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CVE-2026-72020— ipvs: reset full ip_vs_seq structs in ip_vs_conn_new

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存在安全漏洞，该漏洞源于ip_vs_conn_new函数未完全重置ip_vs_seq结构体，导致init_seq和previous_delta未初始化，攻击者利用恶意同步消息可使转发报文携带过期slab数据并破坏TCP流。

CVSS 9.8 · Critical EPSS 0.69% · P50

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9a05475cebdd6341884b5901e53870be26e65158< 3bf9a260188b2a5449cbddc032a749ab433fe328 affected
9a05475cebdd6341884b5901e53870be26e65158< 6378c5cb360eb1750f88839d7c3613ea92ac1816 affected
9a05475cebdd6341884b5901e53870be26e65158< 32c299e28b8eea6cbbd23b97dc61401e9ef9c445 affected
9a05475cebdd6341884b5901e53870be26e65158< 9e36602cbec552286f7e691cfd366525c565ee74 affected
9a05475cebdd6341884b5901e53870be26e65158< d0eed7177e822cab83141e5c44b2aa345c7fd379 affected
9a05475cebdd6341884b5901e53870be26e65158< 83fb4c2c5344f02eac929f66de3c9d1adfcde04c affected
9a05475cebdd6341884b5901e53870be26e65158< 6335ab62d5fc9ed875279238233fba3462c168f5 affected
9a05475cebdd6341884b5901e53870be26e65158< 2975324d164c552b028632f107b567302863b7f6 affected
… +10 more rows
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I. Basic Information for CVE-2026-72020

Vulnerability Information
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Vulnerability Title
ipvs: reset full ip_vs_seq structs in ip_vs_conn_new
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipvs: reset full ip_vs_seq structs in ip_vs_conn_new Commit 9a05475cebdd ("ipvs: avoid kmem_cache_zalloc in ip_vs_conn_new") changed ip_vs_conn_new() to allocate an ip_vs_conn object with kmem_cache_alloc(). The function then initializes many fields explicitly, but only resets in_seq.delta and out_seq.delta in the two struct ip_vs_seq members. That leaves init_seq and previous_delta uninitialized. This is normally harmless while the corresponding IP_VS_CONN_F_IN_SEQ or IP_VS_CONN_F_OUT_SEQ flag is clear. For connections learned from a sync message, however, ip_vs_proc_conn() preserves those flags from IP_VS_CONN_F_BACKUP_MASK and passes opt=NULL when the message omits IPVS_OPT_SEQ_DATA. In that case the new connection can be hashed with SEQ flags set but with the rest of in_seq/out_seq still containing stale slab data. When a packet for such a connection is later handled by an IPVS application helper, vs_fix_seq() and vs_fix_ack_seq() use previous_delta and init_seq to rewrite TCP sequence numbers. A malformed sync message can therefore make forwarded packets carry stale slab bytes in their TCP seq/ack numbers, and can also corrupt the forwarded TCP flow. Reset both struct ip_vs_seq members completely before publishing the connection. This matches the existing "reset struct ip_vs_seq" comment and keeps the sequence-adjustment gates inactive unless valid sequence data is installed later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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存在安全漏洞，该漏洞源于ip_vs_conn_new函数未完全重置ip_vs_seq结构体，导致init_seq和previous_delta未初始化，攻击者利用恶意同步消息可使转发报文携带过期slab数据并破坏TCP流。
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 9a05475cebdd6341884b5901e53870be26e65158 ~ 3bf9a260188b2a5449cbddc032a749ab433fe328 -
Linux Linux 3.10 -

II. Public POCs for CVE-2026-72020

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III. Intelligence Information for CVE-2026-72020

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Patches & Fixes for CVE-2026-72020 (8)

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

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-2026-74475 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-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74376 9.8 CRITICAL md/raid10: reset read_slot when reusing r10bio for discard
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72398 9.8 CRITICAL sctp: add INIT verification after cookie unpacking
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72442 9.8 CRITICAL netfilter: flowtable: fix and simplify IP6IP6 tunnel handling
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72046 9.8 CRITICAL gve: fix header buffer corruption with header-split and HW-GRO
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion

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-2026-72020

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