CVE-2026-74481— 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 5.7版本存在安全漏洞，该漏洞源于系统挂起期间页面报告工作使用全局system_wq且缺少WQ_FREEZABLE标志，导致在已删除的virtqueue上触发释放后重用，可能导致内核崩溃。
可能的 ATT&CK 技术 1 AI
T1499.003 · Application Exhaustion Flood影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 36e66c554b5c6a9d17a229faca7a61693527b0bd< a4c60046052777ca1dcc83fe3ece2a5136b301f1 |
affected |
36e66c554b5c6a9d17a229faca7a61693527b0bd< b2c094e98f8bb823b3ae475f7169fe2091c40c6d |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< 992f270fd808338fbae1f498a5e325e7e2e20368 |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< f978048326570047e8216e81a67f9c71ef2bb1b1 |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< 450f35f4d5a682a0796757e52295df58ddb63bc9 |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< b11907c905fa08eda925395f0724b7a409870f65 |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< faf439b5fa7b231120eac4f7a617e0bfd4f6f5c7 |
affected | ||
36e66c554b5c6a9d17a229faca7a61693527b0bd< 0b45f6927a14914ff685fe0e6f9d11232a1e03df |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74481 基础信息
漏洞信息
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Vulnerability Title
mm/page_reporting: use system_freezable_wq to fix UAF during suspend
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mm/page_reporting: use system_freezable_wq to fix UAF during suspend
During PM freeze (e.g. S3 suspend or S4 hibernation), device drivers like
virtio_balloon reset their underlying virtio devices and delete their
virtqueues via vdev->config->del_vqs().
However, page reporting work (page_reporting_process) was scheduled on the
global system_wq. Because system_wq lacks the WQ_FREEZABLE flag, the PM
freezer skips it, leaving page_reporting_process active during suspend.
If pages are freed into the buddy allocator while suspending (for example,
when core MM invokes the balloon shrinker during S4 hibernation image
saving), page reporting triggers virtballoon_free_page_report() on deleted
virtqueues, resulting in a Use-After-Free / General Protection Fault:
[ 196.795226] general protection fault, probably for non-canonical address 0xaa1436fe70dae6df: 0000 [#1] SMP NOPTI
[ 196.825967] Workqueue: events page_reporting_process
[ 196.831038] RIP: 0010:virtqueue_add_split+0x233/0x4c0 [virtio_ring]
[ 196.927073] virtballoon_free_page_report+0x3a/0xe0 [virtio_balloon]
[ 196.946943] page_reporting_process+0x370/0x4f0
Fix this by switching page reporting work to system_freezable_wq. This
ensures that the PM freezer pauses page_reporting_process before device
drivers destroy their reporting virtqueues. Because the reporting worker
is frozen, memory reclamation/freeing (e.g. via shrinker execution) can
safely return pages to MM during freeze without triggering unfrozen
reporting work on deleted virtqueues.
This aligns with the driver's existing design. The comment in
virtballoon_freeze() states:
/*
* The workqueue is already frozen by the PM core before this
* function is called.
*/
Testing:
I have verified these fixes using Google’s virtualization infrastructure
by running continuous suspend/resume iterations (40+ cycles) while
churning memory using stress-ng (`stress-ng --vm 4 --vm-bytes 60%
--timeout 1`) to constantly create free pages for the buddy allocator. We
also set the `page_reporting_order` parameter to 0 to make the page
reporting worker highly sensitive, forcing it to pick up any 4K free
pages. This confirmed that the UAF crashes are no longer reproducible.
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基金会开源的一个操作系统内核。 Linux kernel 5.7版本存在安全漏洞，该漏洞源于系统挂起期间页面报告工作使用全局system_wq且缺少WQ_FREEZABLE标志，导致在已删除的virtqueue上触发释放后重用，可能导致内核崩溃。
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
二、漏洞 CVE-2026-74481 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74481 补丁与修复 (8)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72041 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72477 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72209 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72208 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72299 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74434 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74433 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72473 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72472 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74545 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72322 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74481
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