Description
In the Linux kernel 4.19 through 5.6.7 on the s390 platform, code execution may occur because of a race condition, as demonstrated by code in enable_sacf_uaccess in arch/s390/lib/uaccess.c that fails to protect against a concurrent page table upgrade, aka CID-3f777e19d171. A crash could also occur.
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 | 5.6.7-1 | — |
| Debian 13 | linux | 5.6.7-1 | — |
| Debian 12 | linux | 5.6.7-1 | — |
| Debian 10 | linux | 4.19.98-1+deb10u1 | DSA-4667-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-28.32 | USN-4343-1 |
| Ubuntu 20.04 LTS | linux-gke +1 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-99.100 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1066.70 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-aws-5.3 | 5.3.0-1019.21~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1083.93 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1020.21~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1018.19~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1058.61 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-51.44~18.04.2 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1059.60 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1080.90 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1038.42 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1016.18~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1061.65 | USN-4345-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1023.25~18.04.1 | USN-4342-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1077.84 | USN-4345-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1066.70~16.04.1 | USN-4345-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1082.92~16.04.1 | USN-4345-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1061.65 | USN-4345-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-99.100~16.04.1 | USN-4345-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1038.42~16.04.1 | USN-4345-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1029.34 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | perf +26 | 4.18.0-193.1.2.el8_2 | RHSA-2020:2102 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.1 EUS | perf +26 | 4.18.0-147.13.2.el8_1 | RHSA-2020:2199 |
| RHEL 8.0 E4S | perf +18 | 4.18.0-80.23.2.el8_0 | RHSA-2020:2429 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-193.1.2.el8_2 | ELSA-2020-2102 |
Advisories 9
- RHSA-2020:2429 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:2199 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:2102 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-4342-1 linux, linux-aws, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-oracle-5.3, linux-raspi2, linux-raspi2-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4345-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4343-1 linux vulnerability Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4667-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-2772 Linux Kernel: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · Dec 9, 2025
- ELSA-2020-2102 Important: kernel security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 13, 2020
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3f777e19d171670ab558a6d5e6b1ac7f9b6c574f
- DSA-4667 vendor-advisory
- USN-4343-1 vendor-advisory
- FEDORA-2020-64d46a6e29 vendor-advisory
- FEDORA-2020-16f9239805 vendor-advisory
- FEDORA-2020-b453269c4e vendor-advisory
- USN-4345-1 vendor-advisory
- USN-4342-1 vendor-advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/
- https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=215d1f3928713d6eaec67244bcda72105b898000