---
id: CVE-2026-98611
title: 'bpf: Check params size before reading reserved fields'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Check params size before reading reserved fields

  bpf_crypto_ctx_create() is a kfunc whose second argument is declared
  with the __sz annotation, so the verifier on…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 <
    e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a
  - >-
    Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 <
    cd12d3e08620257fbcaa262785d7f4b9473afc7a
  - >-
    Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 <
    86a0e945fb645ea90233fde239cd2de79f01974c
  - >-
    Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 <
    a11212910cf09b2fe8db9afa41ef60c4f81879c5
  - Linux 6.10
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:19:26.922Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98611'
references:
  - url: 'https://git.kernel.org/stable/c/e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a'
  - url: 'https://git.kernel.org/stable/c/cd12d3e08620257fbcaa262785d7f4b9473afc7a'
  - url: 'https://git.kernel.org/stable/c/86a0e945fb645ea90233fde239cd2de79f01974c'
  - url: 'https://git.kernel.org/stable/c/a11212910cf09b2fe8db9afa41ef60c4f81879c5'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.241Z'
---

## Overview

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

bpf: Check params size before reading reserved fields

bpf_crypto_ctx_create() is a kfunc whose second argument is declared
with the __sz annotation, so the verifier only guarantees that
params__sz bytes of params are valid.  The function nevertheless reads
params->reserved[0] and params->reserved[1] (offsets 14 and 15) before
comparing params__sz against the size of struct bpf_crypto_params, so a
BPF program can pass a shorter buffer and have the kernel read past the
region that was validated for it.

Move the size check in front of the reserved field reads.

## Affected

- `Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 < e03253f5d65ebcd2a6d479f140c3bd9c7e4fb84a`
- `Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 < cd12d3e08620257fbcaa262785d7f4b9473afc7a`
- `Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 < 86a0e945fb645ea90233fde239cd2de79f01974c`
- `Linux >= 3e1c6f35409f9e447bf37f64840f5b65576bfb78 < a11212910cf09b2fe8db9afa41ef60c4f81879c5`
- `Linux 6.10`

## Remediation

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