Improper Resource Locking Affecting kernel6.12-libbpf-debuginfo package, versions <1:6.12.77-99.140.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.34% (26th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNEL612LIBBPFDEBUGINFO-16709028
  • published16 May 2026
  • disclosed6 May 2026

Introduced: 6 May 2026

CVE-2026-43253  (opens in a new tab)
CWE-413  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel6.12-libbpf-debuginfo to version 1:6.12.77-99.140.amzn2023 or higher.
This issue was patched in ALAS2023-2026-1543.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel6.12-libbpf-debuginfo package and not the kernel6.12-libbpf-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: move wait_on_sem() out of spinlock

With iommu.strict=1, the existing completion wait path can cause soft lockups under stressed environment, as wait_on_sem() busy-waits under the spinlock with interrupts disabled.

Move the completion wait in iommu_completion_wait() out of the spinlock. wait_on_sem() only polls the hardware-updated cmd_sem and does not require iommu->lock, so holding the lock during the busy wait unnecessarily increases contention and extends the time with interrupts disabled.

CVSS Base Scores

version 3.1