Description
In the Linux kernel, the following vulnerability has been resolved:
selinux: fix overlayfs mmap() and mprotect() access checks
The existing SELinux security model for overlayfs is to allow access if
the current task is able to access the top level file (the "user" file)
and the mounter's credentials are sufficient to access the lower
level file (the "backing" file). Unfortunately, the current code does
not properly enforce these access controls for both mmap() and mprotect()
operations on overlayfs filesystems.
This patch makes use of the newly created security_mmap_backing_file()
LSM hook to provide the missing backing file enforcement for mmap()
operations, and leverages the backing file API and new LSM blob to
provide the necessary information to properly enforce the mprotect()
access controls.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.19 | 6.6.144 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 7.0.4-1 | — |
| Debian 13 | linux | 6.12.95-1 | — |
| Debian 12 | linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 26.04 LTS | linux | 7.0.0-27.27 | USN-8488-1 |
| Ubuntu 26.04 LTS | linux-aws +1 | 7.0.0-1008.8 | USN-8489-1, USN-8488-1 |
| Ubuntu 26.04 LTS | linux-azure | 7.0.0-1010.10 | USN-8603-1 |
| Ubuntu 26.04 LTS | linux-gcp +1 | 7.0.0-1007.7 | USN-8488-1 |
| Ubuntu 26.04 LTS | linux-ibm +1 | 7.0.0-1009.9 | USN-8603-1, USN-8488-1 |
| Ubuntu 26.04 LTS | linux-nvidia | 7.0.0-1013.13 | USN-8507-1 |
| Ubuntu 26.04 LTS | linux-raspi | 7.0.0-1014.14 | USN-8488-2 |
| Ubuntu 26.04 LTS | linux-riscv +1 | 7.0.0-27.27.1 | USN-8488-1 |
| Ubuntu 25.10 | linux +8 | No fix yet | — |
| Ubuntu 24.04 LTS | linux +43 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-hwe-7.0 | 7.0.0-28.28~24.04.1 | USN-8569-1 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1035.38 | USN-8781-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | linux +59 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime +3 | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime +2 | No fix yet | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +21 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 +6 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | rv +76 | 6.12.0-211.22.1.el10_2 | RHSA-2026:25191 |
| RHEL 9 | rv +75 | 5.14.0-687.19.1.el9_8 | RHSA-2026:30848 |
| RHEL 8 | kernel-rt +12 | 4.18.0-553.137.1.rt7.478.el8_10 | RHSA-2026:27812 |
| RHEL 8 | perf +26 | 4.18.0-553.137.1.el8_10 | RHSA-2026:27811 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | rv +77 | 6.12.0-55.95.1.el10_0 | RHSA-2026:52764 |
| RHEL 9.6 EUS | rv +77 | 5.14.0-570.132.1.el9_6 | RHSA-2026:52667 |
| RHEL 9.4 E4S | bpftool | 7.3.0-427.143.1.el9_4 | RHSA-2026:51746 |
| RHEL 9.4 E4S | rv +62 | 5.14.0-427.143.1.el9_4 | RHSA-2026:51746 |
| RHEL 9.2 E4S | bpftool | 7.0.0-284.191.1.el9_2 | RHSA-2026:67723 |
| RHEL 9.2 E4S | kernel-rt +14 | 5.14.0-284.191.1.rt14.476.el9_2 | RHSA-2026:67721 |
| RHEL 9.2 E4S | perf +47 | 5.14.0-284.191.1.el9_2 | RHSA-2026:67723 |
| RHEL 8.8 TUS | perf +17 | 4.18.0-477.158.1.el8_8 | RHSA-2026:52649 |
| RHEL 8.8 E4S | perf +18 | 4.18.0-477.158.1.el8_8 | RHSA-2026:52649 |
| RHEL 8.6 EUS Long Life | perf +17 | 4.18.0-372.208.1.el8_6 | RHSA-2026:59473 |
| RHEL 8.6 AUS | perf +17 | 4.18.0-372.208.1.el8_6 | RHSA-2026:59473 |
| RHEL 8.4 EUS Long Life | perf +17 | 4.18.0-305.201.1.el8_4 | RHSA-2026:59091 |
| RHEL 8.4 AUS | perf +17 | 4.18.0-305.201.1.el8_4 | RHSA-2026:59091 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | rv +74 | 6.12.0-211.22.1.el10_2 | ALSA-2026:30129, ALSA-2026:25191 |
| AlmaLinux 9 | rv +73 | 5.14.0-687.19.1.el9_8 | ALSA-2026:30848 |
| AlmaLinux 8 | kernel-rt +9 | 4.18.0-553.137.1.rt7.478.el8_10 | ALSA-2026:27812 |
| AlmaLinux 8 | perf +24 | 4.18.0-553.137.1.el8_10 | ALSA-2026:27811 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kernel | 6.12.0-211.22.1.el10_2 | RLSA-2026:25191 |
| Rocky Linux 8 | kernel | 4.18.0-553.137.1.el8_10 | RLSA-2026:27811 |
| Rocky Linux 8 | kernel-rt | 4.18.0-553.137.1.rt7.478.el8_10 | RLSA-2026:27812 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kernel-source | 7.0.11-1.1 | openSUSE-SU-2026:10954-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.18.36-69.134 +1 | 1:1.0-0.amzn2023 | ALAS2023-2026-1968, ALAS2023-2026-1925 |
