CVE-2026-80994— 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，该漏洞源于处理CMD_DEL删除流时未先获取RCU读锁，导致ovs_flow_cmd_fill_info()在流被释放后使用flow->mask指针，可能造成释放后重用并导致崩溃。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 56c19868e115fcf8d62d843e1b9616bb9837d0db< ea5f7b45b582665541ddfb77dce98611354af4ab |
affected |
56c19868e115fcf8d62d843e1b9616bb9837d0db< 18ce1a8b7499c016d4a893d9b1db80608f73745d |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< c15ef9a5bf594f93a31de2ec2ec394e2a903519a |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< 64051fe200c7c759af71634bd2123552eaabb69a |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< 0ba5cbc2f049af94ec94ff6f64958545efc5eaa2 |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< ac73e3af571da06c1d1cfe3f0f00dc978b851700 |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< 7f072b84afd05a77963eb1872f7174e280661dce |
affected | ||
56c19868e115fcf8d62d843e1b9616bb9837d0db< 4e30317ff67a2eb12b4d890d39f72fd7e7117d48 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-80994 基础信息
漏洞信息
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Vulnerability Title
net: openvswitch: fix flow mask use-after-free on flow deletion
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: openvswitch: fix flow mask use-after-free on flow deletion
The commit in the Fixes tag below made so flow->mask free is scheduled
via RCU right after it is removed from the flow table. The pointer
stays in the flow structure and it can be accessible while in the same
RCU critical section. This is done to avoid requiring ovs_mutex for
the ovs_flow_free().
However, while removing the flow during processing of CMD_DEL, we do
not take RCU read lock before the removal, and ovs_flow_cmd_fill_info()
uses the flow->mask pointer afterwards. The RCU read lock is taken,
but it's already late at that point. The comment on that line
acknowledges that the lock is cosmetic and doesn't serve a real purpose.
This leads to use-after-free if the RCU grace period passes between
removal and the filling. It is a short race window, but it is there
and can lead to a real crash in case memory allocation for the info
takes a bit longer:
BUG: KASAN: slab-use-after-free in __ovs_nla_put_key
net/openvswitch/flow_netlink.c:1996
BUG: KASAN: slab-use-after-free in ovs_nla_put_key+0x2463/0x2e30
net/openvswitch/flow_netlink.c:2250
Read of size 4 at addr ffff88801ee89970 by task ovs_flow_del_ec/9487
Call Trace:
<TASK>
__ovs_nla_put_key net/openvswitch/flow_netlink.c:1996
ovs_nla_put_key+0x2463/0x2e30 net/openvswitch/flow_netlink.c:2250
ovs_flow_cmd_fill_info+0x420/0x9c0 net/openvswitch/datapath.c:930
ovs_flow_cmd_del+0x53a/0x970 net/openvswitch/datapath.c:1467
...
netlink_rcv_skb+0x156/0x420 net/netlink/af_netlink.c:2556
</TASK>
Allocated by task 9487:
mask_alloc net/openvswitch/flow_table.c:967
flow_mask_insert net/openvswitch/flow_table.c:1012
ovs_flow_tbl_insert+0xea2/0x1a90 net/openvswitch/flow_table.c:1084
ovs_flow_cmd_new+0x7e3/0xd90 net/openvswitch/datapath.c:1086
...
netlink_rcv_skb+0x156/0x420 net/netlink/af_netlink.c:2556
Freed by task 9485:
rcu_free_sheaf+0x1e/0x100 mm/slub.c:5978
rcu_do_batch kernel/rcu/tree.c:2645
rcu_core+0x59c/0x10c0 kernel/rcu/tree.c:2897
handle_softirqs+0x1e4/0x9a0 kernel/softirq.c:622
...
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062
ovs_flow_tbl_remove() must be called after the ovs_flow_cmd_fill_info()
to avoid this race. This also helps with cleaning up the forced cast
and the cosmetic RCU read lock. Before the commit in the Fixes tag the
order did not matter as long as the flow object itself was not freed.
A wider RCU critical section could be another option, but we have a
GFP_KERNEL allocation in the way.
Reported by Trend Micro's Zero Day Initiative as ZDI-CAN-32042.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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，该漏洞源于处理CMD_DEL删除流时未先获取RCU读锁，导致ovs_flow_cmd_fill_info()在流被释放后使用flow->mask指针，可能造成释放后重用并导致崩溃。
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-2026-80994 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80994 补丁与修复 (8)
同批安全公告 · Linux · 2026-09-11 · 共 430 条
| CVE-2026-89703 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89689 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89558 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89555 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89550 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89551 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89546 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89542 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89541 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89538 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89533 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89530 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89526 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-81002 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89482 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89478 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89479 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-89485 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-80986 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 430 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80994
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