Quick answers
- Is CVE-2026-99280 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-99280 being exploited in the wild.
- How severe is CVE-2026-99280?
- Informational severity, published 7 November 2026.
- Which products and versions are affected?
- Linux Kernel multiple versions with ksmbd enabled.
- Is there a fix for CVE-2026-99280?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-99280 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-99280?
- Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a use-after-free race condition in ksmbd's session management where procfs readers can hold references to session data after the underlying file table has been freed. Session registration failure and connection cleanup paths were prematurely dropping table references while per-session procfs entries remained accessible. The fix ensures procfs entries are removed before reference drops and uses a deferred disposal queue to prevent concurrent unregister operations from accessing freed memory.
Affected products
- Linux Linux kernel multiple versions with ksmbd enabled
Timeline
- 2026-11-07: disclosed
- 2026-10-17: other: Commit authored