drm/amdkfd: Fix UBSAN shift-out-of-bounds warning (CVE-2021-4460) | HOL Guard CVE

High · CVSS 7.1CVE-2021-4460

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

Answer in brief

CVE-2021-4460 records a High severity (CVSS 7.1) vulnerability in drm/amdkfd: Fix UBSAN shift-out-of-bounds warning. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2025Updated Aug 11, 2026Source checked Sep 25, 2026First seen by HOL Aug 11, 2026Material review Aug 11, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=35cdc81bfa94d10373ecae279f3c48ca858ac4fd <0c0356ef2498c1a250fe3846f30293f828737309 \|\| >=35cdc81bfa94d10373ecae279f3c48ca858ac4fd <1874b0ef1426b873de94c61861e38f29a8df714c \|\| >=35cdc81bfa94d10373ecae279f3c48ca858ac4fd <3fdc5182700910a685d23df57d65166e8556a266 \|\| >=35cdc81bfa94d10373ecae279f3c48ca858ac4fd <9069b1b542de8f3bbffef868aff41521b21485cf \|\| >=35cdc81bfa94d10373ecae279f3c48ca858ac4fd <50e2fc36e72d4ad672032ebf646cecb48656efe0	0c0356ef2498c1a250fe3846f30293f828737309, 1874b0ef1426b873de94c61861e38f29a8df714c, 3fdc5182700910a685d23df57d65166e8556a266, 9069b1b542de8f3bbffef868aff41521b21485cf, 50e2fc36e72d4ad672032ebf646cecb48656efe0
Linux/Linuxgeneric	5.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 0c0356ef2498c1a250fe3846f30293f828737309 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 1, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 11, 2026

Sources and claim methodology

Upstream source 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

Quoted source text, attributed separately from HOL analysis.