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Medium severity5.5NVD Advisory· Published May 24, 2024· Updated Jun 17, 2026

CVE-2021-47567

CVE-2021-47567

Description

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

powerpc/32: Fix hardlockup on vmap stack overflow

Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time.

Fix it by using a physical address instead.

Affected products

5
  • Linux/Kernelllm-fuzzy5 versions
    (expand)+ 4 more
    • (no CPE)
    • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.9.5,<5.10.83
    • cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
    • cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*
    • (no CPE)range: 5.10

Patches

Vulnerability mechanics

References

3

News mentions

0

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