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LinuxCVE-2021-47179

HistoryMar 25, 2024 - 10:15 a.m.

CVE-2021-47179

2024-03-2510:15:09

CWE-476

Linux

web.nvd.nist.gov

linux kernel

nfsv4

null pointer

dereference

vulnerability

ontap

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

6.3

Confidence

Low

EPSS

Percentile

5.1%

JSON

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

NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()

Commit de144ff4234f changes _pnfs_return_layout() to call
pnfs_mark_matching_lsegs_return() passing NULL as the struct
pnfs_layout_range argument. Unfortunately,
pnfs_mark_matching_lsegs_return() doesn’t check if we have a value here
before dereferencing it, causing an oops.

I’m able to hit this crash consistently when running connectathon basic
tests on NFS v4.1/v4.2 against Ontap.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange4.9.269–4.9.271

linuxlinux_kernelRange4.14.233–4.14.235

linuxlinux_kernelRange4.19.191–4.19.193

linuxlinux_kernelRange5.4.118–5.4.124

linuxlinux_kernelRange5.10.36–5.10.42

linuxlinux_kernelRange5.12.3–5.12.9

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
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/nfs/pnfs.c"
    ],
    "versions": [
      {
        "version": "80e34f4957ec",
        "lessThan": "4e1ba532dbc1",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7b7b97746432",
        "lessThan": "42637ca25c7d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9ffa7967f937",
        "lessThan": "39785761fead",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6be0e4b59314",
        "lessThan": "aba3c7795f51",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2fafe7d5047f",
        "lessThan": "f9890652185b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7e65ea887d0c",
        "lessThan": "b090d110e666",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "de144ff4234f",
        "lessThan": "a421d218603f",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/nfs/pnfs.c"
    ],
    "versions": [
      {
        "version": "4.9.269",
        "lessThan": "4.9.271",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "4.14.233",
        "lessThan": "4.14.235",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "4.19.191",
        "lessThan": "4.19.193",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.4.118",
        "lessThan": "5.4.124",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.10.36",
        "lessThan": "5.10.42",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "5.12.3",
        "lessThan": "5.12.9",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]