CVE-2021-47018

2024-02-2809:15:39

Linux

web.nvd.nist.gov

linux kernel

cve-2021-47018

powerpc/64

fixmap area

vulnerability

nvd

security fix

AI Score

6.6

Confidence

Low

EPSS

Percentile

15.5%

JSON

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

powerpc/64: Fix the definition of the fixmap area

At the time being, the fixmap area is defined at the top of
the address space or just below KASAN.

This definition is not valid for PPC64.

For PPC64, use the top of the I/O space.

Because of circular dependencies, it is not possible to include
asm/fixmap.h in asm/book3s/64/pgtable.h , so define a fixed size
AREA at the top of the I/O space for fixmap and ensure during
build that the size is big enough.

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.5–5.10.37

linuxlinux_kernelRange5.11.0–5.11.21

linuxlinux_kernelRange5.12.0–5.12.4

linuxlinux_kernelRange5.13.0≥

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": [
      "arch/powerpc/include/asm/book3s/64/pgtable.h",
      "arch/powerpc/include/asm/fixmap.h",
      "arch/powerpc/include/asm/nohash/64/pgtable.h"
    ],
    "versions": [
      {
        "version": "265c3491c4bc",
        "lessThan": "4b9fb2c9039a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "265c3491c4bc",
        "lessThan": "abb07dc5e8b6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "265c3491c4bc",
        "lessThan": "a84df7c80bda",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "265c3491c4bc",
        "lessThan": "9ccba66d4d2a",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/powerpc/include/asm/book3s/64/pgtable.h",
      "arch/powerpc/include/asm/fixmap.h",
      "arch/powerpc/include/asm/nohash/64/pgtable.h"
    ],
    "versions": [
      {
        "version": "5.5",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.5",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.37",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.11.21",
        "lessThanOrEqual": "5.11.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.4",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]