Linux Kernel up to 7.2.5 aspeed_udc ast_udc_probe null pointer dereference

CVSS Meta Temp Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. This affects the function ast_udc_probe of the component aspeed_udc. Performing a manipulation results in null pointer dereference. This vulnerability was named CVE-2026-93118. The attack needs to be approached locally. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. It has been classified as problematic. This affects the function ast_udc_probe of the component aspeed_udc. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93118 since 09/17/2026. The exploitability is told to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch d7ae1a48e70e9c3451b7dc7bc3896c82884bc4df/4aaad88f857498ed1294f061f0b25d27ae891c55/6182e708e2e1f55521c8a01d7535630ecc2d7df9/ff6e88e29965bd06f640e59acdcf0bbf04a7f55c/9e6f57107c1886052d4baaa047a2bc3d0e91be5d/97cee53a94be3bd4fd8fbed6071bd2f32dad1ab1 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: d7ae1a48e70e9c3451b7dc7bc3896c82884bc4df/4aaad88f857498ed1294f061f0b25d27ae891c55/6182e708e2e1f55521c8a01d7535630ecc2d7df9/ff6e88e29965bd06f640e59acdcf0bbf04a7f55c/9e6f57107c1886052d4baaa047a2bc3d0e91be5d/97cee53a94be3bd4fd8fbed6071bd2f32dad1ab1

Timelineinfo

09/17/2026 CVE reserved
09/17/2026 +0 days VulDB entry created
09/18/2026 +0 days Advisory disclosed
09/18/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93118 (🔒)
GCVE (CVE): GCVE-0-2026-93118
GCVE (VulDB): GCVE-100-407283

Entryinfo

Created: 09/18/2026 00:16
Changes: 09/18/2026 00:16 (59)
Complete: 🔍
Cache ID: 216::103

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