CVE-2026-93118 (GCVE-0-2026-93118)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-10-19 09:05
VLAI
Title
usb: gadget: aspeed_udc: check endpoint DMA allocation
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: aspeed_udc: check endpoint DMA allocation ast_udc_probe() allocates a coherent DMA buffer used as the backing store for endpoint buffers. ast_udc_init_ep() derives per-endpoint buffer pointers from udc->ep0_buf, so a failed allocation is dereferenced during probe. Check the allocation before endpoint setup. The existing probe error path called ast_udc_remove(), which unregisters the gadget unconditionally and is not safe before usb_add_gadget_udc() succeeds. Add a local cleanup helper for probe failures so pre-registration failures only unwind the resources that were actually initialized. This was found by a local static analysis checker for unchecked allocator returns while scanning Linux 6.16. The change was checked by applying it to current mainline and by running checkpatch. I do not have access to Aspeed UDC hardware, so no runtime testing was performed.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < d7ae1a48e70e9c3451b7dc7bc3896c82884bc4df (git)
Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < 4aaad88f857498ed1294f061f0b25d27ae891c55 (git)
Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < 6182e708e2e1f55521c8a01d7535630ecc2d7df9 (git)
Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < ff6e88e29965bd06f640e59acdcf0bbf04a7f55c (git)
Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < 9e6f57107c1886052d4baaa047a2bc3d0e91be5d (git)
Affected: 055276c1320564b0192b3af323b8cc67f9b665e1 , < 97cee53a94be3bd4fd8fbed6071bd2f32dad1ab1 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: aspeed_udc: check endpoint DMA allocation\n\nast_udc_probe() allocates a coherent DMA buffer used as the backing store\nfor endpoint buffers. ast_udc_init_ep() derives per-endpoint buffer\npointers from udc-\u003eep0_buf, so a failed allocation is dereferenced during\nprobe.\n\nCheck the allocation before endpoint setup. The existing probe error path\ncalled ast_udc_remove(), which unregisters the gadget unconditionally and\nis not safe before usb_add_gadget_udc() succeeds. Add a local cleanup\nhelper for probe failures so pre-registration failures only unwind the\nresources that were actually initialized.\n\nThis was found by a local static analysis checker for unchecked allocator\nreturns while scanning Linux 6.16. The change was checked by applying it\nto current mainline and by running checkpatch. I do not have access to\nAspeed UDC hardware, so no runtime testing was performed."
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          }
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}



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