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CVE-2026-64190— net: team: fix NULL pointer dereference in team_xmit during mode change

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.3版本存在安全漏洞，该漏洞源于团队设备模式更改时，对ops结构体未正确处理，可能导致并发传输操作读取NULL函数指针，造成内核空指针取消引用和崩溃。

AI Predicted 6.5 Difficulty: Hard EPSS 0.10% · P1

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80< 03e9405c518c4d61f28079492f252d6d4e2bac5c affected
3d249d4ca7d0ed6629a135ea1ea21c72286c0d80< 25fe708bbc59289d3d1ea4b126fbc1b460a072a5 affected
3.3 affected
< 3.3 unaffected
6.18.35≤ 6.18.* unaffected
7.1≤ * unaffected
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I. Basic Information for CVE-2026-64190

Vulnerability Information
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Vulnerability Title
net: team: fix NULL pointer dereference in team_xmit during mode change
Source: CVE Program / CVE List V5
Vulnerability 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->ops with memset() before restoring safe dummy handlers via team_adjust_ops(). A concurrent team_xmit() running under RCU on another CPU can read team->ops.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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.3版本存在安全漏洞，该漏洞源于团队设备模式更改时，对ops结构体未正确处理，可能导致并发传输操作读取NULL函数指针，造成内核空指针取消引用和崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 ~ 03e9405c518c4d61f28079492f252d6d4e2bac5c -
Linux Linux 3.3 -

II. Public POCs for CVE-2026-64190

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III. Intelligence Information for CVE-2026-64190

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Patches & Fixes for CVE-2026-64190 (1)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-64206 8.8 HIGH Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
CVE-2026-64188 7.8 HIGH net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-64189 7.8 HIGH netfilter: ipset: fix race between dump and ip_set_list resize
CVE-2026-64191 7.8 HIGH i2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64187 xfs: fail recovery on a committed log item with no regions
CVE-2026-64192 bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
CVE-2026-64205 i2c: i801: fix hardware state machine corruption in error path
CVE-2026-64207 net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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