CVE-2026-43088

About vulnerability

In the Linux kernel, the following vulnerability has been resolved:

net: af_key: zero aligned sockaddr tail in PF_KEY exports

PF_KEY export paths use pfkey_sockaddr_size() when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, pfkey_sockaddr_fill() initializes only the first 28 bytes of struct sockaddr_in6, leaving the final 4 aligned bytes uninitialized.

Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain skb_put():

• SADB_ACQUIRE
• SADB_X_NAT_T_NEW_MAPPING
• SADB_X_MIGRATE

Fix those paths by clearing only the aligned sockaddr tail after pfkey_sockaddr_fill().

Affected product:

AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , CentOS 6 ELS , CentOS 7 ELS , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 7 ELS , Debian 10 ELS , Oracle Linux 6 ELS , Oracle Linux 7 ELS , RHEL 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS

Affected packages:

kernel-uek @ 5.4.17 (+17 more)

Live-patch status from KernelCare for each operating system.