CVE-2024-43890 tracing: Fix overflow in get_free_elt()

2024-08-2610:10:43

Linux

www.cve.org

linux kernel

vulnerability

tracing

overflow

fix

elements

maximum

preemption

cpu hang.

EPSS

Percentile

5.1%

JSON

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

tracing: Fix overflow in get_free_elt()

“tracing_map->next_elt” in get_free_elt() is at risk of overflowing.

Once it overflows, new elements can still be inserted into the tracing_map
even though the maximum number of elements (max_elts) has been reached.
Continuing to insert elements after the overflow could result in the
tracing_map containing “tracing_map->max_size” elements, leaving no empty
entries.
If any attempt is made to insert an element into a full tracing_map using
__tracing_map_insert(), it will cause an infinite loop with preemption
disabled, leading to a CPU hang problem.

Fix this by preventing any further increments to “tracing_map->next_elt”
once it reaches “tracing_map->max_elt”.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/trace/tracing_map.c"
    ],
    "versions": [
      {
        "version": "08d43a5fa063",
        "lessThan": "302ceb625d7b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "d3e4dbc2858f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "eb223bf01e68",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "cd10d186a540",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "788ea62499b3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "a172c7b22bc2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "236bb4690773",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "08d43a5fa063",
        "lessThan": "bcf86c01ca46",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/trace/tracing_map.c"
    ],
    "versions": [
      {
        "version": "4.7",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.7",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.320",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.282",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.224",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.165",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.105",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.46",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.5",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]