CVE-2026-80901 is a vulnerability in Linux Kernel
Published on September 4, 2026
ipvs: fix the checksum validations
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.
Products Associated with CVE-2026-80901
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Affected Versions
Linux:- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below d418d73acf8be62744dc47359dfdde8c2148845d is affected.
- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below b3869d9b54e76dff64118dee4c8fd9302fcd5171 is affected.
- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0 is affected.
- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below 00eb23829fd08df1b5e057cb6b625996a70e7e65 is affected.
- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below 5558a85add073215b298f3e044ff9a6d86d714ae is affected.
- Version 2a3b791e6e1169f374224d164738e9f7be703d77 and below e876b75b9020a97bbdc79721e7fc749024891c65 is affected.
- Version 2.6.28 is affected.
- Before 2.6.28 is unaffected.
- Version 6.1.183, <= 6.1.* is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.