CVE-2023-52895
io_uring/poll: don't reissue in case of poll race on multishot request
Reported by linux · Published August 21, 2024
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | 8caa03f10bf92cb8657408a6ece6a8a73f96ce13, 6.1.8, 36fc7317cdb16cfeae0f879916995037bb615ac4 |
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | c06015ebc4367be38904b88582e13cc079672075, 6e5aedb9324aab1c14a23fae3d8eeb64a679c20e |
| Linux | Linux | 6.1.7 |
| Linux | Linux | *, 6e5aedb9324aab1c14a23fae3d8eeb64a679c20e, 6.1.7 |
| linux | linux_kernel | 6.1.7 |
Timeline
- Aug 21, 2024 CVE Published
- Aug 21, 2024 PoC Published
- Aug 22, 2024 EPSS Score (30 in total, the first dated here)
- Oct 5, 2024 Coalition ESS Score (8 in total, the first dated here)
- Jan 25, 2026 Security Advisory (161 in total, the first dated here)
- Sep 17, 2026 CVE Updated
- Sep 18, 2026 Distribution Patch (94 in total, the first dated here)
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