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CVE-2026-97413: RDMA/rtrs-srv: Fix integer underflow in process_read and process_write

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-03

Description

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 products

• Linux kernel: 5.8 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24ad03bfeda05fca04c56677e57fd3d6bc3e9978
• https://git.kernel.org/stable/c/2c52b2afded988233cd4ccc185cf5147bbc77a76
• https://git.kernel.org/stable/c/54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5
• https://git.kernel.org/stable/c/6b1e26e70d7ca9f0906af2283558a530eeb1f066
• https://git.kernel.org/stable/c/b042b4947752df0b3d16e683ac09fb4f7f0e33e0
• https://git.kernel.org/stable/c/c76e9123ab91a903396d26e6ab1b5caae5c6b149

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