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cve416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2021-46904
HistoryFeb 26, 2024 - 4:27 p.m.

CVE-2021-46904

2024-02-2616:27:45
CWE-476
416baaa9-dc9f-4396-8d5f-8c081fb06d67
web.nvd.nist.gov
1145
linux kernel
net
hso
null-ptr-deref
vulnerability
fix
obtain_minor
release_minor
cve-2021-46904

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

6.2 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

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

net: hso: fix null-ptr-deref during tty device unregistration

Multiple ttys try to claim the same the minor number causing a double
unregistration of the same device. The first unregistration succeeds
but the next one results in a null-ptr-deref.

The get_free_serial_index() function returns an available minor number
but doesn’t assign it immediately. The assignment is done by the caller
later. But before this assignment, calls to get_free_serial_index()
would return the same minor number.

Fix this by modifying get_free_serial_index to assign the minor number
immediately after one is found to be and rename it to obtain_minor()
to better reflect what it does. Similary, rename set_serial_by_index()
to release_minor() and modify it to free up the minor number of the
given hso_serial. Every obtain_minor() should have corresponding
release_minor() call.

Affected configurations

Vulners
NVD
Node
linuxlinux_kernelRange2.6.274.4.268
OR
linuxlinux_kernelRange4.5.04.9.268
OR
linuxlinux_kernelRange4.10.04.14.232
OR
linuxlinux_kernelRange4.15.04.19.187
OR
linuxlinux_kernelRange4.20.05.4.112
OR
linuxlinux_kernelRange5.5.05.10.30
OR
linuxlinux_kernelRange5.11.05.11.14
OR
linuxlinux_kernelRange5.12.0
VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/usb/hso.c"
    ],
    "versions": [
      {
        "version": "72dc1c096c70",
        "lessThan": "a462067d7c8e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "145c89c441d2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "caf5ac93b3b5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "92028d7a31e5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "4a2933c88399",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "dc195928d7e4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "388d05f70f1e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "72dc1c096c70",
        "lessThan": "8a12f8836145",
        "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/net/usb/hso.c"
    ],
    "versions": [
      {
        "version": "2.6.27",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.27",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.4.268",
        "lessThanOrEqual": "4.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.9.268",
        "lessThanOrEqual": "4.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.232",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.187",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.112",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.30",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.11.14",
        "lessThanOrEqual": "5.11.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

6.2 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%