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NVD / CVE Program· CNA Linux

CVE-2021-47657: drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_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: 0.27% (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 5.12, 5.13, 6b79f96f4a23846516e5e6e4dd37fc06f43a60dd.

Low priority for now. Upgrade to Linux Linux 5.12, 5.13, 6b79f96f4a23846516e5e6e4dd37fc06f43a60dd 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/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free() If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it happened in the bug report by syzbot), virtio_gpu_array_put_free() could be called with objs equal to NULL. Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise return from the function.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

22

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.

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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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
linuxlinux kernel

Affected versions

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

  • linux linux kernel5.11.20 and later · before 5.12
  • linux linux kernel5.12.3 and later · before 5.15.32
  • linux linux kernel5.16 and later · before 5.16.18
  • linux linux kernel5.17 and later · before 5.17.1

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

    • 244dbb4abe123779ec30e7c6ca283a681aba5c94, 1016c0f62f73d5d2c3a5d1ad1e1fb0cdce1993ae, 5.13affected
    • 377f8331d0565e6f71ba081c894029a92d0c7e77 and later · before b094fece3810c71ceee6f0921676cb65d4e68c5aaffected · git
    • 377f8331d0565e6f71ba081c894029a92d0c7e77 and later · before ac92b474eeeed75b8660374ba1d129a121c09da8affected · git
    • 377f8331d0565e6f71ba081c894029a92d0c7e77 and later · before abc9ad36df16e27ac1c665085157f1a082d39bacaffected · git
    • 377f8331d0565e6f71ba081c894029a92d0c7e77 and later · before 6b79f96f4a23846516e5e6e4dd37fc06f43a60ddaffected · git
    • 5.11.20 and later · before 5.12affected · semver
    • 5.12.3 and later · before 5.13affected · semver
    • before 5.13not affected · semver
    • 5.15.32 and later · up to and including 5.15.*not affected · semver
    • 5.16.18 and later · up to and including 5.16.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1
Red Hat:enterprise_linux:8::baseosbpftoolbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseosbpftool-debuginfobefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernelbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-abi-stablelistsbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-corebefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debugbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debug-corebefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debug-debuginfobefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debug-develbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debug-modulesbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debug-modules-extrabefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debuginfobefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-aarch64before 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-ppc64lebefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-s390xbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-develbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-docbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-modulesbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-modules-extrabefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-toolsbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-tools-debuginfobefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8
Red Hat:enterprise_linux:8::baseoskernel-tools-libsbefore 0:4.18.0-425.3.1.el80:4.18.0-425.3.1.el8

+48

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
    90Now
  • 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-2021-47655Feb 26, 2025 · media: venus: vdec: fixed possible memory leak issue
    22Monitor
  • ← EarlierCVE-2021-47656Feb 26, 2025 · jffs2: fix use-after-free in jffs2_clear_xattr_subsystem
    31Monitor
  • Later →CVE-2021-47658Feb 26, 2025 · drm/amd/pm: fix a potential gpu_metrics_table memory leak
    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 / packageFixed versionSource
Linux Linux5.12Vendor (CNA)
Linux Linux5.13Vendor (CNA)
Linux Linux6b79f96f4a23846516e5e6e4dd37fc06f43a60ddVendor (CNA)
Linux Linuxabc9ad36df16e27ac1c665085157f1a082d39bacVendor (CNA)
Linux Linuxac92b474eeeed75b8660374ba1d129a121c09da8Vendor (CNA)
Linux Linuxb094fece3810c71ceee6f0921676cb65d4e68c5aVendor (CNA)
debian:linux5.17.3-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-425.3.1.el8 · Red Hat:enterprise_linux:8::baseosPackage 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
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-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

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

  1. Fix✗ → ✓

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

References

Show all references (3 more)

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

All records