CVE-2024-46691 usb: typec: ucsi: Move unregister out of atomic section

2024-09-1305:29:20

Linux

www.cve.org

linux

kernel

usb

vulnerability

EPSS

Percentile

9.6%

JSON

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

usb: typec: ucsi: Move unregister out of atomic section

Commit ‘9329933699b3 (“soc: qcom: pmic_glink: Make client-lock
non-sleeping”)’ moved the pmic_glink client list under a spinlock, as it
is accessed by the rpmsg/glink callback, which in turn is invoked from
IRQ context.

This means that ucsi_unregister() is now called from atomic context,
which isn’t feasible as it’s expecting a sleepable context. An effort is
under way to get GLINK to invoke its callbacks in a sleepable context,
but until then lets schedule the unregistration.

A side effect of this is that ucsi_unregister() can now happen
after the remote processor, and thereby the communication link with it, is
gone. pmic_glink_send() is amended with a check to avoid the resulting NULL
pointer dereference.
This does however result in the user being informed about this error by
the following entry in the kernel log:

ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI write request: -5

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/soc/qcom/pmic_glink.c",
      "drivers/usb/typec/ucsi/ucsi_glink.c"
    ],
    "versions": [
      {
        "version": "9329933699b3",
        "lessThan": "095b0001aefd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9329933699b3",
        "lessThan": "11bb2ffb6793",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/soc/qcom/pmic_glink.c",
      "drivers/usb/typec/ucsi/ucsi_glink.c"
    ],
    "versions": [
      {
        "version": "6.10",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.10",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.8",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]