CVE-2026-93204

batman-adv: dat: atomically update mac addresses

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 17, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 181012b3d29c51197c235ee5871fc7512c736855Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 159360a0de831845c4500b4f8638decdcd624040Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 259db2c04586d40b82c5c3002b1e28b0698a0bb7Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 1674855a5b6eacfe35f4db3095d7055c25467274Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 66238e2a74eca5dabf85b0cd2c3c944e474dc2fdAffected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before a5e4d6cb4f6848b8906c1c493f99a8ccc0638515Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9Affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 to before e6de568d3eda3e3c01c868fabd7a9535d5ee4a73Affected
LinuxLinux	3.8Affected before 3.8Not affected 5.10.271 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 181012b3d29c51197c235ee5871fc7512c736855Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 159360a0de831845c4500b4f8638decdcd624040Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 259db2c04586d40b82c5c3002b1e28b0698a0bb7Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 1674855a5b6eacfe35f4db3095d7055c25467274Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before 66238e2a74eca5dabf85b0cd2c3c944e474dc2fdAffected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before a5e4d6cb4f6848b8906c1c493f99a8ccc0638515Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9Affected
2f1dfbe185075a50dc8f0490a136377af53a1c62 to before e6de568d3eda3e3c01c868fabd7a9535d5ee4a73Affected

LinuxLinux

3.8Affected
before 3.8Not affected
5.10.271 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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