medium5.5
CVE-2021-47567
In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/3…
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 5.9.5 before 5.10.83 from 5.11 before 5.15.6 Version 5.16 |
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e
- https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b
- https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7
- https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e
- https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b
- https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7