CVE-2026-74641— ALSA usx2y hwdep mmap偏移越界漏洞
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。
在 Linux 内核中，已解决以下漏洞： ALSA: usx2y：对 hwdep mmap 故障偏移量进行边界限制 函数 将引发故障的页面偏移量直接转换为内核地址，且未施加任何边界检查： 仅检查映射的长度，从未检查偏移量，而 是通过 分配的单页内存。对于字符设备， 返回 ，因此内存管理（mm）层也未施加上限。任何大于零的页面偏移量都会解析到对象结构（struct page）之外的页面，而该处理程序会以读写方式将其安装到调用者的地址空间中；且 VMA（虚拟内存区域）未标记为只读。 调用者通过单个 参数选择页面帧，并获
可能的 ATT&CK 技术 1 AI
T1055 · Process Injection影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ad6fedea65c6e90eda00d716c8bf20cdc437ed10 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 10a87401fb3148c388e55df0148295b3b137da07 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 34ab56ed854baa73a731cfd99af689f0b1bac444 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4208db2453e1ea71b8048a5b7802360cb29a53f1 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f613b4a2d87247b51a1b2b330f2e083a454125f2 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f75d6f61f0d9c5c1ea725104014e10d26d1e3a00 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 5bf5ccddf00b59f1e3ea7e65d76a5f5b5c21cc2e |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2ca1eea3cd17930daffe9e429a7c89232036ec24 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74641 基础信息
漏洞信息
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Vulnerability Title
ALSA: usx2y: bound the hwdep mmap fault offset
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ALSA: usx2y: bound the hwdep mmap fault offset
snd_us428ctls_vm_fault() turns the faulting page offset into a kernel
address with no bound of any kind:
offset = vmf->pgoff << PAGE_SHIFT;
vaddr = (char *)(...)->us428ctls_sharedmem + offset;
page = virt_to_page(vaddr);
get_page(page);
vmf->page = page;
return 0;
snd_us428ctls_mmap() checks only the length of the mapping, never the
offset, and us428ctls_sharedmem is a single page from
alloc_pages_exact(). For a character device file_mmap_size_max()
returns ULONG_MAX, so the mm layer imposes no ceiling either. Every page
offset above zero resolves to a struct page outside the object, and the
handler installs it into the caller's address space read-write; the vma
is not marked read-only.
The caller picks the page frame with a single mmap() argument and gets
read-write access to a page of kernel memory it does not own; an offset
that lands in an unpopulated vmemmap region oopses instead.
A process that can open the hwdep node of an attached US-X2Y reaches
this after loading the FPGA image through the same node; no capability
check is involved.
On 7.2.0-rc5 (arm64), mmap() with a large offset:
Unable to handle kernel paging request at virtual address fffffdffc45d5ac8
pc : snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y]
Call trace:
snd_us428ctls_vm_fault+0x68/0x140 [snd_usb_usx2y]
__do_fault
__handle_mm_fault
handle_mm_fault
el0_da
Reject any offset outside the shared region. The pcm hwdep handler in
usx2yhwdeppcm.c computes its address the same way and needs the same
bound.
Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>
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
受影响产品
二、漏洞 CVE-2026-74641 的公开POC
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|---|
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CVE-2026-74641 补丁与修复 (7)
同批安全公告 · Linux · 2026-08-22 · 共 150 条
| CVE-2026-74705 | 10.0 CRITICAL | UDP隧道分段潜在使用-after-free漏洞 |
| CVE-2026-74612 | 10.0 CRITICAL | Linux内核veth模块SKB长度计算漏洞 |
| CVE-2026-74587 | 9.8 CRITICAL | SCTP 缓存 ASCONF 块使用后释放漏洞 |
| CVE-2026-74591 | 9.8 CRITICAL | Linux 内核文件映射恢复索引前重试导致漏洞 |
| CVE-2026-74688 | 9.8 CRITICAL | SCTP传输控制块移除漏洞 |
| CVE-2026-74597 | 9.8 CRITICAL | Linux ip6_tunnel skb2->cb[]未清除漏洞 |
| CVE-2026-74617 | 9.8 CRITICAL | dibs: 在dibs_dev_alloc()中初始化dibs->lock |
| CVE-2026-74616 | 9.8 CRITICAL | Linux内核XDP克隆数据包越界漏洞 |
| CVE-2026-74628 | 9.8 CRITICAL | Linux内核 x25 远程计时器释放后使用漏洞 |
| CVE-2026-74608 | 9.8 CRITICAL | SMB客户端cifs_try_adding_channels函数中的释放后使用漏洞 |
| CVE-2026-74669 | 9.8 CRITICAL | Linux IPVS IPv4选项后重定位隧道ICMP错误 |
| CVE-2026-74662 | 9.8 CRITICAL | Linux inet frags 定时器竞争条件漏洞 |
| CVE-2026-74730 | 9.8 CRITICAL | NFS：在FREE_STATEID调用期间锁定struct nfs_server |
| CVE-2026-74727 | 9.8 CRITICAL | OpenVPN by_id移除后跳过哈希重构 |
| CVE-2026-74586 | 9.8 CRITICAL | Linux内核SCTP对等端移除时传输未清理漏洞 |
| CVE-2026-74723 | 9.8 CRITICAL | btrfs LZO拒绝无有效头部的内联扩展 |
| CVE-2026-74588 | 9.8 CRITICAL | Linux SCTP传输列表不同步漏洞 |
| CVE-2026-74611 | 9.8 CRITICAL | TLS 1.3 乐观重试消息迭代器恢复漏洞 |
| CVE-2026-74712 | 9.3 CRITICAL | mlx5 vdpa 在 create_direct_keys() 中缓冲区长度修复漏洞 |
| CVE-2026-74665 | 9.1 CRITICAL | NET skb长度计算通用XDP片段调整后修复 |
显示前 20 条，共 150 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74641
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