CVE-2021-47040 io_uring: fix overflows checks in provide buffers

2024-02-2808:13:46

Linux

www.cve.org

linux kernel

overflow

sign extension

buffer

security fix

7.7 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.7%

JSON

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

io_uring: fix overflows checks in provide buffers

Colin reported before possible overflow and sign extension problems in
io_provide_buffers_prep(). As Linus pointed out previous attempt did nothing
useful, see d81269fecb8ce (“io_uring: fix provide_buffers sign extension”).

Do that with help of check_<op>_overflow helpers. And fix struct
io_provide_buf::len type, as it doesn’t make much sense to keep it
signed.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/io_uring.c"
    ],
    "versions": [
      {
        "version": "efe68c1ca8f4",
        "lessThan": "cbbc13b115b8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "efe68c1ca8f4",
        "lessThan": "51bf90901952",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "efe68c1ca8f4",
        "lessThan": "84b8c266c4bf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "efe68c1ca8f4",
        "lessThan": "38134ada0cee",
        "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/io_uring.c"
    ],
    "versions": [
      {
        "version": "5.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.8",
        "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"
      }
    ]
  }
]