CVE-2026-93204
Description
AI Translation Available
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: dat: atomically update mac addresses
When a MAC address is updated in batadv_dat_entry_add(), it is done using a
simple copy function. A parallel reader might only see parts of this
update. In worst case, the reader is transporting the half updated MAC
address over the network or is creating an ARP response using it -
poisoning the ARP cache.
atomic64_t can be used to store the 48 bit of a mac address. A reader will
then either see the old mac address or the new one - never a mixture of
both.
https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040
https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274
https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7
https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd
https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515
https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73
https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9