CVE-2023-52464 EDAC/thunderx: Fix possible out-of-bounds string access

2024-02-2314:46:24

Linux

github.com

linux kernel vulnerability

edac/thunderx

string access

out-of-bounds

strncat()

strlcat()

6.7 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

EDAC/thunderx: Fix possible out-of-bounds string access

Enabling -Wstringop-overflow globally exposes a warning for a common bug
in the usage of strncat():

drivers/edac/thunderx_edac.c: In function ‘thunderx_ocx_com_threaded_isr’:
drivers/edac/thunderx_edac.c:1136:17: error: ‘strncat’ specified bound 1024 equals destination size [-Werror=stringop-overflow=]
1136 | strncat(msg, other, OCX_MESSAGE_SIZE);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
…
1145 | strncat(msg, other, OCX_MESSAGE_SIZE);
…
1150 | strncat(msg, other, OCX_MESSAGE_SIZE);

…

Apparently the author of this driver expected strncat() to behave the
way that strlcat() does, which uses the size of the destination buffer
as its third argument rather than the length of the source buffer. The
result is that there is no check on the size of the allocated buffer.

Change it to strlcat().

[ bp: Trim compiler output, fixup commit message. ]

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "71c17ee02538",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "5da3b6e7196f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "6aa7865ba7ff",
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        "status": "affected",
        "version": "41003396f932",
        "lessThan": "700cf4bead80",
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        "version": "41003396f932",
        "lessThan": "9dbac9fdae6e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "e1c865112415",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "426fae93c01d",
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      },
      {
        "status": "affected",
        "version": "41003396f932",
        "lessThan": "475c58e1a471",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/edac/thunderx_edac.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.12",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.19.306",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.268",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.209",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.148",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.75",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.14",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.2",
        "versionType": "custom",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/edac/thunderx_edac.c"
    ],
    "defaultStatus": "affected"
  }
]