_holder_notify_failure() reads dax_dev->holder_ops twice without READ_ONCE() -- once for the NULL check and once for the indirect notify_failure() call. A concurrent fs_put_dax() can clear holder_ops between the two reads, so the check can observe a non-NULL pointer while the call dereferences NULL. (kill_dax() also clears holder_ops, but only after synchronize_srcu(), so it cannot race a reader that is inside dax_read_lock(); fs_put_dax() does no such synchronization.) Fetch holder_ops once into a local with READ_ONCE() so the NULL check and the indirect call observe the same value.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-93073 since 09/17/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 1661b9bf78def01a8c96409569772d9b2592f4ba/0a42180d5410c98829ee72d1d426fb7faf9e6873/ee1251621d1c7cf3155c6704542cbb358d799968/6a37acecc7c29136235cbc446a1b89e81414344b/eb412f80311fc7ab6eb3203091a3fe59a5e9fd30/7ae9d15bdcde0f2955ae13b6a95587f9e23b2359 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: 1661b9bf78def01a8c96409569772d9b2592f4ba/0a42180d5410c98829ee72d1d426fb7faf9e6873/ee1251621d1c7cf3155c6704542cbb358d799968/6a37acecc7c29136235cbc446a1b89e81414344b/eb412f80311fc7ab6eb3203091a3fe59a5e9fd30/7ae9d15bdcde0f2955ae13b6a95587f9e23b2359

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93073 (🔒)
GCVE (CVE): GCVE-0-2026-93073
GCVE (VulDB): GCVE-100-407214

Entryinfo

Created: 09/17/2026 23:50
Changes: 09/17/2026 23:50 (60)
Complete: 🔍
Cache ID: 216::103

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