# CVE-2026-74593: linux: In the Linux kernel, the following vulnerability has been resolved: sched_ext: Take cgroup_lock() first in scx_cgrou... CVE-2026-74593 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-74593, released September 4, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-74593 - Priority: High - CVSS: n/a (important) - EPSS: 0.0017 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 22, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: sched_ext: Take cgroup_lock() first in scx_cgroup_lock() scx_cgroup_lock() write-locks scx_cgroup_ops_rwsem and then takes cgroup_lock(), which can deadlock through kernfs: scx enable/disable cgroup rmdir cpu.weight write ------------------ ------------ ---------------- cgroup_lock() percpu_down_write(rwsem) cgroup_lock() kernfs_get_active() percpu_down_read(rwsem) kernfs_drain() The enable path waits for the rmdir to release cgroup_mutex. The rmdir, deactivating the cpu controller's files, waits in kernfs_drain() for the write's active reference. The write, in scx_group_set_weight(), waits for the rwsem behind the pending writer. Take cgroup_lock() first. The set_* paths take no cgroup locks inside the read side, so a pending write-lock then only waits for read sections that always run to completion, and no dependency from the rwsem back to cgroup_mutex remains. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.18 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | bpftool6.18-debuginfo amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel-livepatch-6.18.48-107.148 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-debuginfo amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-debuginfo-common-aarch64 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-debuginfo-common-x86_64 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-devel amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-headers amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-modules-extra amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-modules-extra-common amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-tools amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-tools-debuginfo amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | kernel6.18-tools-devel amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | linux Debian 14 | 7.1.9-1 | [DEBIAN-CVE-2026-74593](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74593.md) | Sep 4, 2026 | | Linux | microvm-kernel6.18 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | perf6.18 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | perf6.18-debuginfo amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | python3-perf6.18 amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | | Linux | python3-perf6.18-debuginfo amzn 2023 | 1:6.18.48-107.148.amzn2023 | [ALAS2023-2026-3139](https://patchblox.com/security/data/fix/linux/alas2023-2026-3139.md) | Sep 28, 2026 | --- Data as of 2026-11-09T01:18:40Z UTC. 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