UNKNOWN NVD
CVE-2026-89776
In the Linux kernel, the following vulnerability has been resolved: vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes The VXLAN VNI filter ent
In the Linux kernel, the following vulnerability has been resolved:
vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes
The VXLAN VNI filter entry policy declares the GROUP/GROUP6 address
attributes as NLA_BINARY with only a maximum length, so validate_nla()
accepts a payload shorter than the address. The GROUP consumer reads it
with nla_get_in_addr(), an unconditional 4-byte load, so a short
attribute over-reads up to 3 bytes of uninitialised slab data, which are
stored into remote_ip and echoed back via RTM_GETTUNNEL, disclosing
kernel memory.
Switch both entries to NLA_POLICY_EXACT_LEN() so the validator rejects
any GROUP/GROUP6 that is not exactly 4 / 16 bytes; a valid address is
always sent at full width.
References
- https://git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea
- https://git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e
- https://git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324
- https://git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b
- https://git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c
This unknown severity vulnerability was published on 2026-09-16 via NVD.
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