Linux Kernel up to 7.2.5 vxlan validate_nla out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.45

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. The affected element is the function validate_nla of the component vxlan. Such manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-89776. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5 and classified as problematic. Affected by this issue is the function validate_nla of the component vxlan. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-89776 since 09/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/16/2026).

Upgrading to version 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch e12c4663529699f457b2988c1dfedf4d13b3b3be/47bfcc871576eaef6c8edab6749acd4b317306ea/a9ec10815199f9879ba080241dc555efb1daf324/daebc7064a1b4c12c98e52c4bceede7f2fcd573c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b/984f831dda31b3a18f47454cf64989f65402879e is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: e12c4663529699f457b2988c1dfedf4d13b3b3be/47bfcc871576eaef6c8edab6749acd4b317306ea/a9ec10815199f9879ba080241dc555efb1daf324/daebc7064a1b4c12c98e52c4bceede7f2fcd573c/ad32e564c62ebf5ba76dd60a22af52c69d54d17b/984f831dda31b3a18f47454cf64989f65402879e

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89776 (🔒)
GCVE (CVE): GCVE-0-2026-89776
GCVE (VulDB): GCVE-100-405554

Entryinfo

Created: 09/16/2026 10:59
Changes: 09/16/2026 10:59 (59)
Complete: 🔍
Cache ID: 216::103

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