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Update linux-whatsnew.md
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defender-endpoint/linux-whatsnew.md

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This article is updated frequently to let you know what's new in the latest releases of Microsoft Defender for Endpoint on Linux.
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> [!IMPORTANT]
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> Starting with version `101.24082.0004`, Defender for Endpoint on Linux no longer supports the `Auditd` event provider. We're transitioning completely to the more efficient eBPF technology. This change allows for better performance, reduced resource consumption, and overall improved stability. eBPF support has been available since August 2023, and is fully integrated into all updates of Defender for Endpoint on Linux (version `101.23082.0006` and later). We strongly encourage you to adopt the eBPF build, as it provides significant enhancements over Auditd. If eBPF is not supported on your machines, or if there are specific requirements to remain on Auditd, you have the following options:
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> Starting with version `101.24082.0004`, Defender for Endpoint on Linux no longer supports the `Auditd` event provider. We're transitioning completely to the more efficient eBPF technology. This change allows for better performance, reduced resource consumption, and overall improved stability. eBPF support has been available since August 2023, and is fully integrated into all updates of Defender for Endpoint on Linux (version `101.23082.0006` and later). We strongly encourage you to adopt the eBPF build, as it provides significant enhancements over Auditd. If eBPF isn't supported on your machines, or if there are specific requirements to remain on Auditd, you have the following options:
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>
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> 1. Continue to use Defender for Endpoint on Linux build `101.24072.0000` with Auditd. This build will continue to be supported for several months, so you have time to plan and execute your migration to eBPF.
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> 1. Continue to use Defender for Endpoint on Linux build `101.24072.0000` with Auditd. This build continues to be supported for several months, so you have time to plan and execute your migration to eBPF.
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>
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> 2. If you are on versions later than `101.24072.0000`, Defender for Endpoint on Linux relies on `netlink` as a backup supplementary event provider. In the event of a fallback, all process operations continue to flow seamlessly.
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#### What's new
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- The default engine version has been updated to 1.1.24080.11, and the default signature version has been updated to 1.419.351.0.
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- The default engine version has been updated to `1.1.24080.11`, and the default signature version has been updated to `1.419.351.0`.
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- Improved the reporting of command-line threat information for short lived processes on the security portal.
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#### What's new
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- To support hardened installations with non-executable `/var` partitions, mdatp AV definitions will now install to `/opt/microsoft/mdatp/definitions.noindex` instead of `/var` if the latter is detected as non-executable. During upgrades, the installer will attempt to migrate older definitions to the new path upon detecting a non-executable `/var`, unless it finds that the path has already been customized (using `mdatp definitions path set`).
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- To support hardened installations with nonexecutable `/var` partitions, mdatp antivirus definitions will now install to `/opt/microsoft/mdatp/definitions.noindex` instead of `/var` if the latter is detected as nonexecutable. During upgrades, the installer attempts to migrate older definitions to the new path upon detecting a nonexecutable `/var`, unless it finds that the path has already been customized (using `mdatp definitions path set`).
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- Beginning with this version, Defender for Endpoint on Linux no longer needs executable permissions for `/var/log`. If these permissions are not available, log files are automatically redirected to `/opt`.
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- Beginning with this version, Defender for Endpoint on Linux no longer needs executable permissions for `/var/log`. If these permissions aren't available, log files are automatically redirected to `/opt`.
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### Oct-2024 Build: 101.24082.0004 | Release version: 30.124082.0004.0
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#### What's new
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- Starting this version, Defender for Endpoint on Linux no longer supports `AuditD` as a supplementary event provider. For improved stability and performance, we have completely transitioned to eBPF. If you disable eBPF, or in the event eBPF is not supported on any specific kernel, Defender for Endpoint on Linux automatically switches back to Netlink as a fallback supplementary event provider. Netlink provides reduced functionality and tracks only process-related events. In this case, all process operations continue to flow seamlessly, but you could miss specific file and socket-related events that eBPF would otherwise capture. For more details, see [Use eBPF-based sensor for Microsoft Defender for Endpoint on Linux](linux-support-ebpf.md). If you have any concerns or need assistance during this transition, contact support.
