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CVE-2026-53238

Updated on 25 Jun 2026

Severity

5.5 Medium severity

Details

CVSS score
5.5
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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

netlabel: validate unlabeled address and mask attribute lengths

netlbl_unlabel_addrinfo_get() used the address attribute length to determine whether the attribute data could be read as an IPv4 or IPv6 address, but did not independently validate the corresponding mask attribute length. A crafted Generic Netlink request could therefore provide a valid IPv4/IPv6 address attribute with a shorter mask attribute, which would later be read as a full struct in_addr or struct in6_addr.

NLA_BINARY policy lengths are maximum lengths by default, so use NLA_POLICY_EXACT_LEN() for the unlabeled IPv4/IPv6 address and mask attributes. This rejects short attributes during policy validation and also exposes the exact length requirements through policy introspection.

Details

Affected product:
AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Debian 11 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
Affected packages:
kernel @ 5.14.0 (+19 more)

Fixes

KernelCare state

Live-patch status from KernelCare for each operating system.

Operating system Status Covered kernels
AlmaLinux 9.2 ESU Released
33 kernels
  • 5.14.0-284.1101.el9_2.tuxcare.7.els20
  • 5.14.0-284.1101.el9_2.tuxcare.7.els21
  • 5.14.0-284.1101.el9_2.tuxcare.7.els23
  • 5.14.0-284.1101.el9_2.tuxcare.7.els22
  • 5.14.0-284.1101.el9_2.tuxcare.7.els14
  • 5.14.0-284.1101.el9_2.tuxcare.7.els18
  • 5.14.0-284.1101.el9_2.tuxcare.7.els16
  • 5.14.0-284.1101.el9_2.tuxcare.7.els15
  • 5.14.0-284.1101.el9_2.tuxcare.7.els17
  • 5.14.0-284.1101.el9_2.tuxcare.7.els19
  • 5.14.0-284.1101.el9_2.tuxcare.7.els24
  • 5.14.0-284.1101.el9_2.tuxcare.7.els25
  • 5.14.0-284.1101.el9_2.tuxcare.7.els26
  • 5.14.0-284.1101.el9_2.tuxcare.7.els27
  • 5.14.0-284.1101.el9_2.tuxcare.7.els28
  • 5.14.0-284.1101.el9_2.tuxcare.7.els29
  • 5.14.0-284.1101.el9_2.tuxcare.7.els30
  • 5.14.0-284.1101.el9_2.tuxcare.7.els31
  • 5.14.0-284.1101.el9_2.tuxcare.7.els32
  • 5.14.0-284.1101.el9_2.tuxcare.7.els35
  • 5.14.0-284.1101.el9_2.tuxcare.7.els34
  • 5.14.0-284.1101.el9_2.tuxcare.11.els1
  • 5.14.0-284.1101.el9_2.tuxcare.11.els2
  • 5.14.0-284.1101.el9_2.tuxcare.11.els3
  • 5.14.0-284.1101.el9_2.tuxcare.11.els4
  • 5.14.0-284.1101.el9_2.tuxcare.11.els5
  • 5.14.0-284.1101.el9_2.tuxcare.11.els6
  • 5.14.0-284.1101.el9_2.tuxcare.11.els7
  • 5.14.0-284.1101.el9_2.tuxcare.11.els8
  • 5.14.0-284.1101.el9_2.tuxcare.11.els9
  • 5.14.0-284.1101.el9_2.tuxcare.11.els10
  • 5.14.0-284.1101.el9_2.tuxcare.11.els11
  • 5.14.0-284.1101.el9_2.tuxcare.11.els12
AlmaLinux 9.6 ESU Planned —
Amazon Linux 2023 Planned —
Debian 11 Planned —
Debian 11 cloud Planned —
Debian 12 Planned —