CVE-2026-93204 is a vulnerability in Linux Kernel
Published on September 17, 2026
batman-adv: dat: atomically update mac addresses
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.
Products Associated with CVE-2026-93204
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Affected Versions
Linux:- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below 159360a0de831845c4500b4f8638decdcd624040 is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below 259db2c04586d40b82c5c3002b1e28b0698a0bb7 is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below 1674855a5b6eacfe35f4db3095d7055c25467274 is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below a5e4d6cb4f6848b8906c1c493f99a8ccc0638515 is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9 is affected.
- Version 2f1dfbe185075a50dc8f0490a136377af53a1c62 and below e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 is affected.
- Version 3.8 is affected.
- Before 3.8 is unaffected.
- Version 5.15.221, <= 5.15.* is unaffected.
- Version 6.1.188, <= 6.1.* is unaffected.
- Version 6.6.157, <= 6.6.* is unaffected.
- Version 6.12.110, <= 6.12.* is unaffected.
- Version 6.18.52, <= 6.18.* is unaffected.
- Version 7.2.6, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.