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CVE-2026-74498— ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set

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.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于设置fill_max标志时DMA缓冲区大小分配不当，可能导致越界写入并破坏内核堆内存。

AI Predicted 8.1 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8fdff6a319e7dac757c558bd283dc4577e68cde7< 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8 affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< b1770f9ac35c0ffc34914d52347c65dcd5ac049b affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< 3852974608f53e530e27c21d0c6c7d79c17b3f5a affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< f9b6c9576568169139ac151f7881474f384659fd affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< 04595233e5606d452f9f47e6989fc7ae7440fd40 affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< bd65b7191683bebd9923904f0558b9211b9129da affected
8fdff6a319e7dac757c558bd283dc4577e68cde7< d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 affected
… +10 more rows
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I. Basic Information for CVE-2026-74498

Vulnerability Information
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Vulnerability Title
ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value. Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory. Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size. [ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于设置fill_max标志时DMA缓冲区大小分配不当，可能导致越界写入并破坏内核堆内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8fdff6a319e7dac757c558bd283dc4577e68cde7 ~ 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8 -
Linux Linux 3.5 -

II. Public POCs for CVE-2026-74498

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III. Intelligence Information for CVE-2026-74498

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Patches & Fixes for CVE-2026-74498 (8)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72319 9.8 CRITICAL ipvs: ensure inner headers in ICMP errors are in headroom
CVE-2026-72220 9.8 CRITICAL sunrpc: harden rq_procinfo lifecycle to prevent double-free
CVE-2026-72217 9.8 CRITICAL SUNRPC: Bound-check xdr_buf_to_bvec() stores before writing
CVE-2026-74384 9.8 CRITICAL nvme-multipath: fix flex array size in struct nvme_ns_head
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72317 9.8 CRITICAL SUNRPC: pin upper rpc_clnt across the TLS connect_worker
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-74268 9.8 CRITICAL tcp: clear sock_ops cb flags before force-closing a child socket
CVE-2026-72207 9.8 CRITICAL ntfs: not change 0-byte $DATA attribute to non-resident
CVE-2026-74267 9.8 CRITICAL net/sched: sch_codel: Do not call qdisc_tree_reduce_backlog during peek before restoring q

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74498

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