CVE-2021-47016 m68k: mvme147,mvme16x: Don't wipe PCC timer config bits

2024-02-2922:31:13

Linux

github.com

linux kernel

m68k

mvme147

mvme16x

pcc timer

vulnerability

6.8 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.7%

JSON

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

m68k: mvme147,mvme16x: Don’t wipe PCC timer config bits

Don’t clear the timer 1 configuration bits when clearing the interrupt flag
and counter overflow. As Michael reported, “This results in no timer
interrupts being delivered after the first. Initialization then hangs
in calibrate_delay as the jiffies counter is not updated.”

On mvme16x, enable the timer after requesting the irq, consistent with
mvme147.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/m68k/include/asm/mvme147hw.h",
      "arch/m68k/mvme147/config.c",
      "arch/m68k/mvme16x/config.c"
    ],
    "versions": [
      {
        "version": "7529b90d051e",
        "lessThan": "f6a90818a320",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7529b90d051e",
        "lessThan": "1dfb26df15fc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7529b90d051e",
        "lessThan": "73fdeb612d25",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7529b90d051e",
        "lessThan": "5d3422516934",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7529b90d051e",
        "lessThan": "43262178c043",
        "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/m68k/include/asm/mvme147hw.h",
      "arch/m68k/mvme147/config.c",
      "arch/m68k/mvme16x/config.c"
    ],
    "versions": [
      {
        "version": "5.2",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.2",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.119",
        "lessThanOrEqual": "5.4.*",
        "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"
      }
    ]
  }
]