CVE Published: 21/08/2024 |
CVE Updated: 04/11/2024 |
CVE Year: 2023 Source: Linux |
Vendor: Linux |
Product: Linux Status : PUBLISHED
CVE-2023-52895 Description
In the Linux kernel, the following vulnerability has been resolved:
io_uring/poll: don\'t reissue in case of poll race on multishot request
A previous commit fixed a poll race that can occur, but it\'s only
applicable for multishot requests. For a multishot request, we can safely
ignore a spurious wakeup, as we never leave the waitqueue to begin with.
A blunt reissue of a multishot armed request can cause us to leak a
buffer, if they are ring provided. While this seems like a bug in itself,
it\'s not really defined behavior to reissue a multishot request directly.
It\'s less efficient to do so as well, and not required to rearm anything
like it is for singleshot poll requests.