usb: ljca: bound bank_num in ljca_enumerate_gpio()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93119
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:06 UTC
Updated2026-10-19 10:17:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: ljca: bound bank_num in ljca_enumerate_gpio() ljca_enumerate_gpio() reads desc->bank_num from the device and loops valid_pin[i] = get_unaligned_le32(...) for i < bank_num. valid_pin[] holds only LJCA_MAX_GPIO_NUM / 32 = 2 entries. Two checks run before the loop. The reply length must match struct_size(desc, bank_desc, bank_num). The product pins_per_bank * bank_num must not exceed LJCA_MAX_GPIO_NUM. Neither one bounds bank_num against the size of valid_pin[]. The reply is capped at LJCA_MAX_PAYLOAD_SIZE (60) bytes, so the struct_size check limits bank_num to 9. A device that reports bank_num 9 with pins_per_bank 7 still passes both checks. gpio_num is 63 and the reply is 56 bytes. The loop then writes nine u32 into the two entry array and overruns valid_pin[] on the stack. A broken or malicious LJCA device can therefore overflow the stack. Reject a bank_num that does not fit valid_pin[].

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.102120000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected acd6199f195d6de814ac4090ce0864a613b1580e 0069593170a3d177de793c9a0b36989c4f069111 git Not specified
CNA Linux Linux affected acd6199f195d6de814ac4090ce0864a613b1580e aed958c4f784a29cf42abb3e54af51a16bddde46 git Not specified
CNA Linux Linux affected acd6199f195d6de814ac4090ce0864a613b1580e 9c4bc8f7426aa001387800bf0140bfc5087a6de3 git Not specified
CNA Linux Linux affected acd6199f195d6de814ac4090ce0864a613b1580e dd9483726d0f16c1a56879c3edb65128259a4e2b git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dd9483726d0f16c1a56879c3edb65128259a4e2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c4bc8f7426aa001387800bf0140bfc5087a6de3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aed958c4f784a29cf42abb3e54af51a16bddde46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0069593170a3d177de793c9a0b36989c4f069111 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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