{"id":"CVE-2026-93204","summary":"batman-adv: dat: atomically update mac addresses","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: dat: atomically update mac addresses\n\nWhen a MAC address is updated in batadv_dat_entry_add(), it is done using a\nsimple copy function. A parallel reader might only see parts of this\nupdate. In worst case, the reader is transporting the half updated MAC\naddress over the network or is creating an ARP response using it -\npoisoning the ARP cache.\n\natomic64_t can be used to store the 48 bit of a mac address. A reader will\nthen either see the old mac address or the new one - never a mixture of\nboth.","modified":"2026-09-18T03:46:16.115369163Z","published":"2026-09-17T16:12:24.403Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93204.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274"},{"type":"WEB","url":"https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93204.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93204"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2f1dfbe185075a50dc8f0490a136377af53a1c62"},{"fixed":"159360a0de831845c4500b4f8638decdcd624040"},{"fixed":"259db2c04586d40b82c5c3002b1e28b0698a0bb7"},{"fixed":"1674855a5b6eacfe35f4db3095d7055c25467274"},{"fixed":"66238e2a74eca5dabf85b0cd2c3c944e474dc2fd"},{"fixed":"a5e4d6cb4f6848b8906c1c493f99a8ccc0638515"},{"fixed":"f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9"},{"fixed":"e6de568d3eda3e3c01c868fabd7a9535d5ee4a73"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93204.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93204.json"}}],"schema_version":"1.9.0"}