CVE-2026-89956— Linux 3.10 s390/vfio-ap 并发访问漏洞
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。
以下是该漏洞描述的中文翻译： 在 Linux 内核中，以下漏洞已得到修复： s390/vfio-ap：修复访问 ap_matrix_mdev 对象列表时缺失的锁 为了遍历或在 中添加/移除 对象，必须持有 互斥锁。然而，有两个函数在访问该列表时并未持有此互斥锁： vfio_ap_mdev_probe 函数 函数使用 互斥锁来保护新创建的 对象添加到 的过程。但该互斥锁并不保护列表本身的访问；它的目的是防止对 对象内部字段的并发访问。如果在并发地创建或移除另一个 mdev 时未正确加锁，可能会导致内核内存损坏或释放后
可能的 ATT&CK 技术 1 AI
T1069 · Permission Groups Discovery影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 2c1ee8983aa377fef4f725162f4f3aa5f9575d4a< 530ee1cc71562b6799b9ece187b6c1b757a2c6fa |
affected |
2c1ee8983aa377fef4f725162f4f3aa5f9575d4a< 647916988272fe5ecb4bb30cd02b51af9960618a |
affected | ||
2c1ee8983aa377fef4f725162f4f3aa5f9575d4a< 0fd74477d05743d4cd9b25a3b667daa278d53b93 |
affected | ||
2c1ee8983aa377fef4f725162f4f3aa5f9575d4a< 7fa61c29850d05e40ca9ed41bfdf57673023f581 |
affected | ||
6.0 |
affected | ||
< 6.0 |
unaffected | ||
6.12.112≤ 6.12.* |
unaffected | ||
6.18.51≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-89956 基础信息
漏洞信息
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Vulnerability Title
s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
s390/vfio-ap: Fix missing lock required to access list of ap_matrix_mdev objects
In order to traverse or add/remove ap_matrix_mdev objects in the
matrix_dev->mdev_list, the matrix_dev->guests_lock mutex must be held.
There are two functions that access the list without holding the mutex:
vfio_ap_mdev_probe function
~~~~~~~~~~~~~~~~~~~~~~~~~~~
The vfio_ap_mdev_probe function uses the matrix_dev->mdevs_lock
mutex to guard the add of a newly created ap_matrix_mdev object to the
matrix_dev->mdev_list. This mutex does not protect list access; its purpose
is to guard against concurrent access to fields contained in an
ap_matrix_mdev object. This could lead to kernel memory corruption or
use-after-free if another mdev is created or removed concurrently.
The adding of an ap_matrix_mdev object to matrix_dev->mdev_list
is now guarded by the matrix_dev->guests_lock which is the correct
way to protect against concurrent mdev_list access.
Also removed the following two lines of code because the matrix_mdev is
allocated via vfio_alloc_device macro which uses kzalloc, so req_trigger
and cfg_chg_trigger are already zero-initialised when the struct is
allocated before the call to vfio_register_emulated_iommu_dev. This
prevents a window whereby these triggers are set to NULL after
the device is exposed to userspace.
matrix_mdev->req_trigger = NULL;
matrix_mdev->cfg_chg_trigger = NULL;
vfio_ap_mdev_for_queue function
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The status_show function that supports display of the status attribute of
the devices in /sys/bus/ap/devices calls the vfio_ap_mdev_for_queue
function which iterates the matrix_dev->mdev_list to find the object
representing the queue device whose status is to be displayed. In order to
traverse this list, the matrix_dev->guests_lock mutex must be held.
To fix this, the guests_lock mutex is taken prior to taking the
matrix_dev->mdevs_lock mutex in the status_show function. It is taken
there rather than the vfio_ap_mdev_for_queue function - where it is
needed - because it must be taken prior to the mdevs_lock mutex in order to
adhere to the proper locking order and prevent a lockdep splat; also
because the mdevs_lock is needed there to access fields within
the matrix_mdev object in that function.
See the vfio-ap-locking.rst in the linux kernel tree.
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
受影响产品
二、漏洞 CVE-2026-89956 的公开POC
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|---|
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CVE-2026-89956 补丁与修复 (1)
CVE-2026-89956 其他参考 (3)
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| CVE-2026-89916 | 9.3 CRITICAL | KVM arm64 VNCR失效重试漏洞 |
| CVE-2026-89930 | 9.3 CRITICAL | KVM嵌套虚拟化本地TLB刷新漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-89956
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