{"id":"CVE-2026-64190","state":"PUBLISHED","title":"net: team: fix NULL pointer dereference in team_xmit during mode change","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: fix NULL pointer dereference in team_xmit during mode change\n\n__team_change_mode() clears team->ops with memset() before restoring\nsafe dummy handlers via team_adjust_ops(). A concurrent team_xmit()\nrunning under RCU on another CPU can read team->ops.transmit during\nthis window and call a NULL function pointer, crashing the kernel.\n\nThe race requires a mode change (CAP_NET_ADMIN) concurrent with\ntransmit on the team device.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n Oops: 0010 [#1] SMP KASAN NOPTI\n RIP: 0010:0x0\n Call Trace:\n  team_xmit (drivers/net/team/team_core.c:1853)\n  dev_hard_start_xmit (net/core/dev.c:3904)\n  __dev_queue_xmit (net/core/dev.c:4871)\n  packet_sendmsg (net/packet/af_packet.c:3109)\n  __sys_sendto (net/socket.c:2265)\n\nThe original code assumed that no ports means no traffic, so mode\nchanges could freely memset()/memcpy() the ops.  AF_PACKET with\nforced carrier breaks that assumption.\n\nPrevent the race instead of making it safe: replace memset()/memcpy()\nwith per-field updates that never touch transmit or receive.  Those\ntwo handlers are managed solely by team_adjust_ops(), which already\ninstalls dummies when tx_en_port_count == 0 (always true during mode\nchange since no ports are present).  WRITE_ONCE/READ_ONCE prevent\nstore/load tearing on the handler pointers.\n\nsynchronize_net() before exit_op() drains in-flight readers that may\nstill reference old mode state from before port removal switched the\nhandlers to dummies.","publishedAt":"2026-07-20T16:27:48.314Z","updatedAt":"2026-10-30T12:27:40.497Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"d61bf3bc17de1e18cbdac94cf5389bb9dc2ddfe7","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"ac342f86638f5e184c8511cff12a421aea56acc6","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"a879f78c478cee77f4bd43e92225a640c23f45d4","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"9486377e5e971988a3add171c398eb654a866fab","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"cde5c7f0286c4203d0abc7248201542aa8bf33bb","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"03e9405c518c4d61f28079492f252d6d4e2bac5c","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"25fe708bbc59289d3d1ea4b126fbc1b460a072a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/team/team_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/team/team_core.c"]}],"references":["https://git.kernel.org/stable/c/d61bf3bc17de1e18cbdac94cf5389bb9dc2ddfe7","https://git.kernel.org/stable/c/ac342f86638f5e184c8511cff12a421aea56acc6","https://git.kernel.org/stable/c/a879f78c478cee77f4bd43e92225a640c23f45d4","https://git.kernel.org/stable/c/9486377e5e971988a3add171c398eb654a866fab","https://git.kernel.org/stable/c/cde5c7f0286c4203d0abc7248201542aa8bf33bb","https://git.kernel.org/stable/c/03e9405c518c4d61f28079492f252d6d4e2bac5c","https://git.kernel.org/stable/c/25fe708bbc59289d3d1ea4b126fbc1b460a072a5"],"weaknesses":[],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64190.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64190","state":"PUBLISHED","datePublished":"2026-07-20T16:27:48.314Z","dateUpdated":"2026-10-30T12:27:40.497Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.040Z"},"containers":{"cna":{"title":"net: team: fix NULL pointer dereference in team_xmit during mode change","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: team: fix NULL pointer dereference in team_xmit during mode change\n\n__team_change_mode() clears team->ops with memset() before restoring\nsafe dummy handlers via team_adjust_ops(). A concurrent team_xmit()\nrunning under RCU on another CPU can read team->ops.transmit during\nthis window and call a NULL function pointer, crashing the kernel.\n\nThe race requires a mode change (CAP_NET_ADMIN) concurrent with\ntransmit on the team device.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n Oops: 0010 [#1] SMP KASAN NOPTI\n RIP: 0010:0x0\n Call Trace:\n  team_xmit (drivers/net/team/team_core.c:1853)\n  dev_hard_start_xmit (net/core/dev.c:3904)\n  __dev_queue_xmit (net/core/dev.c:4871)\n  packet_sendmsg (net/packet/af_packet.c:3109)\n  __sys_sendto (net/socket.c:2265)\n\nThe original code assumed that no ports means no traffic, so mode\nchanges could freely memset()/memcpy() the ops.  AF_PACKET with\nforced carrier breaks that assumption.\n\nPrevent the race instead of making it safe: replace memset()/memcpy()\nwith per-field updates that never touch transmit or receive.  Those\ntwo handlers are managed solely by team_adjust_ops(), which already\ninstalls dummies when tx_en_port_count == 0 (always true during mode\nchange since no ports are present).  WRITE_ONCE/READ_ONCE prevent\nstore/load tearing on the handler pointers.\n\nsynchronize_net() before exit_op() drains in-flight readers that may\nstill reference old mode state from before port removal switched the\nhandlers to dummies."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"d61bf3bc17de1e18cbdac94cf5389bb9dc2ddfe7","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"ac342f86638f5e184c8511cff12a421aea56acc6","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"a879f78c478cee77f4bd43e92225a640c23f45d4","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"9486377e5e971988a3add171c398eb654a866fab","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"cde5c7f0286c4203d0abc7248201542aa8bf33bb","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"03e9405c518c4d61f28079492f252d6d4e2bac5c","versionType":"git"},{"version":"3d249d4ca7d0ed6629a135ea1ea21c72286c0d80","status":"affected","lessThan":"25fe708bbc59289d3d1ea4b126fbc1b460a072a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/team/team_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.3","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/team/team_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d61bf3bc17de1e18cbdac94cf5389bb9dc2ddfe7"},{"url":"https://git.kernel.org/stable/c/ac342f86638f5e184c8511cff12a421aea56acc6"},{"url":"https://git.kernel.org/stable/c/a879f78c478cee77f4bd43e92225a640c23f45d4"},{"url":"https://git.kernel.org/stable/c/9486377e5e971988a3add171c398eb654a866fab"},{"url":"https://git.kernel.org/stable/c/cde5c7f0286c4203d0abc7248201542aa8bf33bb"},{"url":"https://git.kernel.org/stable/c/03e9405c518c4d61f28079492f252d6d4e2bac5c"},{"url":"https://git.kernel.org/stable/c/25fe708bbc59289d3d1ea4b126fbc1b460a072a5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:27:40.497Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"6.18.35"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.3","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}