NVD / CVE Program· CNA Linux

CVE-2026-46280: lib: test_hmm: evict device pages on file close to avoid use-after-free

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 234071b4318feaeb27cd2e4e1b16ef6b055adf89, 38f113f81d3f0adc658a4475dd3ecaec985e21d3, 5846715b6382dd4c6a69b35a56ca6115d33bc2a0; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.

Low priority for now. Upgrade to Linux Linux 234071b4318feaeb27cd2e4e1b16ef6b055adf89, 38f113f81d3f0adc658a4475dd3ecaec985e21d3, 5846715b6382dd4c6a69b35a56ca6115d33bc2a0; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: lib: test_hmm: evict device pages on file close to avoid use-after-free Patch series "Minor hmm_test fixes and cleanups". Two bugfixes a cleanup for the HMM kernel selftests. These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems. This patch (of 3): When dmirror_fops_release() is called it frees the dmirror struct but doesn't migrate device private pages back to system memory first. This leaves those pages with a dangling zone_device_data pointer to the freed dmirror. If a subsequent fault occurs on those pages (eg. during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic. This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages. Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct. The function is moved earlier in the file to avoid a forward declaration.

Memory safety

openSUSE-SU-2026:11014-1

Published: Jun 8, 2026
Updated: Oct 19, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.8affected
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 234071b4318feaeb27cd2e4e1b16ef6b055adf89affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before bf477abd448c76bb8ea51c9b4f63a3a17c4b6239affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 5846715b6382dd4c6a69b35a56ca6115d33bc2a0affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 38f113f81d3f0adc658a4475dd3ecaec985e21d3affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1affected · git
- b2ef9f5a5cb37643ca5def3516c546457074b882 and later · before 744dd97752ef1076a8d8672bb0d8aa2c7abc1144affected · git
- before 5.8not affected · semver
- 6.1.176 and later · up to and including 6.1.*not affected · semver
- 6.6.140 and later · up to and including 6.6.*not affected · semver

Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel5.8 and later · before 6.1.176
linux linux kernel6.2 and later · before 6.6.140
linux linux kernel6.7 and later · before 6.12.86
linux linux kernel6.13 and later · before 6.18.27
linux linux kernel6.19 and later · before 7.0.4

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.86-1	6.12.86-1
Debian:14	linux	before 7.0.4-1	7.0.4-1
openSUSE:Tumbleweed	kernel-source	before 7.0.12-1.1	7.0.12-1.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
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CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-46275Jun 8, 2026 · Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths
31Monitor
← EarlierCVE-2026-46276Jun 8, 2026 · drm/amdgpu: fix zero-size GDS range init on RDNA4
22Monitor
Later →CVE-2026-46282Jun 8, 2026 · iio: frequency: admv1013: fix NULL pointer dereference on str
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	234071b4318feaeb27cd2e4e1b16ef6b055adf89	Vendor (CNA)
Linux Linux	38f113f81d3f0adc658a4475dd3ecaec985e21d3	Vendor (CNA)
Linux Linux	5846715b6382dd4c6a69b35a56ca6115d33bc2a0	Vendor (CNA)
Linux Linux	744dd97752ef1076a8d8672bb0d8aa2c7abc1144	Vendor (CNA)
Linux Linux	9de1eb0aac2862d6144b8db0ec1388e79f8bc3e1	Vendor (CNA)
Linux Linux	bf477abd448c76bb8ea51c9b4f63a3a17c4b6239	Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.0	6.6.141.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · Debian:12	Package registry (OSV)
opensuse:kernel-source	7.0.12-1.1 · openSUSE:Tumbleweed	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log (2)

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/234071b4318feaeb27cd2e4e1b16ef6b055adf89

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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