vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes
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.
CVE-2026-89776
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89776
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "e12c4663529699f457b2988c1dfedf4d13b3b3be",
"versionType": "git"
},
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "47bfcc871576eaef6c8edab6749acd4b317306ea",
"versionType": "git"
},
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "a9ec10815199f9879ba080241dc555efb1daf324",
"versionType": "git"
},
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "daebc7064a1b4c12c98e52c4bceede7f2fcd573c",
"versionType": "git"
},
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "ad32e564c62ebf5ba76dd60a22af52c69d54d17b",
"versionType": "git"
},
{
"status": "affected",
"version": "f9c4bb0b245cee35ef66f75bf409c9573d934cf9",
"lessThan": "984f831dda31b3a18f47454cf64989f65402879e",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/vxlan/vxlan_vnifilter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.18",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/vxlan/vxlan_vnifilter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89776
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35242 · Revision 1
- Added to Heist Feed
- Publisher date