CVE-2023-52837 nbd: fix uaf in nbd_open

2024-05-2115:31:37

Linux

github.com

linux

kernel

nbd

vulnerability

fix

uaf

AI Score

6.8

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

nbd: fix uaf in nbd_open

Commit 4af5f2e03013 (“nbd: use blk_mq_alloc_disk and
blk_cleanup_disk”) cleans up disk by blk_cleanup_disk() and it won’t set
disk->private_data as NULL as before. UAF may be triggered in nbd_open()
if someone tries to open nbd device right after nbd_put() since nbd has
been free in nbd_dev_remove().

Fix this by implementing ->free_disk and free private data in it.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4af5f2e03013",
        "lessThan": "4e9b3ec84dc9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4af5f2e03013",
        "lessThan": "879947f4180b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4af5f2e03013",
        "lessThan": "56bd7901b5e9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4af5f2e03013",
        "lessThan": "327462725b0f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/block/nbd.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "6.1.63",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.5.12",
        "versionType": "custom",
        "lessThanOrEqual": "6.5.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.2",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/block/nbd.c"
    ],
    "defaultStatus": "affected"
  }
]