---
id: CVE-2026-72243
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  selinux: check connect-related permissions on TCP Fast Open

  Similar to Landlock, SELinux was not updated when TCP Fast Open
  support was introduced to ensure connect-re…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  selinux: check connect-related permissions on TCP Fast Open

  Similar to Landlock, SELinux was not updated when TCP Fast Open
  support was introduced to ensure connect-re…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-551
vendor: Red Hat
product: Red Hat Enterprise Linux BaseOS (v. 10)
affected:
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - enterprise_linux_appstream_eus_v_10_0
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_eus_v_10_0
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_eus_v_10_0
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_real_time_for_nfv_eus_v_10_0
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_eus_v_10_0
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
patched:
  - enterprise_linux_appstream_eus_v_10_0
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_eus_v_10_0
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_eus_v_10_0
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_real_time_for_nfv_eus_v_10_0
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_eus_v_10_0
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:17:16.370'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72243'
references:
  - url: 'https://git.kernel.org/stable/c/11406d0d7e11b4e525bb2ace2c70107031d058da'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/44c74d27d1b9aaa99fa8a83640c1223575262b80'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/646ebbc5f2ff9147d084e1213143f091026a611c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d028bc080a0dcd6a7f8e1ae1bd32dda696505ba3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e507633bf76bccf1a6af27771fb0d6e2862b7eac'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fc633a598206d4f23af782db7c0b5f3a82751d2c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72243.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-72243'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516684'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-72243'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72243'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081551-CVE-2026-72243-04e7@gregkh/T
  - url: 'https://access.redhat.com/errata/RHSA-2026:88687'
  - url: 'https://access.redhat.com/errata/RHSA-2026:71233'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68570'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00166
epssPercentile: 0.05751
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:44:53.438037Z'
scores:
  nvd: 8.4
  vendor: 7.3
  cna: 8.4
ingestedAt: '2026-10-16T19:46:24.420Z'
---

## Overview

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

selinux: check connect-related permissions on TCP Fast Open

Similar to Landlock, SELinux was not updated when TCP Fast Open
support was introduced to ensure connect-related permissions are
checked when using TCP Fast Open. Update its socket_sendmsg() hook to
call selinux_socket_connect() when MSG_FASTOPEN is passed.

## Remediation

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

## Vendor advisories

- **RHSA-2026:88687** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88687)
- **RHSA-2026:71233** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71233)
- **RHSA-2026:68570** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68570)
- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72243.json)