CVE-2026-80901ipvs: fix the checksum validations
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2a3b791e6e1169f374224d164738e9f7be703d77 before d418d73acf8be62744dc47359dfdde8c2148845d; from 2a3b791e6e1169f374224d164738e9f7be703d77 before b3869d9b54e76dff64118dee4c8fd9302fcd5171; from 2a3b791e6e1169f374224d164738e9f7be703d77 before 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0; 2a3b791e6e1169f374224d164738e9f7be703d77 builds before 00eb23829fd08df1b5e057cb6b625996a70e7e65; from 2a3b791e6e1169f374224d164738e9f7be703d77 before 5558a85add073215b298f3e044ff9a6d86d714ae; from 2a3b791e6e1169f374224d164738e9f7be703d77 before e876b75b9020a97bbdc79721e7fc749024891c65 | CNA record |
References
- https://git.kernel.org/stable/c/d418d73acf8be62744dc47359dfdde8c2148845d
- https://git.kernel.org/stable/c/b3869d9b54e76dff64118dee4c8fd9302fcd5171
- https://git.kernel.org/stable/c/9cbe2c0fdb71904ee929b1851cdc1c73341a03c0
- https://git.kernel.org/stable/c/00eb23829fd08df1b5e057cb6b625996a70e7e65
- https://git.kernel.org/stable/c/5558a85add073215b298f3e044ff9a6d86d714ae
- https://git.kernel.org/stable/c/e876b75b9020a97bbdc79721e7fc749024891c65
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.