| Amazon Linux 2023 | perf6.12 +11 | 1:6.12.94-123.174.amzn2023 | ALAS2023-2026-1968 |
| Amazon Linux 2023 | perf6.18 +12 | 1:6.18.36-69.134.amzn2023 | ALAS2023-2026-1925 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.144.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | rv +29 | 6.12.0-211.34.1.el10_2 | ELSA-2026-25191 |
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-206.104.3.3.el10uek | ELSA-2026-500248 |
| Oracle Linux 9 | rv +28 | 5.14.0-687.19.1.el9_8 | ELSA-2026-30848 |
| Oracle Linux 8 | perf +19 | 4.18.0-553.137.1.el8_10 | ELSA-2026-27811 |
Advisories 38
- RHSA-2026:59091 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:30848 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:59473 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- WID-SEC-2026-1700 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8603-1 linux-azure, linux-azure-fde vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-8781-1 linux-nvidia-tegra vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-8569-1 linux-hwe-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8488-1 linux, linux-aws, linux-gcp, linux-ibm, linux-oracle, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8488-2 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8489-1 linux-oem-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- USN-8507-1 linux-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 7, 2026
- ALSA-2026:30848 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:30129 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:25191 Critical: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27811 Important: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27812 Important: kernel-rt security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:67723 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:67721 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:25191 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-3623 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 18, 2026
- NCSC-2026-0431 Kwetsbaarheden verholpen in IBM DataPower Gateway en onderliggende componenten NCSC-NL (Netherlands) · Oct 16, 2026
- RHSA-2026:52764 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:52649 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- RHSA-2026:51746 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- RHSA-2026:52667 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Sep 16, 2026
- RHSA-2026:27812 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Sep 16, 2026
- RHSA-2026:27811 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Sep 16, 2026
- ELSA-2026-500248 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 4, 2026
- ALAS2023-2026-1968 Important: kernel6.12 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 12, 2026
- ALAS2023-2026-1925 Important: kernel6.18 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 29, 2026
- ELSA-2026-25191 Critical: kernel security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- ELSA-2026-30848 Important: kernel security, bug fix, and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 7, 2026
- RLSA-2026:27811 Important: kernel security update Rocky Linux Security Advisories · Jun 25, 2026
- RLSA-2026:27812 Important: kernel-rt security update Rocky Linux Security Advisories · Jun 25, 2026
- ELSA-2026-27811 Important: kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 23, 2026
- RLSA-2026:25191 Critical: kernel security update Rocky Linux Security Advisories · Jun 13, 2026
- openSUSE-SU-2026:10954-1 kernel-devel-7.0.11-1.1 on GA media SUSE / openSUSE Security Updates · Jun 5, 2026
References
- https://git.kernel.org/stable/c/bc6c380c1159de52a252ed11f19a42c47f60a735
- https://git.kernel.org/stable/c/8bacd09f12c27710228562e4d13163e58c5f4a45
- https://git.kernel.org/stable/c/d844702198395d3f80222777030f69db6be6b709
- https://git.kernel.org/stable/c/cd0e707a927a70cdfd8bc5a512a9719a87f5ed51
- https://git.kernel.org/stable/c/82544d36b1729153c8aeb179e84750f0c085d3b1