Strix
64.1K

CVE-2026-89776

Unknown

Last modified

CVE-2026-89776 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < e12c4663529699f457b2988c1dfedf4d13b3b3be; >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < 47bfcc871576eaef6c8edab6749acd4b317306ea; >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < a9ec10815199f9879ba080241dc555efb1daf324; >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < daebc7064a1b4c12c98e52c4bceede7f2fcd573c; >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < ad32e564c62ebf5ba76dd60a22af52c69d54d17b; >= f9c4bb0b245cee35ef66f75bf409c9573d934cf9, < 984f831dda31b3a18f47454cf64989f65402879e
LinuxLinux5.18

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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 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 severe is CVE-2026-89776?
Severity scoring for CVE-2026-89776 is pending analysis.
How do I fix CVE-2026-89776?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-89776?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST