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LinuxCVE-2021-4441

HistoryAug 22, 2024 - 2:15 a.m.

CVE-2021-4441

2024-08-2202:15:04

CWE-476

Linux

web.nvd.nist.gov

linux kernel

spi

zynq-qspi

CVSS3

5.5

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

AI Score

6.7

Confidence

Low

EPSS

Percentile

5.1%

JSON

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

spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()

In zynq_qspi_exec_mem_op(), kzalloc() is directly used in memset(),
which could lead to a NULL pointer dereference on failure of
kzalloc().

Fix this bug by adding a check of tmpbuf.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_SPI_ZYNQ_QSPI=m show no new warnings,
and our static analyzer no longer warns about this code.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange5.2–5.4.182

linuxlinux_kernelRange5.5–5.10.103

linuxlinux_kernelRange5.11–5.15.26

linuxlinux_kernelRange5.16–5.16.12

linuxlinux_kernelMatch5.17rc1

linuxlinux_kernelMatch5.17rc2

linuxlinux_kernelMatch5.17rc3

linuxlinux_kernelMatch5.17rc4

linuxlinux_kernelMatch5.17rc5

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel5.17cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
linuxlinux_kernel5.17cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
linuxlinux_kernel5.17cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
linuxlinux_kernel5.17cpe:2.3:o:linux:linux_kernel:5.17:rc4:*:*:*:*:*:*
linuxlinux_kernel5.17cpe:2.3:o:linux:linux_kernel:5.17:rc5:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	5.17	cpe:2.3:o:linux:linux_kernel:5.17:rc1::::::
linux	linux_kernel	5.17	cpe:2.3:o:linux:linux_kernel:5.17:rc2::::::
linux	linux_kernel	5.17	cpe:2.3:o:linux:linux_kernel:5.17:rc3::::::
linux	linux_kernel	5.17	cpe:2.3:o:linux:linux_kernel:5.17:rc4::::::
linux	linux_kernel	5.17	cpe:2.3:o:linux:linux_kernel:5.17:rc5::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/spi/spi-zynq-qspi.c"
    ],
    "versions": [
      {
        "version": "67dca5e580f1",
        "lessThan": "df14d2bed8e2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "67dca5e580f1",
        "lessThan": "2efece1368ae",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "67dca5e580f1",
        "lessThan": "3c32405d6474",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "67dca5e580f1",
        "lessThan": "b9dd08cbebe0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "67dca5e580f1",
        "lessThan": "ab3824427b84",
        "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/spi/spi-zynq-qspi.c"
    ],
    "versions": [
      {
        "version": "5.2",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.2",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.182",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.103",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.26",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16.12",
        "lessThanOrEqual": "5.16.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.17",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]