CVE-2023-54268
Published Dec 30, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: debugobjects: Don't wake up kswapd from fill_pool() syzbot is reporting a lockdep warning in fill_pool() because the allocation from debugobjects is using GFP_ATOMIC, which is (__GFP_HIGH | __GFP_KSWAPD_RECLAIM) and therefore tries to wake up kswapd, which acquires kswapd_wait::lock. Since fill_pool() might be called with arbitrary locks held, fill_pool() should not assume that acquiring kswapd_wait::lock is safe. Use __GFP_HIGH instead and remove __GFP_NORETRY as it is pointless for !__GFP_DIRECT_RECLAIM allocation.
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References
Other References
https://git.kernel.org/stable/c/4c088d30a72d9b8f9c6ae9362222942e4075cb00
https://git.kernel.org/stable/c/aee97eec77029270866c704f66cdf2881cbd2fe1
https://git.kernel.org/stable/c/be646802b3dc408c4dc72a3ac32c3f4a0282414d
https://git.kernel.org/stable/c/d7fff52c99d52f180d8bef95d8ed8fec6343889c
https://git.kernel.org/stable/c/eb799279fb1f9c63c520fe8c1c41cb9154252db6
https://git.kernel.org/stable/c/fd673079749bac97bb30f1461df079e6c8e86511
Frequently Asked Questions
What is CVE-2023-54268? +
In the Linux kernel, the following vulnerability has been resolved:
debugobjects: Don't wake up kswapd from fill_pool()
syzbot is reporting a lockdep warning in fill_pool() because the allocation
from debugobjects is using GFP_ATOMIC, which is (__GFP_HIGH | __GFP_KSWAPD_RECLAIM)
and therefore tries to wake up kswapd, which acquires kswapd_wait::lock.
Since fill_pool() might be called with arbitrary locks held, fill_pool()
should not assume that acquiring kswapd_wait::lock is safe.
Use __GFP_HIGH instead and remove __GFP_NORETRY as it is pointless for
!__GFP_DIRECT_RECLAIM allocation.
How do I check if I'm vulnerable to CVE-2023-54268? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.