CVE-2026-74586— Linux内核SCTP对等端移除时传输未清理漏洞
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。
在 Linux 内核中，已解决以下漏洞： sctp：在移除对等端时清除 new_transport 会将新添加的对等端传输地址存储在 中。在处理完 ASCONF 块中的所有参数后， 会使用此指针向新传输地址发送 HEARTBEAT（心跳）消息。 来自远程 SCTP 对等端经认证的 ASCONF 消息可以在同一个块中添加一个传输地址，并使用通配符 DEL-IP 参数立即将其移除。通配符删除会保留接收该 ASCONF 消息的传输地址，但通过 移除新添加的传输地址。然而，移除操作并未清空 ，导致该指针仍指向已被移除的传输
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< c0f973bb5118dd1b146cda3fcc8af6f6057befec |
affected |
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 3b539b317cd052236fed0350364ff1268996ba46 |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< db9d8e3b670f841755bc2018f178472dc6064d27 |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 31efa656cf6aface26e88f038c14f22ee6ca1500 |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 291accf36febce751021888de5f15090f4875b56 |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< ca33df36aa0143a1d04f57d2086020c12e7eddb7 |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< 163847552a571bd55094291f4ffcdc1de0f14a7b |
affected | ||
6af29ccc223b0feb6fc6112281c3fa3cdb1afddf< beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-74586 基础信息
漏洞信息
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Vulnerability Title
sctp: clear new_transport when removing a peer
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sctp: clear new_transport when removing a peer
sctp_process_asconf_param() stores a newly added peer transport in
asoc->new_transport. After all parameters in the ASCONF chunk have been
processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the
new transport.
An authenticated ASCONF from a remote SCTP peer can add a transport and
remove it again with a wildcard DEL-IP parameter in the same chunk. The
wildcard deletion preserves the transport on which the ASCONF arrived, but
removes the newly added transport through
sctp_assoc_del_nonprimary_peers(). The removal does not clear
asoc->new_transport, leaving it pointing to the removed transport.
sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points
to the removed transport without holding a transport reference. During
local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on
control_chunk_list. After the transport is freed by RCU, a successful
ASCONF_ACK for the replacement address releases the queued HEARTBEAT and
sctp_outq_select_transport() reads the freed transport's state.
The issue was found during a static audit of SCTP objects. With an
authenticated peer, the reproducer triggered the same KASAN report in 2
of 2 unpatched runs on a KASAN-enabled netdev/main kernel:
BUG: KASAN: slab-use-after-free in sctp_outq_select_transport
Read of size 4 at addr ffff88800b9bd95c by task python3/197
Call Trace:
sctp_outq_select_transport+0x549/0x8b0 [sctp]
sctp_outq_flush+0x306/0x2c60 [sctp]
sctp_transport_immediate_rtx+0xaf/0x260 [sctp]
sctp_process_asconf_ack+0xa48/0xf70 [sctp]
Allocated by task 197:
sctp_transport_new+0x68/0x650 [sctp]
sctp_assoc_add_peer+0x258/0x12a0 [sctp]
sctp_process_asconf+0x5e9/0x1090 [sctp]
Last potentially related work creation:
__call_rcu_common.constprop.0+0x77/0xb70
sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]
sctp_process_asconf+0xd9c/0x1090 [sctp]
The first invalid access was a four-byte read of transport->state at
net/sctp/outqueue.c:833. The same reproducer completed the full
authenticated ASCONF and local-address replacement sequence with this
change without a KASAN report or oops.
Clear new_transport when its peer is removed, before it can be used to
create the HEARTBEAT.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-74586 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74586 补丁与修复 (7)
同批安全公告 · Linux · 2026-08-22 · 共 150 条
| CVE-2026-74640 | ALSA FCP fcp_meter_ctl_get 缓冲区越界写漏洞 | |
| CVE-2026-74622 | Atlantic 网卡 RX 页面释放漏洞 | |
| CVE-2026-74623 | Atlantic网卡驱动TX缓冲区释放漏洞 | |
| CVE-2026-74624 | netfilter: nf_conntrack 解锁前延迟记录无效 | |
| CVE-2026-74625 | netfilter 网桥非IP路径模板连接跟踪释放漏洞 | |
| CVE-2026-74627 | net: devmem 防止 net-io v/页面混合漏洞 | |
| CVE-2026-74626 | NTB：ntb_netdev 分配失败时保留 RX 队列深度 | |
| CVE-2026-74628 | Linux内核 x25 远程计时器释放后使用漏洞 | |
| CVE-2026-74629 | net/dibs: 修复 dmb_clientid_arr 释放漏洞 | |
| CVE-2026-74631 | Linux SMC splice条目生命周期不平衡漏洞 | |
| CVE-2026-74630 | IPv6中in6_dev_get()防止复活inet6_dev漏洞 | |
| CVE-2026-74632 | Linux内核 huge_memory 竞态条件漏洞 | |
| CVE-2026-74633 | tracing: 修复模块事件缓存移除中的空指针解引用漏洞 | |
| CVE-2026-74634 | ring-buffer：禁用调整大小时防止子缓冲区间顺序变化 | |
| CVE-2026-74635 | fbdev bitblit bit_cursor() glyph索引越界漏洞 | |
| CVE-2026-74636 | tracing 工具更新字段与事件定义字段竞态条件漏洞 | |
| CVE-2026-74637 | Linux Perf 核心组件 组领导者 分离后释放后使用漏洞 | |
| CVE-2026-74639 | ALSA us144mkii 重新锚定捕获 URB 漏洞 | |
| CVE-2026-74638 | drm/v3d 调度器超时处理串行化漏洞 | |
| CVE-2026-74651 | rtl8723bs: 修复rtw_get_wpa_ie()中的越界读取漏洞 |
显示前 20 条，共 150 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-74586
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