nvme: add missing SRCU grace period in error path
CVE-2026-89972 · published 16 Sept 2026
How serious is it
- Severity: critical, CVSS score 9.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-89972?
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Who is affected
- Linux Linux: ed754e5deeb17f4e675c84e4b6c640cc7344e498 to < 3868476cd39161f18720582df17a1b621e805b5d, ed754e5deeb17f4e675c84e4b6c640cc7344e498 to < 0d4735418512ef825176726eaaa8bd6a35f6b46d, ed754e5deeb17f4e675c84e4b6c640cc7344e498 to < d663944dbad81bb0e3635d7090db4713e6300858, ed754e5deeb17f4e675c84e4b6c640cc7344e498 to < 76023560d60f10b4f808941163aa2975f1631683
- Linux Linux: 4.15
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
nvme: add missing SRCU grace period in error path
nvme_alloc_ns() error path at out_unlink_ns removes ns from the
namespace head siblings list with list_del_rcu(&ns->siblings) but
does not wait for SRCU readers before freeing the namespace struct.
Multipath code iterates the head->list under srcu_read_lock() in
nvme_find_path() and nvme_mpath_revalidate_paths(), so a concurrent
reader can still hold a reference to ns when kfree(ns) runs.
The normal removal path in nvme_ns_remove() correctly calls
synchronize_srcu(&ns->head->srcu) after list_del_rcu() to wait for
in-progress readers. Add the same grace period in the error path.
Check your whole app
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References
- git.kernel.org/stable/c/3868476cd39161f18720582df17a1b621e805b5d
- git.kernel.org/stable/c/0d4735418512ef825176726eaaa8bd6a35f6b46d
- git.kernel.org/stable/c/d663944dbad81bb0e3635d7090db4713e6300858
- git.kernel.org/stable/c/76023560d60f10b4f808941163aa2975f1631683
- git.kernel.org/stable/c/ef248d5de4469fb6bbaf8dbe0c4c47800080d648
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON