CVE-2021-47263 gpio: wcd934x: Fix shift-out-of-bounds error

2024-05-2114:19:55

Linux

github.com

linux kernel

gpio

wcd934x

vulnerability

patch

shift-out-of-bounds

ubsan

cve-2021-47263

AI Score

6.8

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

In the Linux kernel, the following vulnerability has been resolved:

gpio: wcd934x: Fix shift-out-of-bounds error

bit-mask for pins 0 to 4 is BIT(0) to BIT(4) however we ended up with BIT(n - 1)
which is not right, and this was caught by below usban check

UBSAN: shift-out-of-bounds in drivers/gpio/gpio-wcd934x.c:34:14

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "59c324683400",
        "lessThan": "e0b518a2eb44",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59c324683400",
        "lessThan": "dd55331d493b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "59c324683400",
        "lessThan": "dbec64b11c65",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/gpio/gpio-wcd934x.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.44",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.12.11",
        "versionType": "custom",
        "lessThanOrEqual": "5.12.*"
      },
      {
        "status": "unaffected",
        "version": "5.13",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpio/gpio-wcd934x.c"
    ],
    "defaultStatus": "affected"
  }
]