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CVE-2026-52991 is a Linux kernel vulnerability in the sched/psi and cgroup code path caused by a race between pressure_write() and cgroup file release. The flaw involves the priv member of struct kernfs_open_file, which stores a ctx object used by pressure_write(). During concurrent cgroup teardown, cgroup_file_release() can free that ctx object and clear of->priv while pressure_write() is still operating on it. Because accesses to of->priv inside pressure_write() were not fully synchronized with cgroup_mutex, pressure_write() could retrieve or dereference a stale ctx pointer after it had been freed, resulting in a use-after-free. A second race window exists after cgroup_kn_lock_live() succeeds but before cgroup_mutex is acquired, allowing another operation to release the file and set of->priv to NULL, which can lead to a NULL pointer dereference when pressure_write() accesses ctx->psi.trigger. The fix expands cgroup_mutex coverage in pressure_write(), moves retrieval of ctx until after the live kernfs node lock is acquired, and adds handling for the case where of->priv is NULL.
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A Linux kernel use-after-free and possible NULL dereference vulnerability caused by a race condition between pressure_write() and cgroup file release in sched/psi and cgroup handling.
A Linux kernel race condition vulnerability in sched/psi involving file release and pressure write operations.
A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A Linux kernel vulnerability in sched/psi caused by a race condition between file release and pressure write.
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