CVE-2021-47388 - CVE House
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Status published High CVE-2021-47388

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

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
608b0a2ae928a74a2f89e02227339dd79cdb63cf, d0f613fe6de344dc17ba04a88921a2094c13d3fa, a9b57952fed41556c950a92123086724eaf11919, 0f716b48ed25503e6961f4b5b40ece36f7e4ed26, c8b3a6150dc8ac78d5fdd5fbdfc4806249ef8b2c, e64ea0597050157f926ac2ba9b478a44ee5be945, bf30ca922a0c0176007e074b0acc77ed345e9990, 1f0bf30c01d3f4de7d6c5e27b102a808c5646676, 4.4.271, 4.9.271, 4.14.235, 4.19.193, 5.4.124, 5.10.42, 5.12.9, 5.13, 0, 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, 5.10.71, 5.14.10, 5.15

Timeline

Official Publish: May 21st, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.