CVE-2026-72021High· 8.2▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport offset in SCTP state lookup set_sctp_state() reads the SCTP chunk header again in order to drive the IPVS SCTP state table. For IPv6 it comp…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.6%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
ipvs: use parsed transport offset in SCTP state lookup
set_sctp_state() reads the SCTP chunk header again in order to drive the IPVS SCTP state table. For IPv6 it computes the offset with sizeof(struct ipv6hdr), while the surrounding IPVS code uses iph.len from ip_vs_fill_iph_skb(), where ipv6_find_hdr() has already skipped extension headers and found the real transport header.
This makes the state machine read from the wrong offset for IPv6 SCTP packets that carry extension headers. For example, an INIT packet with an 8-byte destination options header can be scheduled correctly by sctp_conn_schedule(), but set_sctp_state() reads the first byte of the SCTP verification tag as a DATA chunk type. The connection then moves from NONE to ESTABLISHED instead of INIT1, gets the longer established timeout, and updates the active/inactive destination counters incorrectly. This happens even though the SCTP handshake has not completed.
Use the parsed transport offset passed down from ip_vs_set_state() for the SCTP chunk-header lookup. For IPv4 and IPv6 packets without extension headers this preserves the existing offset.
Linux >= 2906f66a5682e5670a5eefe991843689b8d8563f < d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27Linux >= 2906f66a5682e5670a5eefe991843689b8d8563f < 9f94573ab962a9e81954b755da016fa3cd2f5039Linux >= 2906f66a5682e5670a5eefe991843689b8d8563f < 290e9e8389b556efc603522e28bd1543846aa336Linux >= 2906f66a5682e5670a5eefe991843689b8d8563f < 9cb5ac594ca76d3a71803b23b74c835b0721e628Linux >= 2906f66a5682e5670a5eefe991843689b8d8563f < a4a2d2e483d79cc2ad3a170674cf159644acf22bLinux >= 2906f66a5682e5670a5eefe991843689b8d8563f < 247d055504dcc852e539b9f7f30d19f9741474bfLinux >= 2906f66a5682e5670a5eefe991843689b8d8563f < e5d0bb8871668f20de8f3c94b5ae3f372346bc6eLinux >= 2906f66a5682e5670a5eefe991843689b8d8563f < 2f75c0faa3361b28e36cc0512b3299e163e25789Linux 2.6.34Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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