Linux Kernel up to 7.1.7 ipvs ip_vs_in_icmp_v6 input validation

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.45

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.182/6.6.150/6.12.102/6.18.43/7.1.7. It has been declared as very critical. This affects the function ip_vs_in_icmp_v6 of the component ipvs. Such manipulation leads to input validation. This vulnerability is traded as CVE-2026-80901. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.182/6.6.150/6.12.102/6.18.43/7.1.7. It has been rated as very critical. Affected by this issue is the function ip_vs_in_icmp_v6 of the component ipvs. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ipvs: fix the checksum validations ip_vs_in_icmp_v6() is missing checksum validation for ICMPv6 packets from clients. In fact, as for TCP/UDP we should validate the checksum for ICMP packets only when we mangle the packets on MASQ or on reply for tunnel. Also, Sashiko points out that handle_response_icmp() being common for IPv4 and IPv6 is missing the pseudo-header calculation while validating ICMPv6 messages from real servers which is a problem if checksum is not validated by the hardware. Fix the problems by creating ip_vs_checksum_common_check() helper and use it for TCP/UDP/ICMP both for IPv4 and IPv6. Rely on the nf_checksum() for validating the ICMP messages but use it also for TCP and UDP. Use correct IP offset for IP_VS_DBG_RL_PKT for TCP/UDP/SCTP. IPVS packets (TCP/UDP/SCTP/ICMP) do not need checksum validation on LOCAL_OUT (local clients or local real servers) and on FORWARD (traffic from servers on LAN). Do it only on LOCAL_IN, in case nf_checksum() is not called on PRE_ROUTING. Also, ip_vs_checksum_complete() can be marked static.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-80901 since 08/26/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/04/2026).

Upgrading to version 6.1.183, 6.6.151, 6.12.103, 6.18.44 or 7.1.8 eliminates this vulnerability. Applying the patch d418d73acf8be62744dc47359dfdde8c2148845d/b3869d9b54e76dff64118dee4c8fd9302fcd5171/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0/00eb23829fd08df1b5e057cb6b625996a70e7e65/5558a85add073215b298f3e044ff9a6d86d714ae/e876b75b9020a97bbdc79721e7fc749024891c65 is able to eliminate this problem.

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Productinfo

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Version

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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

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

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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 6.1.183/6.6.151/6.12.103/6.18.44/7.1.8
Patch: d418d73acf8be62744dc47359dfdde8c2148845d/b3869d9b54e76dff64118dee4c8fd9302fcd5171/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0/00eb23829fd08df1b5e057cb6b625996a70e7e65/5558a85add073215b298f3e044ff9a6d86d714ae/e876b75b9020a97bbdc79721e7fc749024891c65

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80901 (🔒)
GCVE (CVE): GCVE-0-2026-80901
GCVE (VulDB): GCVE-100-399104

Entryinfo

Created: 09/04/2026 19:39
Changes: 09/04/2026 19:39 (59)
Complete: 🔍
Cache ID: 216::103

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