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NVD / CVE Program· CNA Linux

CVE-2021-4460: drm/amdkfd: Fix UBSAN shift-out-of-bounds warning

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.16% (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 0c0356ef2498c1a250fe3846f30293f828737309, 1874b0ef1426b873de94c61861e38f29a8df714c, 3fdc5182700910a685d23df57d65166e8556a266.

Low priority for now. Upgrade to Linux Linux 0c0356ef2498c1a250fe3846f30293f828737309, 1874b0ef1426b873de94c61861e38f29a8df714c, 3fdc5182700910a685d23df57d65166e8556a266 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/amdkfd: Fix UBSAN shift-out-of-bounds warning If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up doing a shift operation where the number of bits shifted equals number of bits in the operand. This behaviour is undefined. Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the count is >= number of bits in the operand. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Oct 1, 2025
Updated
Aug 11, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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

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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 kernelbefore 5.4.118
  • linux linux kernel5.5 and later · before 5.10.36
  • linux linux kernel5.11 and later · before 5.11.20
  • linux linux kernel5.12 and later · before 5.12.3

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

    • 5.4affected
    • 35cdc81bfa94d10373ecae279f3c48ca858ac4fd and later · before 0c0356ef2498c1a250fe3846f30293f828737309affected · git
    • 35cdc81bfa94d10373ecae279f3c48ca858ac4fd and later · before 1874b0ef1426b873de94c61861e38f29a8df714caffected · git
    • 35cdc81bfa94d10373ecae279f3c48ca858ac4fd and later · before 3fdc5182700910a685d23df57d65166e8556a266affected · git
    • 35cdc81bfa94d10373ecae279f3c48ca858ac4fd and later · before 9069b1b542de8f3bbffef868aff41521b21485cfaffected · git
    • 35cdc81bfa94d10373ecae279f3c48ca858ac4fd and later · before 50e2fc36e72d4ad672032ebf646cecb48656efe0affected · git
    • before 5.4not affected · semver
    • 5.4.118 and later · up to and including 5.4.*not affected · semver
    • 5.10.36 and later · up to and including 5.10.*not affected · semver
    • 5.11.20 and later · up to and including 5.11.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.10.38-15.10.38-1
Red Hat:rhel_aus:8.2::baseosbpftoolbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseosbpftool-debuginfobefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernelbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-abi-whitelistsbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-corebefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debugbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-corebefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-debuginfobefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-develbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modulesbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modules-extrabefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfobefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-develbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-docbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modulesbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modules-extrabefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-toolsbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-debuginfobefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-libsbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseosperfbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseosperf-debuginfobefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2
Red Hat:rhel_aus:8.2::baseospython3-perfbefore 0:4.18.0-193.193.1.el8_20:4.18.0-193.193.1.el8_2

+41

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-2025-39891Oct 1, 2025 · wifi: mwifiex: Initialize the chan_stats array to zero
    28Monitor
  • ← EarlierCVE-2025-39892Oct 1, 2025 · ASoC: soc-core: care NULL dirver name on snd_soc_lookup_component_nolocked()
    22Monitor
  • Later →CVE-2025-39893Oct 1, 2025 · spi: spi-qpic-snand: unregister ECC engine on probe error and device remove
    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 Linux0c0356ef2498c1a250fe3846f30293f828737309Vendor (CNA)
Linux Linux1874b0ef1426b873de94c61861e38f29a8df714cVendor (CNA)
Linux Linux3fdc5182700910a685d23df57d65166e8556a266Vendor (CNA)
Linux Linux50e2fc36e72d4ad672032ebf646cecb48656efe0Vendor (CNA)
Linux Linux9069b1b542de8f3bbffef868aff41521b21485cfVendor (CNA)
debian:linux5.10.38-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-193.193.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
suse:kernel-64kb5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-default5.3.18-150300.59.221.1 · SUSE:Linux Enterprise Live Patching 15 SP3Package registry (OSV)
suse:kernel-default-base5.3.18-150300.59.221.1.150300.18.132.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-docs5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP3_Update_621-150300.7.3.1 · SUSE:Linux Enterprise Live Patching 15 SP3Package registry (OSV)
suse:kernel-obs-build5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-preempt5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-rt5.3.18-150300.223.1 · SUSE:Linux Enterprise Micro 5.1Package registry (OSV)
suse:kernel-source5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-source-rt5.3.18-150300.223.1 · SUSE:Linux Enterprise Micro 5.1Package registry (OSV)
suse:kernel-syms5.3.18-150300.59.221.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)
suse:kernel-zfcpdump5.3.18-150300.59.221.1 · SUSE:Linux Enterprise Server 15 SP3-LTSSPackage 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
none
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
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (4 more)

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

All records