CVE-2021-47142· NVD / CVE Program· CNA Linux

drm/amdgpu: Fix a use-after-free

Noroxi assessment

Priority: Monitor (action score 22/100)

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: 0.24% (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 0707c3fea8102d211631ba515ef2159707561b0d, 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2, 3293cf3513d69f00c14d43e2020826d45ea0e46a.
Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0707c3fea8102d211631ba515ef2159707561b0d, 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2, 3293cf3513d69f00c14d43e2020826d45ea0e46a 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/amdgpu: Fix a use-after-free looks like we forget to set ttm->sg to NULL. Hit panic below [ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sg_free_table+0x17/0x20 [ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm] [ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm] [ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]

MediumCVSS 5.5 · v3.1—No exploit Fix available

BDU:2025-07354

Published: Mar 25, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 14th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.5
CNA · Linux: 7.8; 2.3 point gap

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

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.

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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 kernelbefore 4.4.271
linux linux kernel4.9.0 and later · before 4.9.271
linux linux kernel4.14.0 and later · before 4.14.235
linux linux kernel4.19.0 and later · before 4.19.193
linux linux kernel5.4.0 and later · before 5.4.124
linux linux kernel5.10.0 and later · before 5.10.42
linux linux kernel5.12.0 and later · before 5.12.9
linux linux kernel5.13

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
- 4.2affected
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before 0707c3fea8102d211631ba515ef2159707561b0daffected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before 3293cf3513d69f00c14d43e2020826d45ea0e46aaffected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before 952ab3f9f48eb0e8050596d41951cf516be6b122affected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before a849e218556f932576c0fb1c5a88714b61709a17affected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before 7398c2aab4da960761ec182d04d6d5abbb4a226eaffected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before f98cdf084405333ee2f5be548a91b2d168e49276affected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before d4ea141fd4b40636a8326df5a377d9c5cf9b3faaaffected · git
- d38ceaf99ed015f2a0b9af3499791bd3a3daae21 and later · before 1e5c37385097c35911b0f8a0c67ffd10ee1af9a2affected · git
- before 4.2not 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 5.14.6-1	5.14.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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
CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
83Now

Published before and after this one in the same product

← EarlierCVE-2021-47140Mar 25, 2024 · iommu/amd: Clear DMA ops when switching domain
21Monitor
← EarlierCVE-2021-47141Mar 25, 2024 · gve: Add NULL pointer checks when freeing irqs.
22Monitor
Later →CVE-2021-47143Mar 25, 2024 · net/smc: remove device from smcd_dev_list after failed device_add()
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	0707c3fea8102d211631ba515ef2159707561b0d	Vendor (CNA)
Linux Linux	1e5c37385097c35911b0f8a0c67ffd10ee1af9a2	Vendor (CNA)
Linux Linux	3293cf3513d69f00c14d43e2020826d45ea0e46a	Vendor (CNA)
Linux Linux	7398c2aab4da960761ec182d04d6d5abbb4a226e	Vendor (CNA)
Linux Linux	952ab3f9f48eb0e8050596d41951cf516be6b122	Vendor (CNA)
Linux Linux	a849e218556f932576c0fb1c5a88714b61709a17	Vendor (CNA)
Linux Linux	d4ea141fd4b40636a8326df5a377d9c5cf9b3faa	Vendor (CNA)
Linux Linux	f98cdf084405333ee2f5be548a91b2d168e49276	Vendor (CNA)
debian:linux	5.14.6-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0230 · Mar 26, 2024(Linux Kernel Güncellemesi)

All national notices →

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: none
Integrity: none
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
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:N/I:N/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, 10:11 PM UTC

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

References

git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d

Show all references (7 more)

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

All records