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416baaa9-dc9f-4396-8d5f-8c081fb06d67CVE-2021-46945

HistoryFeb 27, 2024 - 7:04 p.m.

CVE-2021-46945

2024-02-2719:04:06

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

web.nvd.nist.gov

547

cve-2021-46945

linux kernel

ext4

vulnerability

security

nvd

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

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

ext4: always panic when errors=panic is specified

Before commit 014c9caa29d3 (“ext4: make ext4_abort() use
__ext4_error()”), the following series of commands would trigger a
panic:

mount /dev/sda -o ro,errors=panic test
mount /dev/sda -o remount,abort test

After commit 014c9caa29d3, remounting a file system using the test
mount option “abort” will no longer trigger a panic. This commit will
restore the behaviour immediately before commit 014c9caa29d3.
(However, note that the Linux kernel’s behavior has not been
consistent; some previous kernel versions, including 5.4 and 4.19
similarly did not panic after using the mount option “abort”.)

This also makes a change to long-standing behaviour; namely, the
following series commands will now cause a panic, when previously it
did not:

mount /dev/sda -o ro,errors=panic test
echo test > /sys/fs/ext4/sda/trigger_fs_error

However, this makes ext4’s behaviour much more consistent, so this is
a good thing.

Affected configurations

Vulners

NVD

Node

linuxlinux_kernelRange5.11–5.11.20

linuxlinux_kernelRange5.12.0–5.12.3

linuxlinux_kernelRange5.13.0≥

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:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_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": [
      "fs/ext4/super.c"
    ],
    "versions": [
      {
        "version": "014c9caa29d3",
        "lessThan": "64e1eebe2131",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "014c9caa29d3",
        "lessThan": "1e9ea8f46370",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "014c9caa29d3",
        "lessThan": "ac2f7ca51b09",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ext4/super.c"
    ],
    "versions": [
      {
        "version": "5.11",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.11",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.11.20",
        "lessThanOrEqual": "5.11.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.3",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]