ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 5 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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 ]
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74498
- 2026-10-03 Alias added: GHSA-ppm8-hvcv-5jfx
- 2026-10-27 CVSS score changed · Red Hat
- 2026-11-06 CISA SSVC decision points changed
References
Other 8
- https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8
- https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b
- https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c
- https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a
- https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd
- https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40
- https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da
- https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5
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- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
Sources
- CVE-2026-74498 · CVE Program
- CVE-2026-74498 · NVD
- FIRST EPSS
- GHSA-ppm8-hvcv-5jfx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74498 · Red Hat security data · CC BY 4.0
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