Linux Kernel up to 7.3-rc4 VXLAN vxlan_na_create memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$5k-$25k0.92

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.157/6.12.111/6.18.54/7.2.8/7.3-rc4. It has been rated as very critical. This impacts the function vxlan_na_create of the component VXLAN. Performing a manipulation results in memory corruption. This vulnerability is cataloged as CVE-2026-98568. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.157/6.12.111/6.18.54/7.2.8/7.3-rc4. It has been classified as very critical. This affects the function vxlan_na_create of the component VXLAN. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: vxlan: use one headroom snapshot for neighbour replies vxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then samples it again to reserve headroom. A concurrent vxlan_changelink() can update needed_headroom between the two reads, creating a TOCTOU race. The second value can exceed the allocation and make the Ethernet header write out of bounds. The race is reproducible on the unpatched kernel. It occurred when vxlan_na_create() generated a neighbour reply while vxlan_changelink() changed the link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte skbuff_small_head allocation. Snapshot the headroom once and use that value for both allocation and reservation.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98568 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/18/2026).

Upgrading to version 6.6.158, 6.12.112, 6.18.55, 7.2.9 or 7.3-rc5 eliminates this vulnerability. Applying the patch 45a67662bf8ce3aa5643accf98d328dfbb47eaf6/315d42ca39f69846662961c25dcf2bb07c350d14/a3c5eb6e382dd426a5e7eb08608897ed57167ff7/ff022fd9d0f0282c575e11778b96bd1b637503eb/481506a756dcd828ef42391cb08f38d8d96d38fc is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: 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 6.6.158/6.12.112/6.18.55/7.2.9/7.3-rc5
Patch: 45a67662bf8ce3aa5643accf98d328dfbb47eaf6/315d42ca39f69846662961c25dcf2bb07c350d14/a3c5eb6e382dd426a5e7eb08608897ed57167ff7/ff022fd9d0f0282c575e11778b96bd1b637503eb/481506a756dcd828ef42391cb08f38d8d96d38fc

Timelineinfo

09/25/2026 CVE reserved
10/18/2026 +23 days Advisory disclosed
10/18/2026 +0 days VulDB entry created
10/18/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98568 (🔒)
GCVE (CVE): GCVE-0-2026-98568
GCVE (VulDB): GCVE-100-422079

Entryinfo

Created: 10/18/2026 20:13
Changes: 10/18/2026 20:13 (59)
Complete: 🔍
Cache ID: 216::103

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