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CVE-2021-47388

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.4.286, 4.9.285, 4.14.249, 4.19.209, 5.4.151, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 4.4.271 · fixed in 4.4.286; From 4.9.271 · fixed in 4.9.285; From 4.14.235 · fixed in 4.14.249; From 4.19.193 · fixed in 4.19.209; From 5.4.124 · fixed in 5.4.151; From 5.10.42 · fixed in 5.10.71; From 5.12.9 · fixed in 5.13

  • Linux Linux

    5.13

References 8

git.kernel.org