Memory leak in Linux kernel - CVE-2026-90108
Published: September 19, 2026
Vulnerability identifier: #VU151379
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90108
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a memory leak.
The vulnerability exists due to improper memory management in smc_llc_event_handler() when handling an ADD_LINK request after a CONFIRM_LINK or ADD_LINK_CONT message has been stashed during the SMC_LLC_FLOW_REQ_ADD_LINK state. A remote attacker can send a sequence of LLC messages to cause a memory leak.
The overwritten stashed entry is a kmalloc allocation with no consumer in this flow state.
Affected software
Linux kernel
How to mitigate CVE-2026-90108
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae
- https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a
- https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b
- https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad
- https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311
- https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85