Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Fix integer underflow in process_read and process_write usr_len is read from a network-supplied message field (le16_to_cpu) and used to compute data_len = off - usr_len without validating that usr_len <= off. A malicious RDMA client can send usr_len > off causing an integer underflow, resulting in data_len wrapping to a huge size_t value which is then passed to the rdma_ev callback as a memory length, leading to out-of-bounds memory access. Fix by reading and validating usr_len <= off before rtrs_srv_get_ops_ids() in both process_read() and process_write(), ensuring the early return path acquires no reference and has no resource leak.

Affected versions

Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 24ad03bfeda05fca04c56677e57fd3d6bc3e9978 (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before c76e9123ab91a903396d26e6ab1b5caae5c6b149 (git); 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 through before 54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5 (git); before 6.12.111 (semver); before 6.18.53 (semver) Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.