CVE-2026-80590— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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，该漏洞源于在IPv4/IPv6分片重组前未正确剥离GSO状态，导致重组后的数据包被错误传递给skb_segment()并触发内核BUG_ON，可能导致拒绝服务。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f43798c27684ab925adde7d8acc34c78c6e50df8< cfdbc8c2e6f9ef5d8b8e54859da03dfe682b0bee |
affected |
f43798c27684ab925adde7d8acc34c78c6e50df8< 29dda278a5ed272f2230ff4eaa23cf403107bba0 |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< 14a8f3e10fa9a5abd6cedcdaa0c0b7ea9a09f234 |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< 3edf721bb4b99d272c336631b44e3d8ff9a4f31b |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< dec2edb7aaf12a8878b3a03172ea8fc277b8eaad |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< c49f04e8d2b94dbb8d9fd99731dd3f00589c8ace |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< 69b73b74d9eb45f5560a8fe4fa406ada580e1340 |
affected | ||
f43798c27684ab925adde7d8acc34c78c6e50df8< da857e448322a2e871ce3ecc2900027041160d43 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2026-80590 基础信息
漏洞信息
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Vulnerability Title
inet: frags: strip GSO state from fragments before reassembly
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
inet: frags: strip GSO state from fragments before reassembly
A virtio_net_hdr (tun/tap, or AF_PACKET with PACKET_VNET_HDR) can mark
an IPv4 or IPv6 fragment as GSO; nothing relates gso_type to frag_off.
inet_frag_reasm_prepare()/inet_frag_reasm_finish() keep the first
fragment's skb as the head of the reassembled datagram, including its
shinfo->gso_size/gso_type/gso_segs, and chain the remaining fragments
on frag_list with whatever linear/paged layout they arrived with.
After ip_defrag() (ip_local_deliver(), nf_defrag_ipv4, ...) the
reassembled skb therefore still claims to be GSO (SKB_GSO_DODGY), and
the next software segmentation point - udp_rcv_segment() on local
delivery, validate_xmit_skb(), or the ip_finish_output_gso() slow
path - hands it to skb_segment(). skb_segment()'s frag_list walk
assumes GRO-shaped input and hits one of its BUG_ON()s. Two writes to
a tap by an unprivileged user in its own userns are enough:
kernel BUG at net/core/skbuff.c:4899!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 1000 PID: 82 Comm: poc Not tainted 7.2.0-pentest+ #2
RIP: 0010:skb_segment+0x20ca/0x48b0
Call Trace:
<TASK>
__udp_gso_segment+0x29a/0x27d0
udp4_ufo_fragment+0x458/0x6c0
inet_gso_segment+0x429/0x1340
skb_mac_gso_segment+0x233/0x4f0
__skb_gso_segment+0x308/0x660
udp_queue_rcv_skb+0x440/0xad0
udp_unicast_rcv_skb+0xc7/0x2c0
udp_rcv+0x16ce/0x2260
ip_protocol_deliver_rcu+0x197/0x2d0
ip_local_deliver+0x430/0x690
ip_rcv+0x16f/0x1f0
__netif_receive_skb_one_core+0x15e/0x1c0
__netif_receive_skb+0x1e/0x110
netif_receive_skb+0xf6/0x5c0
tun_rx_batched.isra.0+0x3ab/0x790
tun_get_user+0x17c3/0x3550
tun_chr_write_iter+0xba/0x1b0
vfs_write+0x646/0x1130
</TASK>
Kernel panic - not syncing: Fatal exception in interrupt
This runs with BH disabled, so it is a panic rather than an oops. The
same is reachable with CAP_NET_RAW in a netns where a defrag point
precedes a GSO point, and from a guest whose VMM forwards
virtio_net_hdr to a tap. The SKB_GSO_DODGY frag_list checks added by
commit 3dcbdb134f32 ("net: gso: Fix skb_segment splat when splitting
gso_size mangled skb having linear-headed frag_list") and by
commit 9e4b7a99a03a ("net: gso: fix panic on frag_list with mixed head
alloc types") do not cover it: page-backed heads skip them, and kmalloc
heads skip them when gso_size == skb_headlen(head), which the sender
controls.
An skb entering a frag queue is an IP fragment by definition and
cannot legitimately carry GSO state: GRO does not merge fragments and
the stack segments before it fragments, so only untrusted sources are
affected. This has been reachable since
commit f43798c27684 ("tun: Allow GSO using virtio_net_hdr"), the first
path that let userspace attach GSO metadata to an IP fragment. Reset
the GSO fields of every fragment as it is queued, in
inet_frag_queue_insert(), which IPv4, IPv6, nf_conntrack_reasm and
6lowpan reassembly share; then neither the head nor the frag_list
members of the reassembled skb carry them (the members matter too:
the ip_do_fragment()/ip6_fragment() fast paths send them out as they
are). The head may remain CHECKSUM_PARTIAL; that is already accepted
on receive and resolved by skb_checksum_help() in
ip_do_fragment()/ip6_fragment() on forward.
Tested on top of net.git (dc4b95b8fee9), x86_64: the tap reproducer
above, two further IPv4 frag_list geometries that reach
BUG_ON(i >= nfrags) and BUG_ON(!list_skb->head_frag), and an IPv6
fragment-header variant (udp6_ufo_fragment()) each panic the unpatched
kernel; with this patch all four datagrams are delivered intact and
nothing is logged.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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，该漏洞源于在IPv4/IPv6分片重组前未正确剥离GSO状态，导致重组后的数据包被错误传递给skb_segment()并触发内核BUG_ON，可能导致拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-80590 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80590 补丁与修复 (8)
CVE-2026-80590 其他参考 (1)
同批安全公告 · Linux · 2026-08-28 · 共 135 条
| CVE-2026-80674 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80630 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80617 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80612 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80634 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80609 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80694 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80668 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80714 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80600 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80673 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80681 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80684 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80671 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80693 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80603 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80670 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80633 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-80638 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-80722 | 8.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 135 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80590
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