---
id: CVE-2026-68337
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject redirect helpers without a bpf_net_context

  The bpf_redirect*() helpers and skb_do_redirect() obtain the per-task
  bpf_redirect_info via bpf_net_ctx_get_ri()…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject redirect helpers without a bpf_net_context

  The bpf_redirect*() helpers and skb_do_redirect() obtain the per-task
  bpf_redirect_info via bpf_net_ctx_get_ri()…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3625750f05ecce21a0fce429c1ff85acfffb461b <
    0f2118b757509332bb0e65f90e5233766f14bb88
  - >-
    Linux >= 3625750f05ecce21a0fce429c1ff85acfffb461b <
    aafb093adffad91d4d071e8a7e0dcd9b1d91c94a
  - >-
    Linux >= 3625750f05ecce21a0fce429c1ff85acfffb461b <
    cabfacbd5af09d3ae898ca224c4a1459e9bba15d
  - >-
    Linux >= 3625750f05ecce21a0fce429c1ff85acfffb461b <
    3f4920d165b29052255527d8ae7619e7ec132ece
  - Linux 5.9
published: '2026-08-10'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T14:17:16.860'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68337'
references:
  - url: 'https://git.kernel.org/stable/c/0f2118b757509332bb0e65f90e5233766f14bb88'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3f4920d165b29052255527d8ae7619e7ec132ece'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aafb093adffad91d4d071e8a7e0dcd9b1d91c94a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/cabfacbd5af09d3ae898ca224c4a1459e9bba15d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00155
epssPercentile: 0.05062
ingestedAt: '2026-09-21T13:37:22.846Z'
---

## Overview

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

bpf: Reject redirect helpers without a bpf_net_context

The bpf_redirect*() helpers and skb_do_redirect() obtain the per-task
bpf_redirect_info via bpf_net_ctx_get_ri(), which dereferences the
current->bpf_net_context unconditionally. That context is established
on the paths that run tc BPF such as sch_handle_{ingress,egress}(),
*except* for the case where {cls,act}_bpf was attached to a proper
qdisc. A program running from there reaches the NULL deref in two ways:

* It calls bpf_redirect() directly, which dereferences the context at
  the top of the helper:

     tc qdisc add dev eth0 root handle 1: red limit 1MB min 10KB max 20KB \
        avpkt 1000 burst 100 qevent early_drop block 10
     tc filter add block 10 pref 1 bpf obj redirect.o

* It simply returns TC_ACT_REDIRECT without helper call: tcf_qevent_handle()
  then dispatches to skb_do_redirect(), which dereferences the context

Rather than extending bpf_net_context management into the qdisc path,
make the redirect helpers refuse to operate when no context exists, and
have tcf_qevent_handle() drop a TC_ACT_REDIRECT verdict instead of
calling skb_do_redirect(). Previous behaviour was a crash, so nothing
regresses by not supporting it.

## Remediation

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