Use-after-free in Linux kernel - CVE-2026-99212
Published: October 29, 2026
Vulnerability identifier: #VU158370
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-99212
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially cause a denial of service.
The vulnerability exists due to use-after-free in the Linux kernel's rds_rdma_cm_event_handler_cmn() function when RDMA route resolution fails synchronously while handling RDMA_CM_EVENT_ADDR_RESOLVED. A local user can exploit the stale connection identifier retained by RDS after such a failure to potentially cause a kernel crash when connection shutdown accesses and destroys the already freed identifier.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-99212
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2