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CVE-2026-80850— 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 6.7版本存在安全漏洞，该漏洞源于TCP-AO连接初始化中处理设备VRF分离时存在竞争条件，可能导致释放后重用，攻击者可利用该漏洞导致内核崩溃。

AI 预测 7.1 利用难度: 困难 EPSS 0.17% · P6

可能的 ATT&CK 技术 1 AI

T1555 · Credentials from Password Stores

影响版本矩阵 12

厂商产品 版本范围状态
Linux Linux 248411b8cb8974a1e1c8e43123c1e682fbd64969< 594ba77210a1f065832211851a2d7e14d11fcbdb affected
248411b8cb8974a1e1c8e43123c1e682fbd64969< 70051a57786d5b23f059fbaf5c8241eca14d42ed affected
248411b8cb8974a1e1c8e43123c1e682fbd64969< 284d7fd0eec8774bd6214921fbf525cf907c590e affected
248411b8cb8974a1e1c8e43123c1e682fbd64969< d17e88b6b60ff4ef64e0dd1444f935cb13dee1cd affected
248411b8cb8974a1e1c8e43123c1e682fbd64969< ea30dc5267e367b8a5e1e06cc074f813bcbf18b2 affected
6.7 affected
< 6.7 unaffected
6.12.108≤ 6.12.* unaffected
… +4 条更多
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一、 漏洞 CVE-2026-80850 基础信息

漏洞信息
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Vulnerability Title
tcp: fix AO info use-after-free in tcp_ao_connect_init()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tcp: fix AO info use-after-free in tcp_ao_connect_init() tcp_v4_connect() adds a SYN-SENT socket to the ehash before calling tcp_connect(). If TCP-AO is configured, tcp_connect() first verifies that a key matches the peer and the bound device's current L3 master. tcp_ao_connect_init() later resolves the L3 master again and removes keys which do not match it. The socket lock does not stabilize the bound device's VRF membership. Detaching the device from its VRF between the initial validation and the L3-master calculation in tcp_ao_connect_init() can therefore make the validation succeed while initialization observes the default L3 domain and removes the only key. The subsequent AO lookup then fails, so the no-key path clears tp->ao_info and frees it directly. The receive path can find the socket in the ehash and load tp->ao_info under RCU before acquiring the socket lock. A reader which loaded the old pointer can thus continue into tcp_inbound_ao_hash() after the direct free. The issue was found during a static audit of TCP-AO object lifetime. An unprivileged reproducer in self-created user and network namespaces raced connect() with detaching a veth from its VRF while sending TCP-AO segments. It triggered the same KASAN report on two fresh boots: BUG: KASAN: slab-use-after-free in tcp_inbound_ao_hash+0x585/0x19f0 Write of size 8 at addr ffff88800bf88128 by task tcp_ao_vrf_race/232 Call Trace: tcp_inbound_ao_hash+0x585/0x19f0 tcp_inbound_hash+0x677/0xa80 tcp_v4_rcv+0x1c3e/0x3ab0 Allocated by task 235: tcp_ao_alloc_info+0x43/0xf0 tcp_ao_add_cmd+0xdf7/0x13b0 do_tcp_setsockopt+0x168c/0x2640 Freed by task 235: kfree+0x1b8/0x550 tcp_connect+0x252/0x4f00 tcp_v4_connect+0x1114/0x1720 The bad address is 40 bytes inside the freed 128-byte object, matching the tcp_ao_info counters.key_not_found field. The two runs used 1000 attempts each, reached the no-key path 366 and 411 times, and produced one and two KASAN reports respectively. With this change, the same reproducer reached the no-key path 366 times in 1000 attempts without a KASAN report or oops. Use tcp_ao_destroy_sock() for the no-key path. It unpublishes the AO info, updates the socket memory and static-key accounting, and defers the free until after an RCU grace period. Also drop the WARN_ON_ONCE() and its stale comment. The VRF detach race makes the no-key state reachable during normal operation, so it is a handled condition rather than an impossible assertion. On panic_on_warn kernels the WARN would turn this handled race into a kernel panic.
来源: CVE Program / CVE List V5
CVSS Information
N/A
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 6.7版本存在安全漏洞，该漏洞源于TCP-AO连接初始化中处理设备VRF分离时存在竞争条件，可能导致释放后重用，攻击者可利用该漏洞导致内核崩溃。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux 248411b8cb8974a1e1c8e43123c1e682fbd64969 ~ 594ba77210a1f065832211851a2d7e14d11fcbdb -
Linux Linux 6.7 -

二、漏洞 CVE-2026-80850 的公开POC

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三、漏洞 CVE-2026-80850 的情报信息

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CVE-2026-80850 补丁与修复 (5)

同批安全公告 · Linux · 2026-09-04 · 共 156 条

CVE-2026-80865 Linux kernel 安全漏洞
CVE-2026-80856 Linux kernel 安全漏洞
CVE-2026-80857 Linux kernel 安全漏洞
CVE-2026-80858 Linux kernel 安全漏洞
CVE-2026-80859 Linux kernel 安全漏洞
CVE-2026-80860 Linux kernel 安全漏洞
CVE-2026-80861 Linux kernel 安全漏洞
CVE-2026-80862 Linux kernel 安全漏洞
CVE-2026-80863 Linux kernel 安全漏洞
CVE-2026-80864 Linux kernel 安全漏洞
CVE-2026-80870 Linux kernel 安全漏洞
CVE-2026-80874 Linux kernel 安全漏洞
CVE-2026-80873 Linux kernel 安全漏洞
CVE-2026-80872 Linux kernel 安全漏洞
CVE-2026-80871 Linux kernel 安全漏洞
CVE-2026-80868 Linux kernel 安全漏洞
CVE-2026-80866 Linux kernel 安全漏洞
CVE-2026-80867 Linux kernel 安全漏洞
CVE-2026-80855 Linux kernel 安全漏洞
CVE-2026-80869 Linux kernel 安全漏洞

显示前 20 条，共 156 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80850

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