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CVE-2026-93280: greybus: audio: bound the topology section sizes against the fetched size

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: greybus: audio: bound the topology section sizes against the fetched size gb_audio_gb_get_topology() fetches a topology blob of a module-supplied size, and gbaudio_tplg_parse_data() then walks it by adding the module-supplied size_dais, size_controls and size_widgets fields to form the control, widget and route section offsets. Those le32 sizes are never checked against the fetched blob, so a module reporting a small topology size but large section sizes makes the offsets point past the allocation, and parsing reads out of bounds. Reject a topology whose section sizes do not fit within the fetched size before it is parsed.

Affected products

• Linux kernel: 4.9 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/33d8c7b794d2a30637c9d3fcb478f1d3222bef1e
• https://git.kernel.org/stable/c/52daf9de692ebac813d110eb1e677dc0e1f4a5ab
• https://git.kernel.org/stable/c/6f764363b3173d805be11e59a8f23ecee2d420d5
• https://git.kernel.org/stable/c/ba86de9f7b0d7903d2df5ea2373e34d8ca3fc43e
• https://git.kernel.org/stable/c/c9191f2e2f35f1209eb2dc24b31129dd47b48c16
• https://git.kernel.org/stable/c/cfcc5a41a9664eb68023aae4cd0d485b256bd7c7
• https://git.kernel.org/stable/c/d0f6eaba60705bacd9bb4ce48eab50ef3f546777
• https://git.kernel.org/stable/c/dd5593aee0a0fb353e1164aff7b65e563fe1f232

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