CVE-2025-68810— 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，该漏洞源于允许在现有内存槽上清除KVM_MEM_GUEST_MEMFD标志，可能导致释放后重用。
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | a7800aa80ea4d5356b8474c2302812e9d4926fa6< 89dbbe6ff323fc34659621a577fe0af913f47386 |
affected |
a7800aa80ea4d5356b8474c2302812e9d4926fa6< cb51bef465d8ec60a968507330e01020e35dc127 |
affected | ||
a7800aa80ea4d5356b8474c2302812e9d4926fa6< 9935df5333aa503a18de5071f53762b65c783c4c |
affected | ||
6.8 |
affected | ||
< 6.8 |
unaffected | ||
6.12.64≤ 6.12.* |
unaffected | ||
6.18.3≤ 6.18.* |
unaffected | ||
6.19≤ * |
unaffected |
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一、 漏洞 CVE-2025-68810 基础信息
漏洞信息
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Vulnerability Title
KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot
Reject attempts to disable KVM_MEM_GUEST_MEMFD on a memslot that was
initially created with a guest_memfd binding, as KVM doesn't support
toggling KVM_MEM_GUEST_MEMFD on existing memslots. KVM prevents enabling
KVM_MEM_GUEST_MEMFD, but doesn't prevent clearing the flag.
Failure to reject the new memslot results in a use-after-free due to KVM
not unbinding from the guest_memfd instance. Unbinding on a FLAGS_ONLY
change is easy enough, and can/will be done as a hardening measure (in
anticipation of KVM supporting dirty logging on guest_memfd at some point),
but fixing the use-after-free would only address the immediate symptom.
==================================================================
BUG: KASAN: slab-use-after-free in kvm_gmem_release+0x362/0x400 [kvm]
Write of size 8 at addr ffff8881111ae908 by task repro/745
CPU: 7 UID: 1000 PID: 745 Comm: repro Not tainted 6.18.0-rc6-115d5de2eef3-next-kasan #3 NONE
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
Call Trace:
<TASK>
dump_stack_lvl+0x51/0x60
print_report+0xcb/0x5c0
kasan_report+0xb4/0xe0
kvm_gmem_release+0x362/0x400 [kvm]
__fput+0x2fa/0x9d0
task_work_run+0x12c/0x200
do_exit+0x6ae/0x2100
do_group_exit+0xa8/0x230
__x64_sys_exit_group+0x3a/0x50
x64_sys_call+0x737/0x740
do_syscall_64+0x5b/0x900
entry_SYSCALL_64_after_hwframe+0x4b/0x53
RIP: 0033:0x7f581f2eac31
</TASK>
Allocated by task 745 on cpu 6 at 9.746971s:
kasan_save_stack+0x20/0x40
kasan_save_track+0x13/0x50
__kasan_kmalloc+0x77/0x90
kvm_set_memory_region.part.0+0x652/0x1110 [kvm]
kvm_vm_ioctl+0x14b0/0x3290 [kvm]
__x64_sys_ioctl+0x129/0x1a0
do_syscall_64+0x5b/0x900
entry_SYSCALL_64_after_hwframe+0x4b/0x53
Freed by task 745 on cpu 6 at 9.747467s:
kasan_save_stack+0x20/0x40
kasan_save_track+0x13/0x50
__kasan_save_free_info+0x37/0x50
__kasan_slab_free+0x3b/0x60
kfree+0xf5/0x440
kvm_set_memslot+0x3c2/0x1160 [kvm]
kvm_set_memory_region.part.0+0x86a/0x1110 [kvm]
kvm_vm_ioctl+0x14b0/0x3290 [kvm]
__x64_sys_ioctl+0x129/0x1a0
do_syscall_64+0x5b/0x900
entry_SYSCALL_64_after_hwframe+0x4b/0x53
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，该漏洞源于允许在现有内存槽上清除KVM_MEM_GUEST_MEMFD标志，可能导致释放后重用。
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-2025-68810 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2026-01-13 · 共 93 条
| CVE-2025-71068 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68794 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68811 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68817 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68775 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68809 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-71093 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-71095 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68818 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71072 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68799 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68803 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71078 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68801 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71082 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68795 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68793 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68822 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68792 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71066 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 93 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-68810
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