Linux Kernel MLE Defragmentation Pointer Overrun Vulnerability
CVE-2026-64515 Published on July 25, 2026
wifi: mac80211: fix MLE defragmentation
In the Linux kernel, the following vulnerability has been resolved:
wifi: mac80211: fix MLE defragmentation
If either reconf or EPCS multi-link element (MLE) is contained in
a non-transmitted profile, the defragmentation routine is called
with a pointer to the defragmented copy, but the original elements.
This is incorrect for two reasons:
- if the original defragmentation was needed, it will not find the
correct data
- if the original frame is at a higher address, the parsing will
potentially overrun the heap data (though given the layout of
the buffers, only into the new defragmentation buffer, and then
it has to stop and fail once that's filled with copied data.
Fix it by tracking the container along with the pointer and in
doing so also unify the two almost identical defragmentation
routines.
Products Associated with CVE-2026-64515
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Affected Versions
Linux:- Version 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and below 1f573e17bcb7275ddd1c8f47f46ae0faf0e902a4 is affected.
- Version 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and below 55c479aae99b120489a432db9c717484e523dfd6 is affected.
- Version 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and below 722b3f86df80644463d29fe5451e30a617f74500 is affected.
- Version 4d70e9c5488dd57ff5fcabe4d4ecf3d9dd4555ff and below a74e893f30db64cdce0fc7a96d3baa417bcd55f5 is affected.
- Version 6.9 is affected.
- Before 6.9 is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.