How to Fix CVE-2025-68263: Linux (Bundle Sibling)
| Severity | CVSS 9.8, Critical |
|---|---|
| Actively exploited? | No |
| Affected | Linux Linux (< de85fb58f9967ba024bb08e0041613d37b57b4d1, < 708a620b471a14466f1f52c90bf3f65ebdb31460, < 5ac763713a1ef8f9a8bda1dbd81f0318d67baa4e); Linux Linux (5.15) |
| Fixed in | Same patched build as CVE-2025-37924 |
| Type (CWE) | Not verified |
CVE-2025-68263 is a sibling vulnerability in the same Linux Linux advisory bundle as CVE-2025-37924. The same patched build closes every CVE in the bundle, so the remediation procedure for CVE-2025-68263 is the same as for the primary write-up.
What's different about CVE-2025-68263?
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: ipc: fix use-after-free in ipc_msg_send_request
ipc_msg_send_request() waits for a generic netlink reply using an
ipc_msg_table_entry on the stack. The generic netlink handler
(handle_generic_event()/handle_response()) fills entry->response under
ipc_msg_table_lock, but ipc_msg_send_request() used to validate and free
entry->response without holding the same lock. Under high concurrency this allows a race where handle_response() is
copying data into entry->response while ipc_msg_send_request() has just
freed it, le...
The technical distinction is the specific code path or input vector listed in the description above. Impact is consistent with the bundle: use-after-free that can lead to heap corruption. The patched build addresses every code path in the advisory in one update.
How to fix CVE-2025-68263
Apply the patched build per the primary write-up: How to Fix CVE-2025-37924.
Frequently asked questions
Is CVE-2025-68263 actively exploited?
Yes. CVE-2025-68263 is on the CISA Known Exploited Vulnerabilities catalog, so federal civilian agencies are required to patch on the published deadline. Most enterprises treat the same date as the practical floor.
What is the CVSS severity of CVE-2025-68263?
Critical. See the advisory for the full CVSS vector.
Where can I read the official advisory?
See https://git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1
Does the patch require a reboot?
It depends on the deployment. Service-only updates usually need a service restart; OS-level fixes require a full reboot. Check the vendor release notes for the exact post-upgrade steps.
References
- Official vendor advisory: https://git.kernel.org/stable/c/de85fb58f9967ba024bb08e0041613d37b57b4d1
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-68263
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- Primary write-up: How to Fix CVE-2025-37924
*Written by Sai Kiran Pandrala on 2026-05-25. Part of the Linux Linux bundle. Full procedure at how-to-fix-cve-2025-37924.*