Linux Kernel up to 7.2-rc5 VXLAN route_shortcircuit out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.48

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc5. Impacted is the function route_shortcircuit of the component VXLAN. The manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2026-74473. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.150/6.12.102/6.18.43/7.1.7/7.2-rc5. This issue affects the function route_shortcircuit 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, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: vxlan: use pskb_network_may_pull() in route_shortcircuit() route_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr)) (or ipv6hdr), which checks if bytes are available starting from skb->data. However, in vxlan_xmit(), skb->data points to the MAC header, so skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20) only checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of IP header), leaving the rest of the IP header potentially un-pulled in non-linear frags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled linear buffer length. Fix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to the length check to ensure the full network header is present in the linear buffer.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-74473 since 08/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 6.6.151, 6.12.103, 6.18.44, 7.1.8 or 7.2-rc6 eliminates this vulnerability. Applying the patch 42887be7c4cf283cce02cd0fb6411221167c8b6c/aa0d31376d574ac858a40078431a77127bf04ee4/ee799977d7941dbfb11049e17edd9eaf4f8820f7/4f3f96e771a20263635bb5e1307c112d613b4bbd/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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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 6.6.151/6.12.103/6.18.44/7.1.8/7.2-rc6
Patch: 42887be7c4cf283cce02cd0fb6411221167c8b6c/aa0d31376d574ac858a40078431a77127bf04ee4/ee799977d7941dbfb11049e17edd9eaf4f8820f7/4f3f96e771a20263635bb5e1307c112d613b4bbd/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74473 (🔒)
GCVE (CVE): GCVE-0-2026-74473
GCVE (VulDB): GCVE-100-390791

Entryinfo

Created: 08/15/2026 15:10
Changes: 08/15/2026 15:10 (59)
Complete: 🔍
Cache ID: 216::103

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