---
id: CVE-2026-81008
title: 'interconnect: Fix use after free in icc_get() and of_icc_get_by_index()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  interconnect: Fix use after free in icc_get() and of_icc_get_by_index()

  In of_icc_get_by_index() and icc_get(), if the dynamic allocation for
  path->name fails via kasp…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-825
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    03c3af594dea9196cf6ca70d914b42aa8c873c35
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    d4d73decdb9a44a248b1cbd04ed6f334df544d9c
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    9a671125d4228357e5b929733c4593d27a273749
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    fedea72e8f312fe7d0c6cb19353e61d2d5643b11
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    a4e9aa7907ade87d1d96853d14e05dcf682f8363
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    db8147c5d5ad2cfa21c2be566f95981b41b05de6
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    d715d19cfcfe99f361adb05cefc143a95d400b87
  - >-
    Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 <
    25c7e242aca084fdc1098248194032317dca625d
  - Linux 5.6
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:46:33.532Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-81008'
references:
  - url: 'https://git.kernel.org/stable/c/03c3af594dea9196cf6ca70d914b42aa8c873c35'
  - url: 'https://git.kernel.org/stable/c/d4d73decdb9a44a248b1cbd04ed6f334df544d9c'
  - url: 'https://git.kernel.org/stable/c/9a671125d4228357e5b929733c4593d27a273749'
  - url: 'https://git.kernel.org/stable/c/fedea72e8f312fe7d0c6cb19353e61d2d5643b11'
  - url: 'https://git.kernel.org/stable/c/a4e9aa7907ade87d1d96853d14e05dcf682f8363'
  - url: 'https://git.kernel.org/stable/c/db8147c5d5ad2cfa21c2be566f95981b41b05de6'
  - url: 'https://git.kernel.org/stable/c/d715d19cfcfe99f361adb05cefc143a95d400b87'
  - url: 'https://git.kernel.org/stable/c/25c7e242aca084fdc1098248194032317dca625d'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81008.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81008'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532455'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81008'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81008'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81008.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00164
epssPercentile: 0.05553
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

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

interconnect: Fix use after free in icc_get() and of_icc_get_by_index()

In of_icc_get_by_index() and icc_get(), if the dynamic allocation for
path->name fails via kasprintf(), the error handling path directly
calls kfree(path) to free the path object and returns an error.

However, prior to this point, path_find() calls path_init(), which
already links the path's requests into the req_list of the respective
interconnect nodes via hlist_add_head(). Directly invoking kfree(path)
leaves dangling pointers in the hlist. A subsequent call to icc_get()
or icc_set_bw() will traverse or modify these corrupted lists, triggering
a slab use afterfree.

KASAN report showing the vulnerability when reproducing via debugfs:

  BUG: KASAN: slab-use-after-free in path_find+0x6f8/0xcfc
  Write of size 8 at addr fff000000d43f748 by task sh/1
  ...
  Call trace:
   kasan_report+0xac/0xfc
   path_find+0x6f8/0xcfc
   icc_get+0x148/0x380
   icc_get_set+0xf8/0x2d0
  ...
  Freed by task 1:
   kfree+0x1a0/0x4a4
   icc_get+0x2cc/0x380
   icc_get_set+0xf8/0x2d0

Fix this by replacing kfree(path) with the proper teardown function,
icc_put(path), which safely removes the requests from the req_list using
hlist_del() and drops the provider usage references before freeing the
memory.

Additionally, in icc_get(), ensure that the icc_lock mutex is released
prior to calling icc_put(path) to avoid a deadlock, as icc_put()
internally acquires the same lock.

## Affected

- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < 03c3af594dea9196cf6ca70d914b42aa8c873c35`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < d4d73decdb9a44a248b1cbd04ed6f334df544d9c`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < 9a671125d4228357e5b929733c4593d27a273749`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < fedea72e8f312fe7d0c6cb19353e61d2d5643b11`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < a4e9aa7907ade87d1d96853d14e05dcf682f8363`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < db8147c5d5ad2cfa21c2be566f95981b41b05de6`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < d715d19cfcfe99f361adb05cefc143a95d400b87`
- `Linux >= 3791163602f7140011a8dc1691cfe6ec0cb1ef07 < 25c7e242aca084fdc1098248194032317dca625d`
- `Linux 5.6`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81008.json)