CVE-2026-74593
CVE CVE-2026-74593EUVD EUVD-2026-64530Published 2026-08-22T15:31:44.000ZLast changed 2026-08-23T12:47:36.000Z
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 6.18.46; a5bd6ba30b3364354269b81ac55c2edca9a96d6d <a054c9ffa9b7a0dffb763837b91ac9d381ec6d10; 6.18; a5bd6ba30b3364354269b81ac55c2edca9a96d6d <5f8b69642d18e1f3e11996707842ac530444e959; patch: 7.1.9; patch: 7.2; a5bd6ba30b3364354269b81ac55c2edca9a96d6d <2ca6b43edf83f8fc368cc3094ee5f3b1e8e0b0f0; patch: 0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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