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THREAT OPS › Threat News › [NVD] CVE-2025-21836 (HIGH 7.8) — 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 tha

[NVD] CVE-2025-21836 (HIGH 7.8) — 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 tha

lownvdPublished 2025-03-07

CVE-2025-21836 CVSS: 7.8 HIGH Published: 2025-03-07T09:15:16.600

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.

Indicators of compromise

CVE-2025-21836cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-21836