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- Starting this version, Defender for Endpoint on Linux no longer supports `AuditD` as a supplementary event provider. For improved stability and performance, we have transitioned to eBPF. If you disable eBPF, or in the event eBPF isn't supported on any specific kernel, Defender for Endpoint on Linux automatically switches back to Netlink as a fallback supplementary event provider. Netlink provides reduced functionality and tracks only process-related events. In this case, all process operations continue to flow seamlessly, but you could miss specific file and socket-related events that eBPF would otherwise capture. For more information, see [Use eBPF-based sensor for Microsoft Defender for Endpoint on Linux](linux-support-ebpf.md). If you have any concerns or need assistance during this transition, contact support.
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- Stability and performance improvements
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- Other bug fixes
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There are multiple fixes and new changes in this release.
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- Fixes bug in which infected command-line threat information was not showing correctly in security portal.
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- Fixes bug in which infected command-line threat information wasn't showing correctly in security portal.
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- Fixes a bug where disabling a preview feature required a Defender of Endpoint to disable it.
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- Global Exclusions feature using managed JSON is now in Public Preview. available in insiders slow from 101.23092.0012. For more information, see [linux-exclusions](linux-exclusions.md).
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- Updated the Linux default engine version to 1.1.24050.7 and default signature version to 1.411.410.0.
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There are multiple fixes and new changes in this release.
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- This release fixes a bug related to high memory usage eventually leading to high CPU due to eBPF memory leak in kernel space resulting in servers going into unusable states. This only impacted the kernel versions 3.10x and <= 4.16x, majorly on RHEL/CentOS distros. Please update to the latest MDE version to avoid any impact.
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- This release fixes a bug related to high memory usage eventually leading to high CPU due to eBPF memory leak in kernel space resulting in servers going into unusable states. This only impacted the kernel versions 3.10x and <= 4.16x, majorly on RHEL/CentOS distros. Update to the latest MDE version to avoid any impact.
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- We have now simplified the output of `mdatp health --detail features`
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- Stability and performance improvements.
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- Other bug fixes.
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There are multiple fixes and new changes in this release:
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- In passive and on-demand modes, antivirus engine remains in idle state and is used only during scheduled custom scans. Thus as part of performance improvements, we have made changes to keep the AV engine down in passive and on-demand mode except during scheduled custom scans. If the real time protection is enabled, antivirus engine will always be up and running. This will have no impact on your server protection in any mode.
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- In passive and on-demand modes, antivirus engine remains in idle state and is used only during scheduled custom scans. Thus as part of performance improvements, we have made changes to keep the AV engine down in passive and on-demand mode except during scheduled custom scans. If the real time protection is enabled, antivirus engine will always be up and running. This has no impact on your server protection in any mode.
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To keep users informed of the state of antivirus engine, we have introduced a new field called "engine_load_status" as part of MDATP health. It indicates whether antivirus engine is currently running or not.
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There are multiple fixes and new changes in this release:
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- The addition of a new log file - `microsoft_defender_scan_skip.log`. This will log the filenames that were skipped from various antivirus scans by Microsoft Defender for Endpoint due to any reason.
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- The addition of a new log file - `microsoft_defender_scan_skip.log`. This logs the filenames that were skipped from various antivirus scans by Microsoft Defender for Endpoint due to any reason.
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- Stability and performance improvements.
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- Bug fixes.
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| Alma 8.4 and higher | Insiders Slow | https://packages.microsoft.com/config/alma/8/insiders-slow.repo |
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| Alma 9.2 and higher | Insiders Slow | https://packages.microsoft.com/config/alma/9/insiders-slow.repo |
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If you already have Defender for Endpoint running on any of these distros and facing any issues in the older versions, please upgrade to the latest Defender for Endpoint version from the corresponding ring mentioned above. Refer our [public deployment docs](comprehensive-guidance-on-linux-deployment.md) for more details.
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If you already have Defender for Endpoint running on any of these distros and facing any issues in the older versions, upgrade to the latest Defender for Endpoint version from the corresponding ring mentioned above. Refer our [public deployment docs](comprehensive-guidance-on-linux-deployment.md) for more details.
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> [!NOTE]
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> Known issues:

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