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Vulnerabilities CVE-2025-21836

CVE-2025-21836

High
Open
TLP:CLEAR

io_uring/kbuf: reallocate buf lists on upgrade

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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.

Details

CVSS Score
7.8
EPSS Score
0.25%

16.1th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Confidence
90%
Published
Mar 7, 2025
Last Modified
Aug 5, 2026
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