CVE-2025-21836
io_uring/kbuf: reallocate buf lists on upgrade
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: reallocate buf lists on upgrade IORING_REGISTER_PBUF_RING can reuse an old struct io_buffer_list if it was created for legacy selected buffer and has been emptied. It violates the requirement that most of the field should stay stable after publish. Always reallocate it instead.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 7, 2025 |
| Last Updated | Mar 7, 2026 |
Stay Ahead of the Next One
Get instant alerts for linux linux
Be the first to know when new unknown vulnerabilities affecting linux linux are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
Linux / Linux
2fcabce2d7d34f69a888146dab15b36a917f09d4 < 146a185f6c05ee263db715f860620606303c4633 2fcabce2d7d34f69a888146dab15b36a917f09d4 < 7d0dc28dae836caf7645fef62a10befc624dd17b 2fcabce2d7d34f69a888146dab15b36a917f09d4 < 2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4 2fcabce2d7d34f69a888146dab15b36a917f09d4 < 8802766324e1f5d414a81ac43365c20142e85603
Linux / Linux
5.19
References
git.kernel.org: https://git.kernel.org/stable/c/146a185f6c05ee263db715f860620606303c4633 git.kernel.org: https://git.kernel.org/stable/c/7d0dc28dae836caf7645fef62a10befc624dd17b git.kernel.org: https://git.kernel.org/stable/c/2a5febbef40ce968e295a7aeaa5d5cbd9e3e5ad4 git.kernel.org: https://git.kernel.org/stable/c/8802766324e1f5d414a81ac43365c20142e85603 u1f383.github.io: https://u1f383.github.io/slides/talks/2025_Hexacon-Deja_Vu_in_Linux_io_uring_Breaking_Memory_Sharing_Again_After_Generations_of_Fixes.pdf