---
id: CVE-2026-80675
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  libbpf: Reject non-exclusive metadata maps in the signed loader

  The loader verifies map->sha against the metadata hash in its
  instructions
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  libbpf: Reject non-exclusive metadata maps in the signed loader

  The loader verifies map->sha against the metadata hash in its
  instructions. map->sha is calculated when…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80675'
references:
  - url: 'https://git.kernel.org/stable/c/0dad5adeb34b6f78a883e8faa6a1c947a240e7c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0fb6c9ed6493b4af01be8bb0a384574eba7df636'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.0017
epssPercentile: 0.05563
ingestedAt: '2026-08-30T04:47:10.248Z'
---

## Overview

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

libbpf: Reject non-exclusive metadata maps in the signed loader

The loader verifies map->sha against the metadata hash in its
instructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is
called on the frozen map.

While the map is frozen, the /signed loader/ must also ensure the map
is exclusive, as, without exclusivity (which a hostile host could just
omit when loading the loader), another BPF program with map access can
mutate the contents afterwards, so the check passes on stale data.

With the extra check as part of the signed loader, it now refuses to
move on with map->sha validation if the host set it up wrongly.

## Remediation

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