Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for fragmentation we need to copy the PN to the RX struct so we can later use it to do a comparison, since commit bf30ca922a0c ("mac80211: check defrag PN against current frame"). Unfortunately, in that commit I used the 'hdr' variable without it being necessarily valid, so use-after-free could occur if it was necessary to reallocate (parts of) the frame. Fix this by reloading the variable after the code that results in the reallocations, if any. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.4.271, < 4.4.286 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9Patch
- https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78Patch
- https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4ddPatch
- https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258Patch
- https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32Patch
- https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0Patch
- https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8Patch
- https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbbPatch
- https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9Patch
- https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78Patch
- https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4ddPatch
- https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258Patch
- https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32Patch
- https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0Patch
- https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8Patch
FAQ
What is CVE-2021-47388?
CVE-2021-47388 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for fragmentation we need to copy the PN to the...
How severe is CVE-2021-47388?
CVE-2021-47388 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47388?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.