CVE-2021-47194: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type
First published: Wed Apr 10 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type If the userspace tools switch from NL80211_IFTYPE_P2P_GO to NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it does not call the cleanup cfg80211_stop_ap(), this leads to the initialization of in-use data. For example, this path re-init the sdata->assigned_chanctx_list while it is still an element of assigned_vifs list, and makes that linked list corrupt.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=3.6.0<4.4.293 | |
| Linux Kernel | >=4.5.0<4.9.291 | |
| Linux Kernel | >=4.10.0<4.14.256 | |
| Linux Kernel | >=4.15.0<4.19.218 | |
| Linux Kernel | >=4.20.0<5.4.162 | |
| Linux Kernel | >=5.5.0<5.10.82 | |
| Linux Kernel | >=5.11.0<5.15.5 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/0738cdb636c21ab552eaecf905efa4a6070e3ebc
- https://git.kernel.org/stable/c/4e458abbb4a523f1413bfe15c079cf4e24c15b21
- https://git.kernel.org/stable/c/52affc201fc22a1ab9a59ef0ed641a9adfcb8d13
- https://git.kernel.org/stable/c/563fbefed46ae4c1f70cffb8eb54c02df480b2c2
- https://git.kernel.org/stable/c/5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd
- https://git.kernel.org/stable/c/7b97b5776daa0b39dbdadfea176f9cc0646d4a66
- https://git.kernel.org/stable/c/8f06bb8c216bcd172394f61e557727e691b4cb24
- https://git.kernel.org/stable/c/b8a045e2a9b234cfbc06cf36923886164358ddec
- https://launchpad.net/bugs/cve/CVE-2021-47194
- https://git.kernel.org/linus/563fbefed46ae4c1f70cffb8eb54c02df480b2c2
- https://security-tracker.debian.org/tracker/CVE-2021-47194
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47194
- https://nvd.nist.gov/vuln/detail/CVE-2021-47194
- https://ubuntu.com/security/CVE-2021-47194
Frequently Asked Questions
What is the severity of CVE-2021-47194?
CVE-2021-47194 has a medium severity rating due to its potential impact on network configuration in vulnerable Linux kernel versions.
How do I fix CVE-2021-47194?
To fix CVE-2021-47194, update the Linux kernel to version 5.10.223-1 or later.
What versions of the Linux kernel are affected by CVE-2021-47194?
CVE-2021-47194 affects Linux kernel versions between 3.6.0 and 5.15.5.
What is the nature of the vulnerability described in CVE-2021-47194?
CVE-2021-47194 is related to a failure in cleaning up network configurations when switching interface types.
Which Linux distributions should be concerned about CVE-2021-47194?
Linux distributions using affected versions of the Linux kernel should monitor CVE-2021-47194 and apply necessary updates.
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