CVE-2023-52895
N/A
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c06015ebc4367be38904b88582e13cc079672075 < 36fc7317cdb16cfeae0f879916995037bb615ac4 | affected |
| Linux | Linux | 6e5aedb9324aab1c14a23fae3d8eeb64a679c20e < 8caa03f10bf92cb8657408a6ece6a8a73f96ce13 | affected |
| Linux | Linux | 6.1.7 < 6.1.8 | affected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://git.kernel.org/stable/c/36fc7317cdb16cfeae0f879916995037bb615ac4
- https://git.kernel.org/stable/c/8caa03f10bf92cb8657408a6ece6a8a73f96ce13
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