{"id":"CVE-2026-93204","state":"PUBLISHED","title":"batman-adv: dat: atomically update mac addresses","description":"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.","publishedAt":"2026-09-17T16:12:24.403Z","updatedAt":"2026-10-19T09:07:16.519Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"181012b3d29c51197c235ee5871fc7512c736855","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"159360a0de831845c4500b4f8638decdcd624040","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"259db2c04586d40b82c5c3002b1e28b0698a0bb7","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"1674855a5b6eacfe35f4db3095d7055c25467274","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"e6de568d3eda3e3c01c868fabd7a9535d5ee4a73","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.8","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"]}],"references":["https://git.kernel.org/stable/c/181012b3d29c51197c235ee5871fc7512c736855","https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040","https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7","https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274","https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93204.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93204","state":"PUBLISHED","datePublished":"2026-09-17T16:12:24.403Z","dateUpdated":"2026-10-19T09:07:16.519Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.093Z"},"containers":{"cna":{"title":"batman-adv: dat: atomically update mac addresses","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"181012b3d29c51197c235ee5871fc7512c736855","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"159360a0de831845c4500b4f8638decdcd624040","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"259db2c04586d40b82c5c3002b1e28b0698a0bb7","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"1674855a5b6eacfe35f4db3095d7055c25467274","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","versionType":"git"},{"version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","status":"affected","lessThan":"e6de568d3eda3e3c01c868fabd7a9535d5ee4a73","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.8","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/181012b3d29c51197c235ee5871fc7512c736855"},{"url":"https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040"},{"url":"https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7"},{"url":"https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274"},{"url":"https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd"},{"url":"https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515"},{"url":"https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9"},{"url":"https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:07:16.519Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}