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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80901

ipvs: fix the checksum validations

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < d418d73acf8be62744dc47359dfdde8c2148845daffected
  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < b3869d9b54e76dff64118dee4c8fd9302fcd5171affected
  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0affected
  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < 00eb23829fd08df1b5e057cb6b625996a70e7e65affected
  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < 5558a85add073215b298f3e044ff9a6d86d714aeaffected
  • 2a3b791e6e1169f374224d164738e9f7be703d77 to < e876b75b9020a97bbdc79721e7fc749024891c65affected

Linux Linux

Default version status: affected

  • 2.6.28affected
  • 0 to < 2.6.28unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.151 to ≤ 6.6.*unaffected
  • 6.12.103 to ≤ 6.12.*unaffected
  • 6.18.44 to ≤ 6.18.*unaffected
  • 7.1.8 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References