CVE-2026-89776
Description
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.
How to fix
- Linux Linuxe12c4663529699f457b2988c1dfedf4d13b3b3be, 47bfcc871576eaef6c8edab6749acd4b317306ea, a9ec10815199f9879ba080241dc555efb1daf324, daebc7064a1b4c12c98e52c4bceede7f2fcd573c, ad32e564c62ebf5ba76dd60a22af52c69d54d17b, 984f831dda31b3a18f47454cf64989f65402879e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < e12c4663529699f457b2988c1dfedf4d13b3b3be, f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < 47bfcc871576eaef6c8edab6749acd4b317306ea, f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < a9ec10815199f9879ba080241dc555efb1daf324, f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < daebc7064a1b4c12c98e52c4bceede7f2fcd573c, f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < ad32e564c62ebf5ba76dd60a22af52c69d54d17b, f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ≤ v < 984f831dda31b3a18f47454cf64989f65402879e, 5.18 | e12c4663529699f457b2988c1dfedf4d13b3b3be, 47bfcc871576eaef6c8edab6749acd4b317306ea, a9ec10815199f9879ba080241dc555efb1daf324, daebc7064a1b4c12c98e52c4bceede7f2fcd573c, ad32e564c62ebf5ba76dd60a22af52c69d54d17b, 984f831dda31b3a18f47454cf64989f65402879e |
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