{"api_version":"1","generated_at":"2026-09-20T16:03:32+00:00","cve":"CVE-2026-93204","urls":{"html":"https://cve.report/CVE-2026-93204","api":"https://cve.report/api/cve/CVE-2026-93204.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93204","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93204"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:18:16","updated_at":"2026-09-17 17:18:16"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","name":"https://git.kernel.org/stable/c/a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040","name":"https://git.kernel.org/stable/c/159360a0de831845c4500b4f8638decdcd624040","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7","name":"https://git.kernel.org/stable/c/259db2c04586d40b82c5c3002b1e28b0698a0bb7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","name":"https://git.kernel.org/stable/c/66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","name":"https://git.kernel.org/stable/c/f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274","name":"https://git.kernel.org/stable/c/1674855a5b6eacfe35f4db3095d7055c25467274","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73","name":"https://git.kernel.org/stable/c/e6de568d3eda3e3c01c868fabd7a9535d5ee4a73","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93204","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93204","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 159360a0de831845c4500b4f8638decdcd624040 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 259db2c04586d40b82c5c3002b1e28b0698a0bb7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 1674855a5b6eacfe35f4db3095d7055c25467274 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2f1dfbe185075a50dc8f0490a136377af53a1c62 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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00:14:31"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"159360a0de831845c4500b4f8638decdcd624040","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"259db2c04586d40b82c5c3002b1e28b0698a0bb7","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"1674855a5b6eacfe35f4db3095d7055c25467274","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"66238e2a74eca5dabf85b0cd2c3c944e474dc2fd","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"a5e4d6cb4f6848b8906c1c493f99a8ccc0638515","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"},{"lessThan":"e6de568d3eda3e3c01c868fabd7a9535d5ee4a73","status":"affected","version":"2f1dfbe185075a50dc8f0490a136377af53a1c62","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/distributed-arp-table.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.8"},{"lessThan":"3.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:12:24.403Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}],"title":"batman-adv: dat: atomically update mac addresses","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93204","datePublished":"2026-09-17T16:12:24.403Z","dateReserved":"2026-09-17T16:02:15.093Z","dateUpdated":"2026-09-17T16:12:24.403Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:18:16","lastModifiedDate":"2026-09-17 17:18:16","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93204","Ordinal":"1","Title":"batman-adv: dat: atomically update mac addresses","CVE":"CVE-2026-93204","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93204","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"batman-adv: dat: atomically update mac addresses"}]}}}