CVE-2026-93204
Description
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.
How to fix
- Linux Linux181012b3d29c51197c235ee5871fc7512c736855, 159360a0de831845c4500b4f8638decdcd624040, 259db2c04586d40b82c5c3002b1e28b0698a0bb7, 1674855a5b6eacfe35f4db3095d7055c25467274, 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd, a5e4d6cb4f6848b8906c1c493f99a8ccc0638515, f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9, e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < 181012b3d29c51197c235ee5871fc7512c736855, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < 159360a0de831845c4500b4f8638decdcd624040, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < 259db2c04586d40b82c5c3002b1e28b0698a0bb7, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < 1674855a5b6eacfe35f4db3095d7055c25467274, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < a5e4d6cb4f6848b8906c1c493f99a8ccc0638515, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9, 2f1dfbe185075a50dc8f0490a136377af53a1c62 ≤ v < e6de568d3eda3e3c01c868fabd7a9535d5ee4a73, 3.8 | 181012b3d29c51197c235ee5871fc7512c736855, 159360a0de831845c4500b4f8638decdcd624040, 259db2c04586d40b82c5c3002b1e28b0698a0bb7, 1674855a5b6eacfe35f4db3095d7055c25467274, 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd, a5e4d6cb4f6848b8906c1c493f99a8ccc0638515, f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9, e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 |
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