---
id: CVE-2022-49622
title: 'netfilter: nf_tables: avoid skb access on nf_stolen'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_tables: avoid skb access on nf_stolen

  When verdict is NF_STOLEN, the skb might have been freed.

  When tracing is enabled, this can result in a use-after-…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 <
    348218a4601e93de4d1e9fab29837cf656e4bf99
  - >-
    Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 <
    453a67af8bd77463b33cb0336dd7f2341e332d29
  - >-
    Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 <
    0016d5d46d7440729a3132f61a8da3bf7f84e2ba
  - >-
    Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 <
    e34b9ed96ce3b06c79bf884009b16961ca478f87
  - Linux 4.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2025-02-27T18:15:30.357017Z'
published: '2025-02-26'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:17:07.220Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2022-49622'
references:
  - url: 'https://git.kernel.org/stable/c/348218a4601e93de4d1e9fab29837cf656e4bf99'
  - url: 'https://git.kernel.org/stable/c/453a67af8bd77463b33cb0336dd7f2341e332d29'
  - url: 'https://git.kernel.org/stable/c/0016d5d46d7440729a3132f61a8da3bf7f84e2ba'
  - url: 'https://git.kernel.org/stable/c/e34b9ed96ce3b06c79bf884009b16961ca478f87'
tags:
  - cve.org
epss: 0.00273
epssPercentile: 0.19837
ingestedAt: '2026-11-03T11:43:15.778Z'
---

## Overview

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

netfilter: nf_tables: avoid skb access on nf_stolen

When verdict is NF_STOLEN, the skb might have been freed.

When tracing is enabled, this can result in a use-after-free:
1. access to skb->nf_trace
2. access to skb->mark
3. computation of trace id
4. dump of packet payload

To avoid 1, keep a cached copy of skb->nf_trace in the
trace state struct.
Refresh this copy whenever verdict is != STOLEN.

Avoid 2 by skipping skb->mark access if verdict is STOLEN.

3 is avoided by precomputing the trace id.

Only dump the packet when verdict is not "STOLEN".

## Affected

- `Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 < 348218a4601e93de4d1e9fab29837cf656e4bf99`
- `Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 < 453a67af8bd77463b33cb0336dd7f2341e332d29`
- `Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 < 0016d5d46d7440729a3132f61a8da3bf7f84e2ba`
- `Linux >= 5efa0fc6d7f7930b18801f07cefae8eeacd6ac02 < e34b9ed96ce3b06c79bf884009b16961ca478f87`
- `Linux 4.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.