{"cve":"CVE-2021-47388","nvd":{"published":"2024-05-21T15:15:24.257","modified":"2026-08-04T10:17:01.107","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmac80211: fix use-after-free in CCMP/GCMP RX\n\nWhen PN checking is done in mac80211, for fragmentation we need\nto copy the PN to the RX struct so we can later use it to do a\ncomparison, since commit bf30ca922a0c (\"mac80211: check defrag\nPN against current frame\").\n\nUnfortunately, in that commit I used the 'hdr' variable without\nit being necessarily valid, so use-after-free could occur if it\nwas necessary to reallocate (parts of) the frame.\n\nFix this by reloading the variable after the code that results\nin the reallocations, if any.\n\nThis fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9","https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78","https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd","https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258","https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47388","score":0.00342,"percentile":0.27708,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}