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CVE-2026-97931— ALSA: us122l: Prevent write upgrades for read mappings

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： ALSA: us122l：阻止对只读映射进行写权限升级 hwdep 的 mmap 回调函数会拒绝初始状态下为可写的只读缓冲区映射，但对于使用 创建的映射，它会保留 标志。因此，能够以 方式打开 hwdep 节点的用户进程，随后可以通过 将该映射修改为可写。 读分配操作始于 结构体。其 成员由页错误处理程序（fault handler）用于判断哪些页属于读缓冲区。读虚拟内存区域（VMA）被有意设计为可扩展，因为 在读取该大小后会调用 。因此，如果先更改 ，可能会导致映射并访问

CVSS 7.0 · High EPSS 0.14% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 030a07e441296c372f946cd4065b5d831d8dc40c< cbc1f954ce67d739d41d1f0757d29850353ebb6a affected
030a07e441296c372f946cd4065b5d831d8dc40c< becb89036a1320ef0a77da2d27935ac0704345c4 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 6a5f5a5a32c78e67701f1d0f26bc87af68895604 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 938e8d6cee8d36f24669dfdcd3717e081eb32d64 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 64a87950239867682cde128020e1a47088295e5c affected
030a07e441296c372f946cd4065b5d831d8dc40c< d9c537b14f4982f17b103e3a2cfeee4bee6bc026 affected
030a07e441296c372f946cd4065b5d831d8dc40c< 0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f affected
030a07e441296c372f946cd4065b5d831d8dc40c< 71c610aeb1770302ac9c9e0b9a4ecd37f1311928 affected
… +10 more rows
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I. Basic Information for CVE-2026-97931

Vulnerability Information
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Vulnerability Title
ALSA: us122l: Prevent write upgrades for read mappings
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Prevent write upgrades for read mappings The hwdep mmap callback rejects read-buffer mappings that are initially writable, but leaves VM_MAYWRITE set on mappings created with PROT_READ. A process that can open the hwdep node O_RDWR can later use mprotect() to make the mapping writable. The read allocation begins with struct usb_stream. Its read_size member is used by the fault handler to decide which pages belong to the read buffer. The read VMA intentionally remains expandable because pcm_usb_stream uses mremap() after reading that size. Changing read_size first can therefore map and access pages beyond the allocation. The same member is also consumed by usb_stream_free(), where changing it can make free_pages_exact() release pages outside the allocation. Clear VM_MAYWRITE for read-buffer mappings after rejecting an initially writable VMA. This keeps the separate output-buffer mapping writable while preventing later permission upgrades.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 030a07e441296c372f946cd4065b5d831d8dc40c ~ cbc1f954ce67d739d41d1f0757d29850353ebb6a -
Linux Linux 2.6.28 -

II. Public POCs for CVE-2026-97931

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III. Intelligence Information for CVE-2026-97931

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Patches & Fixes for CVE-2026-97931 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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