CVE-2025-21938— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mptcp_pm_nl_append_new_local_addr存在竞态条件，可能导致调度时原子性违规。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d045b9eb95a9b611c483897a69e7285aefdc66d7< f1404f368c40fc6a068dad72e4ee0824ee6a78ee |
affected |
d045b9eb95a9b611c483897a69e7285aefdc66d7< f3fcdb2de9fdbed9d8c6a8eb2c5fbd7d6f54a4d8 |
affected | ||
d045b9eb95a9b611c483897a69e7285aefdc66d7< 4b228dae3d2cc6d9dce167449cd8fa9f028e9376 |
affected | ||
d045b9eb95a9b611c483897a69e7285aefdc66d7< 125ccafe6dd062901b5a0c31ee9038740fc8859e |
affected | ||
d045b9eb95a9b611c483897a69e7285aefdc66d7< 022bfe24aad8937705704ff2e414b100cf0f2e1a |
affected | ||
5.18 |
affected | ||
< 5.18 |
unaffected | ||
6.1.131≤ 6.1.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2025-21938 基础信息
漏洞信息
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Vulnerability Title
mptcp: fix 'scheduling while atomic' in mptcp_pm_nl_append_new_local_addr
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: fix 'scheduling while atomic' in mptcp_pm_nl_append_new_local_addr
If multiple connection requests attempt to create an implicit mptcp
endpoint in parallel, more than one caller may end up in
mptcp_pm_nl_append_new_local_addr because none found the address in
local_addr_list during their call to mptcp_pm_nl_get_local_id. In this
case, the concurrent new_local_addr calls may delete the address entry
created by the previous caller. These deletes use synchronize_rcu, but
this is not permitted in some of the contexts where this function may be
called. During packet recv, the caller may be in a rcu read critical
section and have preemption disabled.
An example stack:
BUG: scheduling while atomic: swapper/2/0/0x00000302
Call Trace:
<IRQ>
dump_stack_lvl (lib/dump_stack.c:117 (discriminator 1))
dump_stack (lib/dump_stack.c:124)
__schedule_bug (kernel/sched/core.c:5943)
schedule_debug.constprop.0 (arch/x86/include/asm/preempt.h:33 kernel/sched/core.c:5970)
__schedule (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:207 kernel/sched/features.h:29 kernel/sched/core.c:6621)
schedule (arch/x86/include/asm/preempt.h:84 kernel/sched/core.c:6804 kernel/sched/core.c:6818)
schedule_timeout (kernel/time/timer.c:2160)
wait_for_completion (kernel/sched/completion.c:96 kernel/sched/completion.c:116 kernel/sched/completion.c:127 kernel/sched/completion.c:148)
__wait_rcu_gp (include/linux/rcupdate.h:311 kernel/rcu/update.c:444)
synchronize_rcu (kernel/rcu/tree.c:3609)
mptcp_pm_nl_append_new_local_addr (net/mptcp/pm_netlink.c:966 net/mptcp/pm_netlink.c:1061)
mptcp_pm_nl_get_local_id (net/mptcp/pm_netlink.c:1164)
mptcp_pm_get_local_id (net/mptcp/pm.c:420)
subflow_check_req (net/mptcp/subflow.c:98 net/mptcp/subflow.c:213)
subflow_v4_route_req (net/mptcp/subflow.c:305)
tcp_conn_request (net/ipv4/tcp_input.c:7216)
subflow_v4_conn_request (net/mptcp/subflow.c:651)
tcp_rcv_state_process (net/ipv4/tcp_input.c:6709)
tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1934)
tcp_v4_rcv (net/ipv4/tcp_ipv4.c:2334)
ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 1))
ip_local_deliver_finish (include/linux/rcupdate.h:813 net/ipv4/ip_input.c:234)
ip_local_deliver (include/linux/netfilter.h:314 include/linux/netfilter.h:308 net/ipv4/ip_input.c:254)
ip_sublist_rcv_finish (include/net/dst.h:461 net/ipv4/ip_input.c:580)
ip_sublist_rcv (net/ipv4/ip_input.c:640)
ip_list_rcv (net/ipv4/ip_input.c:675)
__netif_receive_skb_list_core (net/core/dev.c:5583 net/core/dev.c:5631)
netif_receive_skb_list_internal (net/core/dev.c:5685 net/core/dev.c:5774)
napi_complete_done (include/linux/list.h:37 include/net/gro.h:449 include/net/gro.h:444 net/core/dev.c:6114)
igb_poll (drivers/net/ethernet/intel/igb/igb_main.c:8244) igb
__napi_poll (net/core/dev.c:6582)
net_rx_action (net/core/dev.c:6653 net/core/dev.c:6787)
handle_softirqs (kernel/softirq.c:553)
__irq_exit_rcu (kernel/softirq.c:588 kernel/softirq.c:427 kernel/softirq.c:636)
irq_exit_rcu (kernel/softirq.c:651)
common_interrupt (arch/x86/kernel/irq.c:247 (discriminator 14))
</IRQ>
This problem seems particularly prevalent if the user advertises an
endpoint that has a different external vs internal address. In the case
where the external address is advertised and multiple connections
already exist, multiple subflow SYNs arrive in parallel which tends to
trigger the race during creation of the first local_addr_list entries
which have the internal address instead.
Fix by skipping the replacement of an existing implicit local address if
called via mptcp_pm_nl_get_local_id.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mptcp_pm_nl_append_new_local_addr存在竞态条件，可能导致调度时原子性违规。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2025-21938 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21938 补丁与修复 (5)
同批安全公告 · Linux · 2025-04-01 · 共 93 条
| CVE-2025-21927 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21954 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21969 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21955 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21972 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21946 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21967 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21947 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21934 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21923 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21949 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21919 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21914 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21924 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21958 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21965 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21926 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21985 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 93 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21938
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