# CVE-2025-39768: linux: In the Linux kernel, the following vulnerability has been resolved: net/mlx5: HWS, fix complex rules rehash error fl... CVE-2025-39768 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2025-39768, released September 11, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-39768 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0013 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Sep 11, 2025 ## Description In the Linux kernel, the following vulnerability has been resolved: net/mlx5: HWS, fix complex rules rehash error flow Moving rules from matcher to matcher should not fail. However, if it does fail due to various reasons, the error flow should allow the kernel to continue functioning (albeit with broken steering rules) instead of going into series of soft lock-ups or some other problematic behaviour. Similar to the simple rules, complex rules rehash logic suffers from the same problems. This patch fixes the error flow for moving complex rules: - If new rule creation fails before it was even enqeued, do not poll for completion - If TIMEOUT happened while moving the rule, no point trying to poll for completions for other rules. Something is broken, completion won't come, just abort the rehash sequence. - If some other completion with error received, don't give up. Continue handling rest of the rules to minimize the damage. - Make sure that the first error code that was received will be actually returned to the caller instead of replacing it with the generic error code. All the aforementioned issues stem from the same bad error flow, so no point fixing them one by one and leaving partially broken code - fixing them in one patch. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | kernel-uek ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-devel ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-devel ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-deprecated ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-deprecated ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-desktop ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-desktop ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-extra ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-extra-netfilter ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-extra-netfilter ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-usb ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-usb ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-wireless ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-debug-modules-wireless ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-devel ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-devel ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-doc ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-doc ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-deprecated ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-deprecated ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-desktop ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-desktop ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-extra ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-extra ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-extra-netfilter ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-extra-netfilter ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-usb ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-usb ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-wireless ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-modules-wireless ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-tools ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek-tools ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-devel ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-devel ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-core ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-core ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-deprecated ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-deprecated ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-desktop ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-desktop ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-extra ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-extra ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-extra-netfilter ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-extra-netfilter ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-usb ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-usb ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-wireless ol 10 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | kernel-uek64k-modules-wireless ol 9 | 0:6.12.0-205.92.4.2.el9uek | [ELSA-2026-500150](https://patchblox.com/security/data/fix/linux/elsa-2026-500150.md) | Aug 8, 2026 | | Linux | linux Debian 14 | 6.16.5-1 | [DEBIAN-CVE-2025-39768](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39768.md) | Sep 11, 2025 | --- Data as of 2026-11-08T13:06:02Z UTC. 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