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Vulnerability record · CVE-2021-4460 · published 1 October 2025

CVE-2021-4460: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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

7.1 CVSS 3.1 High EPSS 0.16% · top 95.1% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
11 Aug 2026Last modified by NVD

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0c0356ef2498c1a250fe3846f30293f828737309 Patch
https://git.kernel.org/stable/c/1874b0ef1426b873de94c61861e38f29a8df714c Patch
https://git.kernel.org/stable/c/3fdc5182700910a685d23df57d65166e8556a266 Patch
https://git.kernel.org/stable/c/50e2fc36e72d4ad672032ebf646cecb48656efe0 Patch
https://git.kernel.org/stable/c/9069b1b542de8f3bbffef868aff41521b21485cf Patch

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Source: NIST National Vulnerability Database (record CVE-2021-4460), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.