---
id: CVE-2026-90157
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject negative optlen in cgroup getsockopt hook

  A cgroup getsockopt BPF program can shrink ctx->optlen after the
  kernel getsockopt handler has run
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf: Reject negative optlen in cgroup getsockopt hook

  A cgroup getsockopt BPF program can shrink ctx->optlen after the
  kernel getsockopt handler has run. The kernel-bu…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 08f61a34913558e06576e7b6318bf583f273c1be <
    5b09d984b38b018b123c3a9e02a96bbc6468dbe5
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    554ba7195c4108726450e24480c8449990c2268c
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    d02a12b4085ffe41ea750b1007f7a9c7aee2875a
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    f68671b1a98d426c57864bd457c125fee14ac1a5
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    2bdbe00454200fcb0110f31eeca8d906a3515e74
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    31a89af4f513d750fec196e2bb6195a7d4473e9f
  - >-
    Linux >= 9cacf81f8161111db25f98e78a7a0e32ae142b3f <
    1b5aacd5b2419b0790e955e466d389a61c79b4b1
  - Linux >= 5.10.188 < 5.10.270
  - Linux 5.12
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:08.817'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90157'
references:
  - url: 'https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.873Z'
epss: 0.0021
epssPercentile: 0.11542
---

## Overview

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

bpf: Reject negative optlen in cgroup getsockopt hook

A cgroup getsockopt BPF program can shrink ctx->optlen after the
kernel getsockopt handler has run. The kernel-buffer variant, used by
TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original
length.

If BPF writes a negative optlen, that value is accepted and propagated
back to the TCP getsockopt code. It can then be passed to
copy_to_sockptr() as a size_t and trigger the hardened usercopy
bytes > INT_MAX warning.

Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),
matching the lower-bound validation already present in the sockptr-based
getsockopt hook.

## Remediation

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