NVD / CVE Program· CNA Linux

CVE-2025-21968: drm/amd/display: Fix slab-use-after-free on hdcp_work

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: 0.21% (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 06acfdef370ae018dad9592369e2d2fd9a40c09e, 1397715b011bcdc6ad91b17df7acaee301e89db5, 378b361e2e30e9729f9a7676f7926868d14f4326; azl3 kernel 6.6.82.1-1 on Azure Linux 3.0 6.6.85.1-2; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.180.1-1.

Low priority for now. Upgrade to Linux Linux 06acfdef370ae018dad9592369e2d2fd9a40c09e, 1397715b011bcdc6ad91b17df7acaee301e89db5, 378b361e2e30e9729f9a7676f7926868d14f4326; azl3 kernel 6.6.82.1-1 on Azure Linux 3.0 6.6.85.1-2; cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0 5.15.180.1-1 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: drm/amd/display: Fix slab-use-after-free on hdcp_work [Why] A slab-use-after-free is reported when HDCP is destroyed but the property_validate_dwork queue is still running. [How] Cancel the delayed work when destroying workqueue. (cherry picked from commit 725a04ba5a95e89c89633d4322430cfbca7ce128)

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2025-12099

Published: Apr 1, 2025
Updated: Jun 17, 2026
EPSS: 0.2% · 11th 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 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

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

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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

Affected versions

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

linux linux kernel5.5 and later · before 5.10.236
linux linux kernel5.11 and later · before 5.15.180
linux linux kernel5.16 and later · before 6.1.132
linux linux kernel6.2 and later · before 6.6.84
linux linux kernel6.7 and later · before 6.12.20
linux linux kernel6.13 and later · before 6.13.8
linux linux kernel6.14

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
- 5.5affected
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before 06acfdef370ae018dad9592369e2d2fd9a40c09eaffected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before 1397715b011bcdc6ad91b17df7acaee301e89db5affected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before 4964dbc4191ab436877a5e3ecd9c67a4e50b7c36affected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before 378b361e2e30e9729f9a7676f7926868d14f4326affected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before bac7b8b1a3f1a86eeec85835af106cbdc2b9d9f7affected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before 93d701064e56788663d7c5918fbe5e060d5df587affected · git
- da3fd7ac0bcf372cc57117bdfcd725cca7ef975a and later · before e65e7bea220c3ce8c4c793b4ba35557f4994ab2baffected · git
- before 5.5not affected · semver
- 5.10.236 and later · up to and including 5.10.*not affected · semver

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 6.1.133-1	6.1.133-1
Debian:13	linux	before 6.12.20-1	6.12.20-1

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-2025-21965Apr 1, 2025 · sched_ext: Validate prev_cpu in scx_bpf_select_cpu_dfl()
22Monitor
← EarlierCVE-2025-21966Apr 1, 2025 · dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature
31Monitor
Later →CVE-2025-21977Apr 1, 2025 · fbdev: hyperv_fb: Fix hang in kdump kernel when on Hyper-V Gen 2 VMs
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	06acfdef370ae018dad9592369e2d2fd9a40c09e	Vendor (CNA)
Linux Linux	1397715b011bcdc6ad91b17df7acaee301e89db5	Vendor (CNA)
Linux Linux	378b361e2e30e9729f9a7676f7926868d14f4326	Vendor (CNA)
Linux Linux	4964dbc4191ab436877a5e3ecd9c67a4e50b7c36	Vendor (CNA)
Linux Linux	93d701064e56788663d7c5918fbe5e060d5df587	Vendor (CNA)
Linux Linux	bac7b8b1a3f1a86eeec85835af106cbdc2b9d9f7	Vendor (CNA)
Linux Linux	e65e7bea220c3ce8c4c793b4ba35557f4994ab2b	Vendor (CNA)
azl3 kernel 6.6.82.1-1 on Azure Linux 3.0	6.6.85.1-2 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 kernel 5.15.176.3-3 on CBL Mariner 2.0	5.15.180.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.133-1 · Debian:12	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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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-primary

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

Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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

References

git.kernel.org/stable/c/06acfdef370ae018dad9592369e2d2fd9a40c09e

Show all references (8 more)

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

All records