CVE-2024-26828 cifs: fix underflow in parse_server_interfaces()

2024-04-1709:43:52

Linux

github.com

cve vulnerability resolution

cifs fix

parse_server_interfaces

linux kernel

AI Score

7.1

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

cifs: fix underflow in parse_server_interfaces()

In this loop, we step through the buffer and after each item we check
if the size_left is greater than the minimum size we need. However,
the problem is that “bytes_left” is type ssize_t while sizeof() is type
size_t. That means that because of type promotion, the comparison is
done as an unsigned and if we have negative bytes left the loop
continues instead of ending.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fe856be475f7",
        "lessThan": "7190353835b4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fe856be475f7",
        "lessThan": "f7ff1c89fb6e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fe856be475f7",
        "lessThan": "df2af9fdbc4d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fe856be475f7",
        "lessThan": "cffe487026be",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/smb/client/smb2ops.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.18",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "6.1.79",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.18",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.6",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/smb/client/smb2ops.c"
    ],
    "defaultStatus": "affected"
  }
]