CVE-2021-47225

2024-05-2115:15:11

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

mac80211

vulnerability

fixed

deadlock

vlan handling

syzbot

dev_close()

wiphy mutex

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

9.1%

JSON

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

mac80211: fix deadlock in AP/VLAN handling

Syzbot reports that when you have AP_VLAN interfaces that are up
and close the AP interface they belong to, we get a deadlock. No
surprise - since we dev_close() them with the wiphy mutex held,
which goes back into the netdev notifier in cfg80211 and tries to
acquire the wiphy mutex there.

To fix this, we need to do two things:

prevent changing iftype while AP_VLANs are up, we can’t
easily fix this case since cfg80211 already calls us with
the wiphy mutex held, but change_interface() is relatively
rare in drivers anyway, so changing iftype isn’t used much
(and userspace has to fall back to down/change/up anyway)
pull the dev_close() loop over VLANs out of the wiphy mutex
section in the normal stop case

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.12–5.12.13

linuxlinux_kernelRange5.13.0≥

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mac80211/iface.c"
    ],
    "versions": [
      {
        "version": "a05829a7222e",
        "lessThan": "8043903fcb72",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a05829a7222e",
        "lessThan": "d5befb224edb",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mac80211/iface.c"
    ],
    "versions": [
      {
        "version": "5.12",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.12",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.12.13",
        "lessThanOrEqual": "5.12.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.13",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]