CVE-2026-74593sched_ext: Take cgroup_lock() first in scx_cgroup_lock()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from a5bd6ba30b3364354269b81ac55c2edca9a96d6d before 2ca6b43edf83f8fc368cc3094ee5f3b1e8e0b0f0; from a5bd6ba30b3364354269b81ac55c2edca9a96d6d before a054c9ffa9b7a0dffb763837b91ac9d381ec6d10; from a5bd6ba30b3364354269b81ac55c2edca9a96d6d before 5f8b69642d18e1f3e11996707842ac530444e959 | CNA record |
References
- https://git.kernel.org/stable/c/2ca6b43edf83f8fc368cc3094ee5f3b1e8e0b0f0
- https://git.kernel.org/stable/c/a054c9ffa9b7a0dffb763837b91ac9d381ec6d10
- https://git.kernel.org/stable/c/5f8b69642d18e1f3e11996707842ac530444e959
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.