CVE-2021-47388

mac80211: fix use-after-free in CCMP/GCMP RX

State: Published
Severity: 8.8 High
Published: May 21, 2024
Updated: Aug 5, 2026
Reserved: May 21, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	608b0a2ae928a74a2f89e02227339dd79cdb63cf to before 447d001b875d0e7f211c4ba004916028da994258Affected d0f613fe6de344dc17ba04a88921a2094c13d3fa to before 31de381aef0ab1b342f62485118dc8a19363dc78Affected a9b57952fed41556c950a92123086724eaf11919 to before f556e1d6fb9f2923a9a36f3df638c7d79ba09dbbAffected 0f716b48ed25503e6961f4b5b40ece36f7e4ed26 to before 3d5d629c99c468458022e9b381789de3595bf4ddAffected c8b3a6150dc8ac78d5fdd5fbdfc4806249ef8b2c to before 50149e0866a82cef33e680ee68dc380a5bc75d32Affected e64ea0597050157f926ac2ba9b478a44ee5be945 to before 57de2dcb18742dc2860861c9f496da7d42b67da0Affected bf30ca922a0c0176007e074b0acc77ed345e9990 to before 27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9Affected bf30ca922a0c0176007e074b0acc77ed345e9990 to before 94513069eb549737bcfc3d988d6ed4da948a2de8Affected 1f0bf30c01d3f4de7d6c5e27b102a808c5646676Affected 4.4.271 to before 4.4.286Affected 4.9.271 to before 4.9.285Affected 4.14.235 to before 4.14.249Affected 4.19.193 to before 4.19.209Affected 5.4.124 to before 5.4.151Affected 5.10.42 to before 5.10.71Affected 5.12.9 to before 5.13Affected
LinuxLinux	5.13Affected before 5.13Not affected 4.4.286 through 4.4.Not affected 4.9.285 through 4.9.Not affected 4.14.249 through 4.14.Not affected 4.19.209 through 4.19.Not affected 5.4.151 through 5.4.Not affected 5.10.71 through 5.10.Not affected 5.14.10 through 5.14.*Not affected 5.15 and laterNot affected

Product

Versions

LinuxLinux

608b0a2ae928a74a2f89e02227339dd79cdb63cf to before 447d001b875d0e7f211c4ba004916028da994258Affected
d0f613fe6de344dc17ba04a88921a2094c13d3fa to before 31de381aef0ab1b342f62485118dc8a19363dc78Affected
a9b57952fed41556c950a92123086724eaf11919 to before f556e1d6fb9f2923a9a36f3df638c7d79ba09dbbAffected
0f716b48ed25503e6961f4b5b40ece36f7e4ed26 to before 3d5d629c99c468458022e9b381789de3595bf4ddAffected
c8b3a6150dc8ac78d5fdd5fbdfc4806249ef8b2c to before 50149e0866a82cef33e680ee68dc380a5bc75d32Affected
e64ea0597050157f926ac2ba9b478a44ee5be945 to before 57de2dcb18742dc2860861c9f496da7d42b67da0Affected
bf30ca922a0c0176007e074b0acc77ed345e9990 to before 27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9Affected
bf30ca922a0c0176007e074b0acc77ed345e9990 to before 94513069eb549737bcfc3d988d6ed4da948a2de8Affected
1f0bf30c01d3f4de7d6c5e27b102a808c5646676Affected
4.4.271 to before 4.4.286Affected
4.9.271 to before 4.9.285Affected
4.14.235 to before 4.14.249Affected
4.19.193 to before 4.19.209Affected
5.4.124 to before 5.4.151Affected
5.10.42 to before 5.10.71Affected
5.12.9 to before 5.13Affected

LinuxLinux

5.13Affected
before 5.13Not affected
4.4.286 through 4.4.*Not affected
4.9.285 through 4.9.*Not affected
4.14.249 through 4.14.*Not affected
4.19.209 through 4.19.*Not affected
5.4.151 through 5.4.*Not affected
5.10.71 through 5.10.*Not affected
5.14.10 through 5.14.*Not affected
5.15 and laterNot affected

References

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