vxlan: vnifilter: enforce exact length of GROUP/GROUP6 attributes
Summary
| CVE | CVE-2026-89776 |
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| State | PUBLISHED |
|---|
| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-16 09:17:07 UTC |
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| Updated | 2026-09-16 09:17:07 UTC |
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| 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 e12c4663529699f457b2988c1dfedf4d13b3b3be git |
Not specified |
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 47bfcc871576eaef6c8edab6749acd4b317306ea git |
Not specified |
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 a9ec10815199f9879ba080241dc555efb1daf324 git |
Not specified |
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 daebc7064a1b4c12c98e52c4bceede7f2fcd573c git |
Not specified |
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 ad32e564c62ebf5ba76dd60a22af52c69d54d17b git |
Not specified |
| CNA |
Linux |
Linux |
affected f9c4bb0b245cee35ef66f75bf409c9573d934cf9 984f831dda31b3a18f47454cf64989f65402879e git |
Not specified |
| CNA |
Linux |
Linux |
affected 5.18 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.18 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.188 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.157 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.110 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.52 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.6 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/984f831dda31b3a18f47454cf64989f65402879e |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/e12c4663529699f457b2988c1dfedf4d13b3b3be |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/a9ec10815199f9879ba080241dc555efb1daf324 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/47bfcc871576eaef6c8edab6749acd4b317306ea |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/daebc7064a1b4c12c98e52c4bceede7f2fcd573c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.