---
id: CVE-2026-90313
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed

  A potential invalid storage access issue can occur after replacing a
  cgroup bpf prog.

  This oc…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed

  A potential invalid storage access issue can occur after replacing a
  cgroup bpf prog.

  This oc…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7d9c3427894fe70d1347b4820476bf37736d2ff0 <
    e26db0d636e4c24a6b16683ea95cf5077c64d74b
  - >-
    Linux >= 7d9c3427894fe70d1347b4820476bf37736d2ff0 <
    aaca16e042527f7efe48b50799bc662f1a191ce1
  - >-
    Linux >= 7d9c3427894fe70d1347b4820476bf37736d2ff0 <
    86ead176301109b78e1d14c0e9d0d9ff9723c769
  - >-
    Linux >= 7d9c3427894fe70d1347b4820476bf37736d2ff0 <
    2c2218560b6e28a63ff7834ba26d09ff8efdee39
  - >-
    Linux >= 7d9c3427894fe70d1347b4820476bf37736d2ff0 <
    6655c409707ec8ce9ce0850ffe4fe02331fd4d9c
  - Linux 5.9
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:29.087'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90313'
references:
  - url: 'https://git.kernel.org/stable/c/2c2218560b6e28a63ff7834ba26d09ff8efdee39'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6655c409707ec8ce9ce0850ffe4fe02331fd4d9c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/86ead176301109b78e1d14c0e9d0d9ff9723c769'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/aaca16e042527f7efe48b50799bc662f1a191ce1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e26db0d636e4c24a6b16683ea95cf5077c64d74b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.826Z'
epss: 0.002
epssPercentile: 0.08722
---

## Overview

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

bpf, cgroup: Fix invalid storage access after __cgroup_bpf_attach failed

A potential invalid storage access issue can occur after replacing a
cgroup bpf prog.

This occurs in the following scenario:
1. prog1 with storage is attached to a cgroup in multi-attach mode.
2. prog1 is replaced with prog2 using BPF_F_REPLACE in multi-attach
   mode, but fails midway (e.g. in bpf_trampoline_link_cgroup_shim or
   update_effective_progs).
3. A new prog3 is attached to the cgroup in multi-attach mode.

The reason is that __cgroup_bpf_attach overwrites pl->storage with the
new storage prior to attachment completion. When attachment fails
midway, the cleanup path calls bpf_cgroup_storages_free(new_storage) to
free the newly allocated storage, but fails to restore pl->storage back
to old_storage.

Consequently, the still-active prog1 holds invalid or dangling storage
pointers, leading to an invalid memory access when prog1 executes and
calls bpf_get_local_storage. Additionally, original pl->flags and
cgrp->bpf.flags[atype] are left unrestored.

Fix this by saving old_pl_flags, old_storage, and old_flags prior to the
update, and properly restoring all of them in the cleanup path on error.

## Remediation

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