CVE-2026-90308

Published: September 19, 2026Last modified: September 28, 2026

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold QP references for AE and CM processing AE QP fatal events and iWARP CM paths load QPs from dev->qp_xa and then use or reference them outside the xarray lock. erdma_destroy_qp() can drop the destroy-path reference and free QP resources while such a lookup is in flight. Add erdma_qp_get_by_qpn() to acquire a kref under the xarray lock with kref_get_unless_zero(). Remove the QP from the xarray before dropping the destroy-path reference so no new lookup can acquire it while destruction waits for existing users.

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/6e32f84b63c054e09392153125d7202abab2d14b
• https://git.kernel.org/stable/c/a52eeff32024f190b3bdc99088c7becccd4fa60b
• https://git.kernel.org/stable/c/c92686867638cda954fdb2bdbac8a75e3aa6eaae
• https://git.kernel.org/stable/c/ec987c0654651036dad6a42f7fa2a6d7c16a3687