# CVE-2026-99116: net: psp: do not inherit the Rx association on clone


- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Also known as:** BELL-CVE-2026-99116, DEBIAN-CVE-2026-99116, GHSA-7x5j-pq24-445m, UBUNTU-CVE-2026-99116

## What is CVE-2026-99116?

CVE-2026-99116 is a vulnerability in Linux, published on 28 Oct 2026. 

### Official description

In the Linux kernel, the following vulnerability has been resolved:

net: psp: do not inherit the Rx association on clone

sk->psp_assoc sits past sk_dontcopy_end, so sock_copy() copies it into
every socket accepted from a listener without taking a reference, while
inet_sock_destruct() puts for every inet socket. psp_twsk_init() does
refcount_inc() for the timewait socket, so a child closing through
TIME_WAIT cancels its own put and leaves the association with one
reference and N timewait sockets holding the same pointer. Closing the
listener frees it, and the timewait timers then put freed memory.

Rejecting the association on a listening socket is not sufficient: a socket
can acquire one while established and then be turned back into a listener,
because tcp_disconnect() leaves sk->psp_assoc in place.

  BUG: KASAN: slab-use-after-free in psp_twsk_assoc_free+0x6f/0xf0
  Write of size 4 at addr ffff888110f9255c by task swapper/7/0
   psp_twsk_assoc_free+0x6f/0xf0
   inet_twsk_put+0xda/0x1b0
   call_timer_fn+0x53/0x2e0
   __run_timers+0x764/0xa80
  Freed by task 99:
   kfree+0x1a7/0x500
   process_one_work+0x7ec/0x1100

An association carries a per-connection SPI and key, so a child must not
inherit the parent's. Clear it on clone.

## Which versions are affected by CVE-2026-99116?


## How do I fix CVE-2026-99116?

Upgrade to a fixed version.

## Is CVE-2026-99116 being exploited?

There is no known exploitation of CVE-2026-99116 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-99116 and fix it if it is affected.

What it is: CVE-2026-99116 is a vulnerability in Linux, published on 28 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-99116 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-99116/ (Markdown: https://insights.sbomify.com/CVE-2026-99116/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-99116
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-99116
- OSV: https://osv.dev/vulnerability/CVE-2026-99116

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-99116/
Summaries are generated and may contain mistakes; the official description above is the record.