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

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00023.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
4a488a7ad71401169cecee75dc94bcce642e2c53 affected < 0c0356ef2498c1a250fe3846f30293f828737309
4a488a7ad71401169cecee75dc94bcce642e2c53 affected < 1874b0ef1426b873de94c61861e38f29a8df714c
4a488a7ad71401169cecee75dc94bcce642e2c53 affected < 3fdc5182700910a685d23df57d65166e8556a266
4a488a7ad71401169cecee75dc94bcce642e2c53 affected < 9069b1b542de8f3bbffef868aff41521b21485cf
4a488a7ad71401169cecee75dc94bcce642e2c53 affected < 50e2fc36e72d4ad672032ebf646cecb48656efe0
Linux Linux affected
Version Status Constraints
3.19 affected —
0 unaffected < 3.19
5.4.118 unaffected ≤ 5.4.*
5.10.36 unaffected ≤ 5.10.*
5.11.20 unaffected ≤ 5.11.*
5.12.3 unaffected ≤ 5.12.*
5.13 unaffected ≤ *

Configuration 1 [-]

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/0c0356ef2498c1a250fe3846f30293f828737309 cve-icon cve-icon
https://git.kernel.org/stable/c/1874b0ef1426b873de94c61861e38f29a8df714c cve-icon cve-icon
https://git.kernel.org/stable/c/3fdc5182700910a685d23df57d65166e8556a266 cve-icon cve-icon
https://git.kernel.org/stable/c/50e2fc36e72d4ad672032ebf646cecb48656efe0 cve-icon cve-icon
https://git.kernel.org/stable/c/9069b1b542de8f3bbffef868aff41521b21485cf cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025100114-CVE-2021-4460-aa71@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2021-4460 cve-icon
https://www.cve.org/CVERecord?id=CVE-2021-4460 cve-icon
History

Wed, 14 Jan 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 10 Dec 2025 17:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-125
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}

Thu, 02 Oct 2025 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Thu, 02 Oct 2025 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate

Wed, 01 Oct 2025 12:00:00 +0000

Type Values Removed Values Added
Description 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
Title drm/amdkfd: Fix UBSAN shift-out-of-bounds warning
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-01-14T17:42:45.892Z

Reserved: 2025-10-01T11:38:13.842Z

Link: CVE-2021-4460

cve-icon Vulnrichment

Updated: 2026-01-14T17:39:26.550Z

cve-icon NVD

Status : Modified

Published: 2025-10-01T12:15:31.850

Modified: 2026-01-14T18:16:27.280

Link: CVE-2021-4460

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-10-01T00:00:00Z

Links: CVE-2021-4460 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-10-02T08:39:43Z

Weaknesses