---
id: CVE-2026-74379
title: 'dax/kmem: account for partial discontiguous resource upon removal'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  dax/kmem: account for partial discontiguous resource upon removal

  When dev_dax_kmem_probe() partially succeeds (at least one range is
  mapped) but a subsequent range fa…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    ef4fc53898bd6c4d0119cc6d419ebef7f2560f31
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    d47b0b8a69a13e06afafa54723f3e8c99b0c788f
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    799e54c510a03a65a57627018a817838d72f35bd
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    598ed7393a639c7547b28ff3e14db9f1ac37c132
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    30ea97affbcce236c57287c82dc6ef7a29c63b76
  - >-
    Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 <
    8aa442cfce79e2d69e72fc8e0c0864ac2971149d
  - Linux 5.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:56:42.795588Z'
published: '2026-08-15'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:05:44.980Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74379'
references:
  - url: 'https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31'
  - url: 'https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb'
  - url: 'https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f'
  - url: 'https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd'
  - url: 'https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132'
  - url: 'https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76'
  - url: 'https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d'
tags:
  - cve.org
epss: 0.00173
epssPercentile: 0.06717
ingestedAt: '2026-11-06T18:00:12.565Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

dax/kmem: account for partial discontiguous resource upon removal

When dev_dax_kmem_probe() partially succeeds (at least one range is
mapped) but a subsequent range fails request_mem_region() or
add_memory_driver_managed(), the probe silently continues, ultimately
returning success, but with the corresponding range resource NULL'ed out.

dev_dax_kmem_remove() iterates over all dax_device ranges regardless of if
the underlying resource exists.  When remove_memory() is called later, it
returns 0 because the memory was never added which causes
dev_dax_kmem_remove() to incorrectly assume the (nonexistent) resource can
be removed and attempts cleanup on a NULL pointer.

Fix this by skipping these ranges altogether, noting that these cases are
considered success, such that the cleanup is still reached when all
actually-added ranges are successfully removed.

## Affected

- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < ef4fc53898bd6c4d0119cc6d419ebef7f2560f31`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < d47b0b8a69a13e06afafa54723f3e8c99b0c788f`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 799e54c510a03a65a57627018a817838d72f35bd`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 598ed7393a639c7547b28ff3e14db9f1ac37c132`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 30ea97affbcce236c57287c82dc6ef7a29c63b76`
- `Linux >= 60e93dc097f7f13a16a7e4b75b8803eb2adbb721 < 8aa442cfce79e2d69e72fc8e0c0864ac2971149d`
- `Linux 5.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.