CVE-2026-64190 (GCVE-0-2026-64190)
Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-10-21 12:43
VLAI
EPSS
VEX
Title
net: team: fix NULL pointer dereference in team_xmit during mode change
Summary
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.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 , < 9486377e5e971988a3add171c398eb654a866fab
(git)
Affected: 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 , < cde5c7f0286c4203d0abc7248201542aa8bf33bb (git) Affected: 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 , < 03e9405c518c4d61f28079492f252d6d4e2bac5c (git) Affected: 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 , < 25fe708bbc59289d3d1ea4b126fbc1b460a072a5 (git) |
guessed | |
| Linux | Linux |
Affected:
3.3
Unaffected: 0 , < 3.3 (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.114 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"id": "CVE-2026-64190",
"initial_release_date": "2026-07-20T00:00:00+00:00",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: team: fix NULL pointer dereference in team_xmit during mode change",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64190.json",
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}
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