CVE-2025-21836
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedMar 7, 2025
First seenMar 7, 2025
How to fix
Update
- linux linux_kernel6.6.79, 6.12.16, 6.13.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.19 ≤ v < 6.6.79, 6.7 ≤ v < 6.12.16, 6.13 ≤ v < 6.13.4, 6.14 | 6.6.79, 6.12.16, 6.13.4 |
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