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CVE-2026-74498

UnknownEPSS 0.17%

Last modified

CVE-2026-74498 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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 ]

Metrics

EPSS Probability
0.17%

6.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < b1770f9ac35c0ffc34914d52347c65dcd5ac049b; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 3852974608f53e530e27c21d0c6c7d79c17b3f5a; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < f9b6c9576568169139ac151f7881474f384659fd; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < 04595233e5606d452f9f47e6989fc7ae7440fd40; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < bd65b7191683bebd9923904f0558b9211b9129da; >= 8fdff6a319e7dac757c558bd283dc4577e68cde7, < d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5
LinuxLinux3.5

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74498?
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 ]
How severe is CVE-2026-74498?
Severity scoring for CVE-2026-74498 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74498?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST