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OpenAdvisories
Unscored CVE-2023-52633 EUVD-2023-57257GHSA-c7h5-f667-cvc5

um: time-travel: fix time corruption

Published Apr 2, 2024 · Updated May 11, 2026 · Assigned by Linux

Vendor: Linux Product: Linux Package: linux Package: linux Package: linux-aws Package: linux-aws-5.15 Package: linux-aws-fips Package: linux-azure Package: linux-azure-5.15 Package: linux-azure-6.5 Package: linux-azure-fde Package: linux-azure-fips Package: linux-bluefield Package: linux-fips Package: linux-gcp Package: linux-gcp-5.15 Package: linux-gcp-6.5 Package: linux-gcp-fips Package: linux-gke Package: linux-gkeop Package: linux-gkeop-5.15 Package: linux-hwe-5.15 Package: linux-hwe-6.5 Package: linux-ibm Package: linux-ibm-5.15 Package: linux-intel-iot-realtime Package: linux-intel-iotg Package: linux-intel-iotg-5.15 Package: linux-kvm Package: linux-lowlatency Package: linux-lowlatency-hwe-5.15 Package: linux-lowlatency-hwe-6.5 Package: linux-nvidia Package: linux-nvidia-6.5 Package: linux-nvidia-tegra Package: linux-nvidia-tegra-5.15 Package: linux-nvidia-tegra-igx Package: linux-oem-6.5 Package: linux-oracle Package: linux-oracle-5.15 Package: linux-oracle-6.5 Package: linux-raspi Package: linux-raspi-realtime Package: linux-realtime Package: linux-riscv-5.15 Package: linux-riscv-6.5 Package: linux-starfive-6.5 Package: linux-vmware Package: linux-xilinx-zynqmp Platform: Linux Ecosystem: Debian Ecosystem: Ubuntu

Description

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

um: time-travel: fix time corruption

In 'basic' time-travel mode (without =inf-cpu or =ext), we
still get timer interrupts. These can happen at arbitrary
points in time, i.e. while in timer_read(), which pushes
time forward just a little bit. Then, if we happen to get
the interrupt after calculating the new time to push to,
but before actually finishing that, the interrupt will set
the time to a value that's incompatible with the forward,
and we'll crash because time goes backwards when we do the
forwarding.

Fix this by reading the time_travel_time, calculating the
adjustment, and doing the adjustment all with interrupts
disabled.

Affected products

VendorProductAffectedFixed
Linux Linux 5.3 5.15.149

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 ↗
ReleasePackageFixed inAdvisory
Debian 14 linux 6.7.7-1 —
Debian 13 linux 6.7.7-1 —
Debian 12 linux 6.1.82-1 —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu Nvidia-BlueField 22.04 LTS linux-bluefield 5.15.0-1043.45 —
Ubuntu 22.04 LTS linux +1 5.15.0-106.116 USN-6766-1
Ubuntu 22.04 LTS linux-aws 5.15.0-1061.67 USN-6766-3
Ubuntu 22.04 LTS linux-azure 5.15.0-1063.72 USN-6766-1
Ubuntu 22.04 LTS linux-azure-6.5 6.5.0-1022.23~22.04.1 USN-6819-1
Ubuntu 22.04 LTS linux-azure-fde 5.15.0-1063.72.1 USN-6766-1
Ubuntu 22.04 LTS linux-gcp 5.15.0-1059.67 USN-6766-1
Ubuntu 22.04 LTS linux-gcp-6.5 6.5.0-1022.24~22.04.1 USN-6818-1
Ubuntu 22.04 LTS linux-gke +1 5.15.0-1058.63 USN-6766-1
Ubuntu 22.04 LTS linux-gkeop 5.15.0-1044.51 USN-6766-1
Ubuntu 22.04 LTS linux-hwe-6.5 6.5.0-41.41~22.04.2 USN-6818-4
Ubuntu 22.04 LTS linux-ibm +1 5.15.0-1054.57 USN-6766-2, USN-6766-1
Ubuntu 22.04 LTS linux-intel-iotg 5.15.0-1057.63 USN-6795-1
Ubuntu 22.04 LTS linux-lowlatency-hwe-6.5 6.5.0-41.41.1~22.04.1 USN-6818-1
Ubuntu 22.04 LTS linux-nvidia 5.15.0-1054.55 USN-6766-1
Ubuntu 22.04 LTS linux-nvidia-6.5 6.5.0-1021.22 USN-6818-3
Ubuntu 22.04 LTS linux-nvidia-tegra 5.15.0-1026.26 —
Ubuntu 22.04 LTS linux-nvidia-tegra-igx 5.15.0-1015.15 —
Ubuntu 22.04 LTS linux-oem-6.5 6.5.0-1024.25 USN-6819-3
Ubuntu 22.04 LTS linux-oracle 5.15.0-1059.65 USN-6766-1
Ubuntu 22.04 LTS linux-oracle-6.5 6.5.0-1024.24~22.04.1 USN-6819-4
Ubuntu 22.04 LTS linux-riscv-6.5 6.5.0-40.40.1~22.04.1 —
Ubuntu 22.04 LTS linux-starfive-6.5 6.5.0-1015.16~22.04.1 USN-6819-1
Ubuntu 22.04 LTS linux-xilinx-zynqmp 5.15.0-1030.34 —
Ubuntu 20.04 LTS linux-aws-5.15 5.15.0-1061.67~20.04.1 USN-6766-3
Ubuntu 20.04 LTS linux-azure-5.15 5.15.0-1063.72~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-azure-fde-5.15 5.15.0-1063.72~20.04.1.1 USN-6766-1
Ubuntu 20.04 LTS linux-gcp-5.15 5.15.0-1059.67~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-gkeop-5.15 5.15.0-1044.51~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-hwe-5.15 +1 5.15.0-106.116~20.04.1 USN-6766-2, USN-6766-1
Ubuntu 20.04 LTS linux-ibm-5.15 5.15.0-1054.57~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-intel-iotg-5.15 5.15.0-1058.64~20.04.1 USN-6828-1
Ubuntu 20.04 LTS linux-nvidia-tegra-5.15 5.15.0-1027.27~20.04.1 —
Ubuntu 20.04 LTS linux-oracle-5.15 5.15.0-1059.65~20.04.1 USN-6766-1
Ubuntu 20.04 LTS linux-riscv-5.15 5.15.0-1057.61~20.04.1 —
Show 3 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu Pro Realtime 24.04 LTS linux-raspi-realtime 6.8.0-2001.1 —
Ubuntu Pro Realtime 22.04 LTS linux-intel-iot-realtime 5.15.0-1054.56 —
Ubuntu Pro Realtime 22.04 LTS linux-realtime 5.15.0-1062.70 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-aws-fips 5.15.0-1061.67+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-azure-fips 5.15.0-1063.72+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-fips 5.15.0-106.116+fips1 —
Ubuntu Pro FIPS-updates 22.04 LTS linux-gcp-fips 5.15.0-1059.67+fips1 —

Advisories 12

References