CVE-2024-42250 cachefiles: add missing lock protection when polling

2024-08-0715:14:33

Linux

www.cve.org

linux kernel

vulnerability

cachefiles

lock protection

polling

xarray

rcu

spinlock

EPSS

Percentile

5.0%

JSON

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

cachefiles: add missing lock protection when polling

Add missing lock protection in poll routine when iterating xarray,
otherwise:

Even with RCU read lock held, only the slot of the radix tree is
ensured to be pinned there, while the data structure (e.g. struct
cachefiles_req) stored in the slot has no such guarantee. The poll
routine will iterate the radix tree and dereference cachefiles_req
accordingly. Thus RCU read lock is not adequate in this case and
spinlock is needed here.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/cachefiles/daemon.c"
    ],
    "versions": [
      {
        "version": "0e19a18f998d",
        "lessThan": "97cfd5e20ddc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "189438643427",
        "lessThan": "6bb6bd3dd6f3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b817e22b2e91",
        "lessThan": "8eadcab7f3dd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "b817e22b2e91",
        "lessThan": "cf5bb09e742a",
        "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/cachefiles/daemon.c"
    ],
    "versions": [
      {
        "version": "6.8",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.8",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.10",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]