---
id: CVE-2026-80928
title: 'kernel: smack: fix cred UAF in smack_file_send_sigiotask() (CVE-2026-80928)'
summary: >-
  A flaw was found in the Linux kernel's SMACK (Simplified Mandatory Access
  Control Kernel) security module. Incorrect handling of task credentials within
  the smack_file_send_sigiotask() function can lead to a Use-After-Free (UAF)
  vulnerabil…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    a512366d84e134a9eefc2cc40eeb6e80e2ec162c
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    7c7fe043f3099d0d35002b248967f75e55345b93
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    f9c7b1f2b9d8f4176d2632743f51400855978ace
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    b5bcf3adfa27279da4401ab8f1e1a706601a92be
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    ed64aa505875a3b4defd504ee8e59e1949246a62
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    b791401bf389a1546a830d2b381ca60fe94c7870
  - >-
    Linux >= 3b11a1decef07c19443d24ae926982bc8ec9f4c0 <
    fedc88e38ce979a720cd2de042578cb5df3dc8de
  - Linux 2.6.29
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T13:53:59+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80928.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80928.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80928'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532381'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80928'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80928'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80928.mbox
  - url: 'https://git.kernel.org/stable/c/a512366d84e134a9eefc2cc40eeb6e80e2ec162c'
  - url: 'https://git.kernel.org/stable/c/7c7fe043f3099d0d35002b248967f75e55345b93'
  - url: 'https://git.kernel.org/stable/c/f9c7b1f2b9d8f4176d2632743f51400855978ace'
  - url: 'https://git.kernel.org/stable/c/b5bcf3adfa27279da4401ab8f1e1a706601a92be'
  - url: 'https://git.kernel.org/stable/c/ed64aa505875a3b4defd504ee8e59e1949246a62'
  - url: 'https://git.kernel.org/stable/c/b791401bf389a1546a830d2b381ca60fe94c7870'
  - url: 'https://git.kernel.org/stable/c/fedc88e38ce979a720cd2de042578cb5df3dc8de'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00176
epssPercentile: 0.06273
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.455Z'
---

## Overview

A flaw was found in the Linux kernel's SMACK (Simplified Mandatory Access Control Kernel) security module. Incorrect handling of task credentials within the smack_file_send_sigiotask() function can lead to a Use-After-Free (UAF) vulnerability. A local attacker could exploit this flaw to potentially escalate their privileges or disclose sensitive information by manipulating the timing of credential access.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80928.json)

**kernel: smack: fix cred UAF in smack_file_send_sigiotask()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Refer to the advisory for fix availability.