CVE-2023-53821— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ip6_vti设备在发送IPv6包时可能触发释放后重用。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f855691975bb06373a98711e4cfe2c224244b536< 0f0ab8d52ee0062b28367dea23c29e254a26d7db |
affected |
f855691975bb06373a98711e4cfe2c224244b536< fa6c6c04f6c9b21b315023f487e5a07ae7fcf647 |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< eb47e612e59c358c3968a92f90dd36c78c9a2106 |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< ec23b25e5687dbd644c0f57bcb6af22dd5a6dd36 |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< a1639a82ce14af76b6419778d343ccbff86ee626 |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< 55ad2309205cc00c585344374c7472420e1b2c12 |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< c070688bfbe7759e61e697e421b2a331b0dd74bc |
affected | ||
f855691975bb06373a98711e4cfe2c224244b536< 9fd41f1ba638938c9a1195d09bc6fa3be2712f25 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2023-53821 基础信息
漏洞信息
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Vulnerability Title
ip6_vti: fix slab-use-after-free in decode_session6
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ip6_vti: fix slab-use-after-free in decode_session6
When ipv6_vti device is set to the qdisc of the sfb type, the cb field
of the sent skb may be modified during enqueuing. Then,
slab-use-after-free may occur when ipv6_vti device sends IPv6 packets.
The stack information is as follows:
BUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890
Read of size 1 at addr ffff88802e08edc2 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.0-next-20230707-00001-g84e2cad7f979 #410
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014
Call Trace:
<IRQ>
dump_stack_lvl+0xd9/0x150
print_address_description.constprop.0+0x2c/0x3c0
kasan_report+0x11d/0x130
decode_session6+0x103f/0x1890
__xfrm_decode_session+0x54/0xb0
vti6_tnl_xmit+0x3e6/0x1ee0
dev_hard_start_xmit+0x187/0x700
sch_direct_xmit+0x1a3/0xc30
__qdisc_run+0x510/0x17a0
__dev_queue_xmit+0x2215/0x3b10
neigh_connected_output+0x3c2/0x550
ip6_finish_output2+0x55a/0x1550
ip6_finish_output+0x6b9/0x1270
ip6_output+0x1f1/0x540
ndisc_send_skb+0xa63/0x1890
ndisc_send_rs+0x132/0x6f0
addrconf_rs_timer+0x3f1/0x870
call_timer_fn+0x1a0/0x580
expire_timers+0x29b/0x4b0
run_timer_softirq+0x326/0x910
__do_softirq+0x1d4/0x905
irq_exit_rcu+0xb7/0x120
sysvec_apic_timer_interrupt+0x97/0xc0
</IRQ>
Allocated by task 9176:
kasan_save_stack+0x22/0x40
kasan_set_track+0x25/0x30
__kasan_slab_alloc+0x7f/0x90
kmem_cache_alloc_node+0x1cd/0x410
kmalloc_reserve+0x165/0x270
__alloc_skb+0x129/0x330
netlink_sendmsg+0x9b1/0xe30
sock_sendmsg+0xde/0x190
____sys_sendmsg+0x739/0x920
___sys_sendmsg+0x110/0x1b0
__sys_sendmsg+0xf7/0x1c0
do_syscall_64+0x39/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 9176:
kasan_save_stack+0x22/0x40
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2b/0x40
____kasan_slab_free+0x160/0x1c0
slab_free_freelist_hook+0x11b/0x220
kmem_cache_free+0xf0/0x490
skb_free_head+0x17f/0x1b0
skb_release_data+0x59c/0x850
consume_skb+0xd2/0x170
netlink_unicast+0x54f/0x7f0
netlink_sendmsg+0x926/0xe30
sock_sendmsg+0xde/0x190
____sys_sendmsg+0x739/0x920
___sys_sendmsg+0x110/0x1b0
__sys_sendmsg+0xf7/0x1c0
do_syscall_64+0x39/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff88802e08ed00
which belongs to the cache skbuff_small_head of size 640
The buggy address is located 194 bytes inside of
freed 640-byte region [ffff88802e08ed00, ffff88802e08ef80)
As commit f855691975bb ("xfrm6: Fix the nexthdr offset in
_decode_session6.") showed, xfrm_decode_session was originally intended
only for the receive path. IP6CB(skb)->nhoff is not set during
transmission. Therefore, set the cb field in the skb to 0 before
sending packets.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ip6_vti设备在发送IPv6包时可能触发释放后重用。
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-2023-53821 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
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同批安全公告 · Linux · 2025-12-09 · 共 152 条
| CVE-2025-40343 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53794 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2022-50666 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2023-53827 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53785 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53822 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40336 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40342 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40328 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53851 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40337 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2022-50656 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53803 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53804 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53819 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53816 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53800 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53790 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53795 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-53810 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 152 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2023-53821
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