CVE-2026-68420— 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xfrm模块未正确拒绝出站策略中的可选IPTFS模板，可能导致栈越界读取。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d1716d5a44c37e5743bf6ea4e5cdbdab37727f27< d7fc6f351c478586980a521d63b0214d9c055e78 |
affected |
d1716d5a44c37e5743bf6ea4e5cdbdab37727f27< 9333f4b6f44858fc98eb12bf26b8d2959eb975d5 |
affected | ||
d1716d5a44c37e5743bf6ea4e5cdbdab37727f27< ea528f18231ec0f33317be57f8866913b19aba6e |
affected | ||
6.14 |
affected | ||
< 6.14 |
unaffected | ||
6.18.42≤ 6.18.* |
unaffected | ||
7.1.6≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-68420 基础信息
漏洞信息
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Vulnerability Title
xfrm: reject optional IPTFS templates in outbound policies
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfrm: reject optional IPTFS templates in outbound policies
syzbot reported a stack-out-of-bounds read in xfrm_state_find()
which flows from xfrm_tmpl_resolve_one().
Commit 3d776e31c841 ("xfrm: Reject optional tunnel/BEET mode
templates in outbound policies") disallowed optional tunnel and
BEET in outbound policies to prevent this. Later when IPTFS
added, it was not covered by that fix and can still trigger
the out-of-bounds read;
Extend the check to disallow optional IPTFS in outbound policies
as well. IPTFS should be identical to tunnel mode.
IN and FWD policies are not affected: xfrm_tmpl_resolve_one()
is only reachable via the outbound path.
Reproducer, before:
ip link add dummy0 type dummy
ip link set dummy0 up
ip addr add 10.1.1.1/24 dev dummy0
ip xfrm policy add src 10.1.1.1/32 dst 10.1.1.2/32 dir out tmpl
src fc00::dead:1 dst fc00::dead:2 proto esp reqid 1 mode iptfs
level use tmpl src fc00::dead:1 dst fc00::dead:2 proto esp reqid
2 mode transport
ping -W 1 -c 1 10.1.1.2
PING 10.1.1.2 (10.1.1.2) 56(84) bytes of data.
[ 64.168420] ==================================================================
[ 64.169977] BUG: KASAN: stack-out-of-bounds in __xfrm6_addr_hash+0x11e/0x170
[ 64.169977] Read of size 4 at addr ffff88800e1ffd20 by task ping/2844
[ 64.169977] CPU: 2 UID: 0 PID: 2844 Comm: ping Not tainted 7.1.0-rc7-00180-geb23b588430a #98 PREEMPT(full)
[ 64.169977] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 64.169977] Call Trace:
[ 64.169977] <TASK>
[ 64.169977] dump_stack_lvl+0x47/0x70
[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170
[ 64.169977] print_report+0x152/0x4b0
[ 64.169977] ? ksys_mmap_pgoff+0x6d/0xa0
[ 64.169977] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 64.169977] ? rcu_read_unlock_sched+0xa/0x20
[ 64.169977] ? __virt_addr_valid+0x21b/0x230
[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170
[ 64.169977] kasan_report+0xa8/0xd0
[ 64.169977] ? __xfrm6_addr_hash+0x11e/0x170
[ 64.169977] __xfrm6_addr_hash+0x11e/0x170
[ 64.169977] __xfrm_dst_hash+0x24/0xc0
[ 64.169977] xfrm_state_find+0xa2d/0x2f90
[ 64.169977] ? __pfx_xfrm_state_find+0x10/0x10
[ 64.169977] ? __pfx_ftrace_graph_ret_addr+0x10/0x10
[ 64.169977] ? __pfx_ftrace_graph_ret_addr+0x10/0x10
[ 64.169977] xfrm_tmpl_resolve_one+0x210/0x570
[ 64.169977] ? __pfx_xfrm_tmpl_resolve_one+0x10/0x10
[ 64.169977] ? __pfx_stack_trace_consume_entry+0x10/0x10
[ 64.169977] ? kernel_text_address+0x5b/0x80
[ 64.169977] ? __kernel_text_address+0xe/0x30
[ 64.169977] ? unwind_get_return_address+0x5e/0x90
[ 64.169977] ? arch_stack_walk+0x8c/0xe0
[ 64.169977] xfrm_tmpl_resolve+0x130/0x200
[ 64.169977] ? __pfx_xfrm_tmpl_resolve+0x10/0x10
[ 64.169977] ? __pfx_xfrm_policy_inexact_lookup_rcu+0x10/0x10
[ 64.169977] ? __refcount_add_not_zero.constprop.0+0xb2/0x110
[ 64.169977] ? __pfx___refcount_add_not_zero.constprop.0+0x10/0x10
[ 64.169977] xfrm_resolve_and_create_bundle+0xd5/0x310
[ 64.169977] ? __pfx_xfrm_resolve_and_create_bundle+0x10/0x10
[ 64.169977] ? __pfx_xfrm_policy_lookup_bytype+0x10/0x10
[ 64.169977] ? __pfx_xfrm_policy_lookup_bytype+0x10/0x10
[ 64.169977] xfrm_lookup_with_ifid+0x3d8/0xb80
[ 64.169977] ? __pfx_xfrm_lookup_with_ifid+0x10/0x10
[ 64.169977] ? ip_route_output_key_hash+0xc6/0x110
[ 64.169977] ? kasan_save_track+0x10/0x30
[ 64.169977] xfrm_lookup_route+0x18/0xe0
[ 64.169977] ip4_datagram_release_cb+0x4c9/0x530
[ 64.169977] ? __pfx_ip4_datagram_release_cb+0x10/0x10
[ 64.169977] ? do_raw_spin_lock+0x71/0xc0
[ 64.169977] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 64.169977] release_sock+0xb0/0x170
[ 64.169977] udp_connect+0x43/0x50
[ 64.169977] __sys_connect+0xa6/0x100
[ 64.169977] ? alloc_fd+0x2e9/0x300
[ 64.169977] ? __pfx___sys_connect+0x10/0x10
[ 64.169977] ? preempt_latency
---truncated---
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: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xfrm模块未正确拒绝出站策略中的可选IPTFS模板，可能导致栈越界读取。
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-2026-68420 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-68420 补丁与修复 (2)
同批安全公告 · Linux · 2026-08-10 · 共 344 条
| CVE-2026-68302 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68388 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68161 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68385 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68381 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68160 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68123 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68300 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68127 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68117 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68159 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68158 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68136 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68426 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68170 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68144 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68156 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68154 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-68124 | 9.6 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 344 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-68420
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