CVE-2024-26993 fs: sysfs: Fix reference leak in sysfs_break_active_protection()

2024-05-0105:28:02

Linux

www.cve.org

linux kernel

vulnerability

sysfs

reference leak

fix

cve-2024-26993

AI Score

7.5

Confidence

High

EPSS

Percentile

13.0%

JSON

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

fs: sysfs: Fix reference leak in sysfs_break_active_protection()

The sysfs_break_active_protection() routine has an obvious reference
leak in its error path. If the call to kernfs_find_and_get() fails then
kn will be NULL, so the companion sysfs_unbreak_active_protection()
routine won’t get called (and would only cause an access violation by
trying to dereference kn->parent if it was called). As a result, the
reference to kobj acquired at the start of the function will never be
released.

Fix the leak by adding an explicit kobject_put() call when kn is NULL.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/sysfs/file.c"
    ],
    "versions": [
      {
        "version": "2afc9166f79b",
        "lessThan": "f28bba37fe24",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "57baab0f376b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "84bd4c2ae9c3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "43f00210cb25",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "5d43e072285e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "ac107356aabc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "a4c99b57d43b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "2afc9166f79b",
        "lessThan": "a90bca2228c0",
        "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/sysfs/file.c"
    ],
    "versions": [
      {
        "version": "4.19",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.19",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.313",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.275",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.216",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.157",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.88",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.29",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.8",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]