CVE-2021-47388

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux608b0a2ae928a74a2f89e02227339dd79cdb63cf < 447d001b875d0e7f211c4ba004916028da994258affected
LinuxLinuxd0f613fe6de344dc17ba04a88921a2094c13d3fa < 31de381aef0ab1b342f62485118dc8a19363dc78affected
LinuxLinuxa9b57952fed41556c950a92123086724eaf11919 < f556e1d6fb9f2923a9a36f3df638c7d79ba09dbbaffected
LinuxLinux0f716b48ed25503e6961f4b5b40ece36f7e4ed26 < 3d5d629c99c468458022e9b381789de3595bf4ddaffected
LinuxLinuxc8b3a6150dc8ac78d5fdd5fbdfc4806249ef8b2c < 50149e0866a82cef33e680ee68dc380a5bc75d32affected
LinuxLinuxe64ea0597050157f926ac2ba9b478a44ee5be945 < 57de2dcb18742dc2860861c9f496da7d42b67da0affected
LinuxLinuxbf30ca922a0c0176007e074b0acc77ed345e9990 < 27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9affected
LinuxLinuxbf30ca922a0c0176007e074b0acc77ed345e9990 < 94513069eb549737bcfc3d988d6ed4da948a2de8affected
LinuxLinux1f0bf30c01d3f4de7d6c5e27b102a808c5646676affected
LinuxLinux4.4.271 < 4.4.286affected
LinuxLinux4.9.271 < 4.9.285affected
LinuxLinux4.14.235 < 4.14.249affected
LinuxLinux4.19.193 < 4.19.209affected
LinuxLinux5.4.124 < 5.4.151affected
LinuxLinux5.10.42 < 5.10.71affected
LinuxLinux5.12.9 < 5.13affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux4.4.286 <= 4.4.*unaffected
LinuxLinux4.9.285 <= 4.9.*unaffected
LinuxLinux4.14.249 <= 4.14.*unaffected
LinuxLinux4.19.209 <= 4.19.*unaffected
LinuxLinux5.4.151 <= 5.4.*unaffected
LinuxLinux5.10.71 <= 5.10.*unaffected
LinuxLinux5.14.10 <= 5.14.*unaffected
LinuxLinux5.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References