---
id: CVE-2026-97503
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

  /proc/irq/<n>/ directory names are built in `char name[10]` buffers
  with `sprintf(name, "%u"…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

  /proc/irq/<n>/ directory names are built in `char name[10]` buffers
  with `sprintf(name, "%u"…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d4b22fbae70037299e96539c330e4a1054b28a91
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    c2c7983c93f5d86962318be7e7298f1bc3feb1a6
  - Linux < 6.18.53
  - Linux (all versions)
published: '2026-09-24'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T06:16:36.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97503'
references:
  - url: 'https://git.kernel.org/stable/c/c2c7983c93f5d86962318be7e7298f1bc3feb1a6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d4b22fbae70037299e96539c330e4a1054b28a91'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97503.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97503'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540488'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97503'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97503'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97503.mbox
  - url: 'https://git.kernel.org/stable/c/a8adf64fe7fd5d7c476769a043ee56eda7b775ce'
  - url: 'https://git.kernel.org/stable/c/488bcd7fd3e9a2ad647b71b505a269fdb28753c4'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00157
epssPercentile: 0.04782
ingestedAt: '2026-09-24T16:47:15.863Z'
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-787
---

## Overview

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

genirq/proc: Size interrupt directory names for 10-digit interrupt numbers

/proc/irq/<n>/ directory names are built in `char name[10]` buffers
with `sprintf(name, "%u", irq)`.

Ten-digit IRQ numbers already need 11 bytes including the trailing NUL, and
current sparse-IRQ configurations allow interrupt numbers in that range.

Size the temporary name buffer for the current decimal form and switch
to bounded formatting when creating or removing the proc entry.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · 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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97503.json)