RDMA/rtrs-srv: Fix integer underflow in process_read and process_write (CVE-2026-97413) | HOL Guard CVE

Critical · CVSS 9.8CVE-2026-97413

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

Answer in brief

CVE-2026-97413 records a Critical severity (CVSS 9.8) vulnerability in RDMA/rtrs-srv: Fix integer underflow in process_read and process_write. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24ad03bfeda05fca04c56677e57fd3d6bc3e9978 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c76e9123ab91a903396d26e6ab1b5caae5c6b149 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5 \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	24ad03bfeda05fca04c56677e57fd3d6bc3e9978, c76e9123ab91a903396d26e6ab1b5caae5c6b149, 54bf38b27afc08a0eb6b732f9c14eb8a4bcb66b5, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 24ad03bfeda05fca04c56677e57fd3d6bc3e9978 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.