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CVE-2026-72021— ipvs: use parsed transport offset in SCTP state lookup

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于在IPv6 SCTP数据包携带扩展头时，set_sctp_state()函数错误计算SCTP块头偏移量，可能导致SCTP连接状态机解析错误，造成连接状态异常及活动/非活动目标计数器更新错误。

CVSS 8.2 · High EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2906f66a5682e5670a5eefe991843689b8d8563f< d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27 affected
2906f66a5682e5670a5eefe991843689b8d8563f< 9f94573ab962a9e81954b755da016fa3cd2f5039 affected
2906f66a5682e5670a5eefe991843689b8d8563f< 290e9e8389b556efc603522e28bd1543846aa336 affected
2906f66a5682e5670a5eefe991843689b8d8563f< 9cb5ac594ca76d3a71803b23b74c835b0721e628 affected
2906f66a5682e5670a5eefe991843689b8d8563f< a4a2d2e483d79cc2ad3a170674cf159644acf22b affected
2906f66a5682e5670a5eefe991843689b8d8563f< 247d055504dcc852e539b9f7f30d19f9741474bf affected
2906f66a5682e5670a5eefe991843689b8d8563f< e5d0bb8871668f20de8f3c94b5ae3f372346bc6e affected
2906f66a5682e5670a5eefe991843689b8d8563f< 2f75c0faa3361b28e36cc0512b3299e163e25789 affected
… +10 more rows
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I. Basic Information for CVE-2026-72021

Vulnerability Information
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Vulnerability Title
ipvs: use parsed transport offset in SCTP state lookup
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 2.6.34版本存在安全漏洞，该漏洞源于在IPv6 SCTP数据包携带扩展头时，set_sctp_state()函数错误计算SCTP块头偏移量，可能导致SCTP连接状态机解析错误，造成连接状态异常及活动/非活动目标计数器更新错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2906f66a5682e5670a5eefe991843689b8d8563f ~ d2b8b1557ec07ea1bb5dddbceaf4dfe63d388e27 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-72021

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III. Intelligence Information for CVE-2026-72021

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Patches & Fixes for CVE-2026-72021 (7)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72451 9.8 CRITICAL xfrm: Fix xfrm state cache insertion race
CVE-2026-72323 9.8 CRITICAL ipv4: igmp: Fix potential UAF in igmp_gq_start_timer()
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work
CVE-2026-72436 9.8 CRITICAL netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types
CVE-2026-72129 9.8 CRITICAL nvmet-rdma: handle inline data with a nonzero offset
CVE-2026-72130 9.8 CRITICAL nvmet-auth: reject short AUTH_RECEIVE buffers
CVE-2026-72206 9.8 CRITICAL ntfs: validate index block header more strictly
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72137 9.8 CRITICAL xfrm: nat_keepalive: avoid double free on send error
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72021

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