---
id: CVE-2026-53089
title: 'bpf: Fix use-after-free in offloaded map/prog info fill'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Fix use-after-free in offloaded map/prog info fill

  When querying info for an offloaded BPF map or program,
  bpf_map_offload_info_fill_ns() and bpf_prog_offload_inf…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    fea55b034328feaafef75aee252f305e6f85a991
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    5662dac41a3442aa378d7c405164903eb109fc05
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    1a2dc103e16448d022a77ad5fc3234641436c4b7
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    85dc711f742b192eb97c0e00b521312f5a7a415e
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    a51e7fbe94a87e236631a83973d4f558310b2cd2
  - >-
    Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b <
    a0c584fc18056709c8e047a82a6045d6c209f4ce
  - Linux 4.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T16:18:12.065771Z'
published: '2026-06-24'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T16:23:59.016Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53089'
references:
  - url: 'https://git.kernel.org/stable/c/43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d'
  - url: 'https://git.kernel.org/stable/c/642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e'
  - url: 'https://git.kernel.org/stable/c/fea55b034328feaafef75aee252f305e6f85a991'
  - url: 'https://git.kernel.org/stable/c/5662dac41a3442aa378d7c405164903eb109fc05'
  - url: 'https://git.kernel.org/stable/c/1a2dc103e16448d022a77ad5fc3234641436c4b7'
  - url: 'https://git.kernel.org/stable/c/85dc711f742b192eb97c0e00b521312f5a7a415e'
  - url: 'https://git.kernel.org/stable/c/a51e7fbe94a87e236631a83973d4f558310b2cd2'
  - url: 'https://git.kernel.org/stable/c/a0c584fc18056709c8e047a82a6045d6c209f4ce'
tags:
  - cve.org
epss: 0.00117
epssPercentile: 0.01669
ingestedAt: '2026-11-06T16:57:43.296Z'
---

## Overview

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

bpf: Fix use-after-free in offloaded map/prog info fill

When querying info for an offloaded BPF map or program,
bpf_map_offload_info_fill_ns() and bpf_prog_offload_info_fill_ns()
obtain the network namespace with get_net(dev_net(offmap->netdev)).
However, the associated netdev's netns may be racing with teardown
during netns destruction. If the netns refcount has already reached 0,
get_net() performs a refcount_t increment on 0, triggering:

  refcount_t: addition on 0; use-after-free.

Although rtnl_lock and bpf_devs_lock ensure the netdev pointer remains
valid, they cannot prevent the netns refcount from reaching zero.

Fix this by using maybe_get_net() instead of get_net(). maybe_get_net()
uses refcount_inc_not_zero() and returns NULL if the refcount is already
zero, which causes ns_get_path_cb() to fail and the caller to return
-ENOENT -- the correct behavior when the netns is being destroyed.

## Affected

- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 43d6848a2a6c92ccfd614d9f0bb6fd85b95dfa9d`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 642943ae5bdacabc8109dc4a5e0ebb4a6b99ef3e`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < fea55b034328feaafef75aee252f305e6f85a991`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 5662dac41a3442aa378d7c405164903eb109fc05`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 1a2dc103e16448d022a77ad5fc3234641436c4b7`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < 85dc711f742b192eb97c0e00b521312f5a7a415e`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a51e7fbe94a87e236631a83973d4f558310b2cd2`
- `Linux >= 675fc275a3a2d905535207237402c6d8dcb5fa4b < a0c584fc18056709c8e047a82a6045d6c209f4ce`
- `Linux 4.16`

## Remediation

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