{ "cveId": "CVE-2026-64190", "url": "https://patchblox.com/security/cve/CVE-2026-64190", "summary": "CVE-2026-64190 is fixed in 35 products on 1 platform, first by ALAS2023-2026-1881, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "net: team: fix NULL pointer dereference in team_xmit during mode change", "description": "In the Linux kernel, the following vulnerability has been resolved: net: team: fix NULL pointer dereference in team_xmit during mode change __team_change_mode() clears team-\u003Eops with memset() before restoring safe dummy handlers via team_adjust_ops(). A concurrent team_xmit() running under RCU on another CPU can read team-\u003Eops.transmit during this window and call a NULL function pointer, crashing the kernel. The race requires a mode change (CAP_NET_ADMIN) concurrent with transmit on the team device. BUG: kernel NULL pointer dereference, address: 0000000000000000 Oops: 0010 [#1] SMP KASAN NOPTI RIP: 0010:0x0 Call Trace: team_xmit (drivers/net/team/team_core.c:1853) dev_hard_start_xmit (net/core/dev.c:3904) __dev_queue_xmit (net/core/dev.c:4871) packet_sendmsg (net/packet/af_packet.c:3109) __sys_sendto (net/socket.c:2265) The original code assumed that no ports means no traffic, so mode changes could freely memset()/memcpy() the ops. AF_PACKET with forced carrier breaks that assumption. Prevent the race instead of making it safe: replace memset()/memcpy() with per-field updates that never touch transmit or receive. Those two handlers are managed solely by team_adjust_ops(), which already installs dummies when tx_en_port_count == 0 (always true during mode change since no ports are present). WRITE_ONCE/READ_ONCE prevent store/load tearing on the handler pointers. synchronize_net() before exit_op() drains in-flight readers that may still reference old mode state from before port removal switched the handlers to dummies.", "published": "2026-06-22T09:00:00Z", "severity": "Moderate", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00118, "epssPercentile": 0.01746, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64190", "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.35-68.127.amzn2023", "fix": "ALAS2023-2026-1881", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881", "released": "2026-06-22T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.35-68.127.amzn2023", "fix": "ALAS2023-2026-1881", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1881", "released": "2026-06-22T09:00:00Z" }, { "platform": "linux", "product": "dtb-aarch64", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.38.1", "fix": "OPENSUSE-SU-2026:21910-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1", "released": "2026-09-22T15:26:20Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "opensuse-leap 16.0", "fixedVersion": "6.12.0-160000.38.1", "fix": "OPENSUSE-SU-2026:21910-1", "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21910-1", "released": "2026-09-22T15:26:20Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.81.1", "fix": "SUSE-SU-2026:4254-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4254-1", "released": "2026-10-07T22:31:36Z" }, { "platform": "linux", "product": 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