# CVE-2023-52633: linux: In the Linux kernel, the following vulnerability has been resolved:  um: time-travel: fix time corruption  In 'basic'...

CVE-2023-52633 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52633, released April 2, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52633
- Priority: Routine
- CVSS: 5.0 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 2, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.82-1 | [DEBIAN-CVE-2023-52633](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52633.md) | Apr 2, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.7.7-1 | [DEBIAN-CVE-2023-52633](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52633.md) | Apr 2, 2024 |
| Linux | linux Debian 14 | 6.7.7-1 | [DEBIAN-CVE-2023-52633](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52633.md) | Apr 2, 2024 |

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