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

Received
AliasesUBUNTU-CVE-2026-74498DEBIAN-CVE-2026-74498
Published 15-08-2026Last modified 19-08-2026

Vulnerability summary

CVE-2026-74498 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · -0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 8
SUSE-SU-2026:4687-1SUSE-SU-2026:5091-1USN-8875-1USN-8875-2USN-8876-1USN-8877-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

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 ]

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.22% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8 | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < b1770f9ac35c0ffc34914d52347c65dcd5ac049b | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 3852974608f53e530e27c21d0c6c7d79c17b3f5a | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < f9b6c9576568169139ac151f7881474f384659fd | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 04595233e5606d452f9f47e6989fc7ae7440fd40 | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < bd65b7191683bebd9923904f0558b9211b9129da | ≥ 8fdff6a319e7dac757c558bd283dc4577e68cde7, < d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 | 3.5

3 vendors · 172 products

References

21 links
Show all 21 references