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CVE-2026-80901— ipvs: fix the checksum validations

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 2.6.28版本至7.2之前版本存在安全漏洞，该漏洞源于IPVS对来自客户端的ICMPv6数据包缺少校验和验证，且处理响应时缺少伪头计算，可能导致数据包校验绕过。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P6

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 2a3b791e6e1169f374224d164738e9f7be703d77< d418d73acf8be62744dc47359dfdde8c2148845d affected
2a3b791e6e1169f374224d164738e9f7be703d77< b3869d9b54e76dff64118dee4c8fd9302fcd5171 affected
2a3b791e6e1169f374224d164738e9f7be703d77< 9cbe2c0fdb71904ee929b1851cdc1c73341a03c0 affected
2a3b791e6e1169f374224d164738e9f7be703d77< 00eb23829fd08df1b5e057cb6b625996a70e7e65 affected
2a3b791e6e1169f374224d164738e9f7be703d77< 5558a85add073215b298f3e044ff9a6d86d714ae affected
2a3b791e6e1169f374224d164738e9f7be703d77< e876b75b9020a97bbdc79721e7fc749024891c65 affected
2.6.28 affected
< 2.6.28 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-80901

Vulnerability Information
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Vulnerability Title
ipvs: fix the checksum validations
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 2.6.28版本至7.2之前版本存在安全漏洞，该漏洞源于IPVS对来自客户端的ICMPv6数据包缺少校验和验证，且处理响应时缺少伪头计算，可能导致数据包校验绕过。
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 2a3b791e6e1169f374224d164738e9f7be703d77 ~ d418d73acf8be62744dc47359dfdde8c2148845d -
Linux Linux 2.6.28 -

II. Public POCs for CVE-2026-80901

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III. Intelligence Information for CVE-2026-80901

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Patches & Fixes for CVE-2026-80901 (6)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80901

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