CVE-2024-43854 block: initialize integrity buffer to zero before writing it to media

2024-08-1709:22:11

Linux

www.cve.org

linux kernel

vulnerability

resolved

block

integrity buffer

zero

writing

media

metadata

bio_integrity_prep

kmalloc

kernel memory

pi metadata

buffer

leaks

non-pi

__gfp_zero

allocations

writes

EPSS

Percentile

5.0%

JSON

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

block: initialize integrity buffer to zero before writing it to media

Metadata added by bio_integrity_prep is using plain kmalloc, which leads
to random kernel memory being written media. For PI metadata this is
limited to the app tag that isn’t used by kernel generated metadata,
but for non-PI metadata the entire buffer leaks kernel memory.

Fix this by adding the __GFP_ZERO flag to allocations for writes.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "block/bio-integrity.c"
    ],
    "versions": [
      {
        "version": "7ba1ba12eeef",
        "lessThan": "9f4af4cf08f9",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "129f95948a96",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "3fd11fe4f207",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "cf6b45ea7a8d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "d418313bd8f5",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "23a19655fb56",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "ebc0e91ba76d",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "7ba1ba12eeef",
        "lessThan": "899ee2c3829c",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "block/bio-integrity.c"
    ],
    "versions": [
      {
        "version": "2.6.27",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.27",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.322",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.284",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.226",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.165",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.103",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.44",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.3",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]