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416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2021-47541

HistoryMay 24, 2024 - 3:15 p.m.

CVE-2021-47541

2024-05-2415:15:18

CWE-416

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

cve-2021-47541

vulnerability resolved

static analyzer

inconsistent security operations

mlxx4_en_try_alloc_resources

mlx4_en_copy_priv

mlx4_en_alloc_resources

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

7 High

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()

In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and
tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv().
After that mlx4_en_alloc_resources() is called and there is a dereference
of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to
a use after free problem on failure of mlx4_en_copy_priv().

Fix this bug by adding a check of mlx4_en_copy_priv()

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_MLX4_EN=m show no new warnings,
and our static analyzer no longer warns about this code.

Affected configurations

Vulners

NVD

Node

linuxlinux_kernelRange4.7–4.14.257

linuxlinux_kernelRange4.15.0–4.19.220

linuxlinux_kernelRange4.20.0–5.4.164

linuxlinux_kernelRange5.5.0–5.10.84

linuxlinux_kernelRange5.11.0–5.15.7

linuxlinux_kernelRange5.16.0≥

CPENameOperatorVersion
linux:linux_kernellinux linux kernellt4.14.257
linux:linux_kernellinux linux kernellt4.19.220
linux:linux_kernellinux linux kernellt5.4.164
linux:linux_kernellinux linux kernellt5.10.84
linux:linux_kernellinux linux kernellt5.15.7

CPE	Name	Operator	Version
linux:linux_kernel	linux linux kernel	lt	4.14.257
linux:linux_kernel	linux linux kernel	lt	4.19.220
linux:linux_kernel	linux linux kernel	lt	5.4.164
linux:linux_kernel	linux linux kernel	lt	5.10.84
linux:linux_kernel	linux linux kernel	lt	5.15.7

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/mellanox/mlx4/en_netdev.c"
    ],
    "versions": [
      {
        "version": "ec25bc04ed8e",
        "lessThan": "be12572c5ddc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ec25bc04ed8e",
        "lessThan": "676dc7d9b15b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ec25bc04ed8e",
        "lessThan": "e461a9816a1a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ec25bc04ed8e",
        "lessThan": "f1d43efa59f1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ec25bc04ed8e",
        "lessThan": "75917372eef0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ec25bc04ed8e",
        "lessThan": "addad7643142",
        "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/ethernet/mellanox/mlx4/en_netdev.c"
    ],
    "versions": [
      {
        "version": "4.7",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.7",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.257",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.220",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.164",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.84",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.7",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]