Description
An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.
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 | 4.17.14-1 | — |
| Debian 13 | linux | 4.17.14-1 | — |
| Debian 12 | linux | 4.17.14-1 | — |
| Debian 9 | linux | 4.9.110-3+deb9u5 | DSA-4308-1 |
| Debian 8 | linux | 3.16.59-1 | DLA-1529-1 |
| Debian 8 | linux-4.9 | 4.9.110-3+deb9u5~deb8u1 | DLA-1531-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | linux | 4.15.0-47.50 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1035.37 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-azure | 4.18.0-1011.11~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp | 4.15.0-1029.31 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1031.31 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1035.40 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1010.12 | USN-3931-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1033.35 | USN-3931-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1035.37~16.04.1 | USN-3931-2 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1041.45 | USN-3931-2 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1029.31~16.04.1 | USN-3931-2 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-47.50~16.04.1 | USN-3931-2 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1010.12~16.04.1 | USN-3931-2 |
| Ubuntu 14.04 LTS | linux-azure | 4.15.0-1041.45~14.04.1 | USN-3931-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SLES 12 SP2 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SLES for SAP 12 SP2 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SUSE OpenStack Cloud 7 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
| SUSE Enterprise Storage 4 | kernel-syms +2 | 4.4.121-92.95.1 | SUSE-SU-2018:3084-1 |
| SUSE Enterprise Storage 4 | kgraft-patch-SLE12-SP2_Update_25 | 1-3.4.1 | SUSE-SU-2018:3084-1 |
| SUSE Enterprise Storage 4 | lttng-modules | 2.7.1-9.6.1 | SUSE-SU-2018:3084-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.19.1.el7uek | ELSA-2018-4242, ELSA-2018-4210 |
| Oracle Linux 7 | perf +5 | 4.14.35-1818.3.3.el7uek | ELSA-2018-4242 |
Advisories 8
- USN-3931-1 linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-oracle, linux-raspi2 vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-3931-2 linux-hwe, linux-aws-hwe, linux-azure, linux-gcp, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- DSA-4308-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1529-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1531-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:3084-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2018-4242 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 10, 2018
- ELSA-2018-4210 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 6, 2018
References
- 1041397 vdb-entry
- [debian-lts-announce] 20181003 [SECURITY] [DLA 1531-1] linux-4.9 security update mailing-list
- https://xenbits.xen.org/xsa/advisory-274.html
- 104924 vdb-entry
- DSA-4308 vendor-advisory
- USN-3931-1 vendor-advisory
- USN-3931-2 vendor-advisory