CVE-2021-4460

HIGH7.1

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

Published Oct 1, 2025

Modified 6 days ago

Details

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

References

WEBhttps://git.kernel.org/stable/c/0c0356ef2498c1a250fe3846f30293f828737309 WEBhttps://git.kernel.org/stable/c/1874b0ef1426b873de94c61861e38f29a8df714c WEBhttps://git.kernel.org/stable/c/3fdc5182700910a685d23df57d65166e8556a266 WEBhttps://git.kernel.org/stable/c/50e2fc36e72d4ad672032ebf646cecb48656efe0 WEBhttps://git.kernel.org/stable/c/9069b1b542de8f3bbffef868aff41521b21485cf ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2021-4460

CVSS Analysis

CVSS v3.1

7.1

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

NoneI:N

Availability

HighA:H

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

Ecosystems

Timeline

PublishedOct 1, 2025

ModifiedJan 14, 2026