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CVE-2026-98086— ALSA: ump: do not touch legacy_rmidi before it exists

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: ump：在 legacy_rmidi 未创建前，切勿对其进行访问 函数在每次退出时（包括发生错误时）都会设置 标志，但此时调用方尚未附加传统的 rawmidi 设备。随后， 会将 标志误解为“legacy_rmidi 已激活”，从而调用 函数。该函数内部会通过 向 写入数据。如果在此窗口期内（即从 引发的中断请求路径中）接收到一个 UMP 数据包，则 仍为 NULL，从而导致在 中发生空指针解引用（KASAN 检测到空指针解引用）。 对 legacy 辅助函数添

AI Predicted 6.5 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 37e0e14128e0685267dc5c037bf655421a6ce2ea< d6f9af093dc91dac8848a01e417b8109c651c0b2 affected
37e0e14128e0685267dc5c037bf655421a6ce2ea< 1c8e01792adf91879322f1ad752f1814de8b7e7d affected
37e0e14128e0685267dc5c037bf655421a6ce2ea< 228075f31b141395233218712242913125ace4e0 affected
37e0e14128e0685267dc5c037bf655421a6ce2ea< a4cef20cd473e0640fefd38094d4baac0ec76ae3 affected
37e0e14128e0685267dc5c037bf655421a6ce2ea< adeee7187694719890aaffdc14b7e89cfd736f1d affected
6.5 affected
< 6.5 unaffected
6.6.158≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-98086

Vulnerability Information
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Vulnerability Title
ALSA: ump: do not touch legacy_rmidi before it exists
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: ump: do not touch legacy_rmidi before it exists snd_ump_parse_endpoint() sets ump->parsed on every exit, including error, before the caller attaches the legacy rawmidi device. ump_handle_ep_name_msg() then treats parsed as "legacy_rmidi is live" and calls ump_legacy_set_rawmidi_name(), which snprintf()s into ump->legacy_rmidi->name. If a UMP packet arrives in that window (IRQ path from snd_ump_receive), legacy_rmidi is still NULL (KASAN null-ptr-deref in snprintf). Guard the legacy helpers. parsed only means endpoint info was parsed, not that legacy_rmidi exists.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 37e0e14128e0685267dc5c037bf655421a6ce2ea ~ d6f9af093dc91dac8848a01e417b8109c651c0b2 -
Linux Linux 6.5 -

II. Public POCs for CVE-2026-98086

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III. Intelligence Information for CVE-2026-98086

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Patches & Fixes for CVE-2026-98086 (5)

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-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
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-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
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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