VulnerabilityPublished 15 Aug 2026Updated 6 Nov 2026

CVE-2026-74379: Linux kernel · dax/kmem: account for partial discontiguous resource upon removal

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ef4fc53898bd6c4d0119cc6d419ebef7f2560f31 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 18:03 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in ef4fc53898bd6c4d0119cc6d419ebef7f2560f31, d47b0b8a69a13e06afafa54723f3e8c99b0c788f, 799e54c510a03a65a57627018a817838d72f35bd +4

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31	Fixed in ef4fc53898bd6c4d0119cc6d419ebef7f2560f31
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < d47b0b8a69a13e06afafa54723f3e8c99b0c788f	Fixed in d47b0b8a69a13e06afafa54723f3e8c99b0c788f
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 799e54c510a03a65a57627018a817838d72f35bd	Fixed in 799e54c510a03a65a57627018a817838d72f35bd
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 598ed7393a639c7547b28ff3e14db9f1ac37c132	Fixed in 598ed7393a639c7547b28ff3e14db9f1ac37c132
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 30ea97affbcce236c57287c82dc6ef7a29c63b76	Fixed in 30ea97affbcce236c57287c82dc6ef7a29c63b76
LinuxLinux	Affected ≥ 60e93dc097f7f13a16a7e4b75b8803eb2adbb721, < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d	Fixed in 8aa442cfce79e2d69e72fc8e0c0864ac2971149d

AI-suggested

A fix has been implemented in the Linux kernel source code to skip non-existent resource ranges during dev_dax_kmem_remove(), preventing cleanup on NULL pointers. Users should update to the fixed kernel versions identified by the provided commit hashes to remediate this issue.

Description

A vulnerability in the Linux kernel's dax/kmem subsystem causes improper handling of partial resource allocation failures during device probing. Specifically, when dev_dax_kmem_probe() partially succeeds but fails to allocate some memory ranges, it returns success with some resources NULL. Later, dev_dax_kmem_remove() attempts to remove all ranges without checking if the resources exist, leading to cleanup on NULL pointers. This issue has been fixed by skipping non-existent ranges during removal.

Impact

The vulnerability can cause dev_dax_kmem_remove() to perform cleanup on NULL pointers due to improper handling of partially allocated resources. This may lead to kernel instability or crashes during device removal. There is no indication of remote exploitation or privilege escalation in the provided data.

Summary

The Linux kernel vulnerability CVE-2026-74379 involves the dax/kmem subsystem where dev_dax_kmem_probe() may partially succeed in mapping memory ranges but fail on subsequent ranges without signaling failure. This results in some resource pointers being NULL. Subsequently, dev_dax_kmem_remove() iterates over all ranges and attempts to remove resources even if they were never added, causing cleanup operations on NULL pointers. The fix ensures that removal skips ranges with NULL resources, preventing invalid memory operations during cleanup.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 18:03 UTC

Technical details

References

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