Answer in brief
CVE-2026-89776 records a Unknown severity vulnerability in vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <e12c4663529699f457b2988c1dfedf4d13b3b3be || >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <47bfcc871576eaef6c8edab6749acd4b317306ea || >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <a9ec10815199f9879ba080241dc555efb1daf324 || >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <daebc7064a1b4c12c98e52c4bceede7f2fcd573c || >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <ad32e564c62ebf5ba76dd60a22af52c69d54d17b || >=f9c4bb0b245cee35ef66f75bf409c9573d934cf9 <984f831dda31b3a18f47454cf64989f65402879e | e12c4663529699f457b2988c1dfedf4d13b3b3be, 47bfcc871576eaef6c8edab6749acd4b317306ea, a9ec10815199f9879ba080241dc555efb1daf324, daebc7064a1b4c12c98e52c4bceede7f2fcd573c, ad32e564c62ebf5ba76dd60a22af52c69d54d17b, 984f831dda31b3a18f47454cf64989f65402879e |
| Linux/Linuxgeneric | 5.18 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
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.
Quoted source text, attributed separately from HOL analysis.