CVE-2026-68409— mac80211 延迟链接RX统计 percpu 释放至 RCU
可能的 ATT&CK 技术 1AI
T1564.008 · Email Hiding Rules影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | c71420db653aba30a234d1e4cf86dde376e604fa< 2aa1789880fa5e41049b0f6a74a4fc2fa1997610 | affected |
c71420db653aba30a234d1e4cf86dde376e604fa< a03fceae0c65b31ce31840dac5e26684ceecb65b | affected | ||
c71420db653aba30a234d1e4cf86dde376e604fa< aa2eb62525188269cdd402a583b9a8ed94657ff0 | affected | ||
6.0 | affected | ||
< 6.0 | unaffected | ||
6.18.42≤ 6.18.* | unaffected | ||
7.1.6≤ 7.1.* | unaffected | ||
7.2-rc4≤ * | unaffected |
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一、 漏洞 CVE-2026-68409 基础信息
漏洞信息
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Vulnerability Title
wifi: mac80211: defer link RX stats percpu free to RCU
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: defer link RX stats percpu free to RCU sta_remove_link() frees a removed MLO link's RX stats percpu buffer right away, but defers only the link container to RCU: sta_info_free_link(&alloc->info); kfree_rcu(alloc, rcu_head); The RX fast path reads link_sta under rcu_read_lock and writes the percpu stats. A reader that resolved link_sta before the removal keeps the pointer. The container stays alive from the kfree_rcu, so the read still works. But the percpu block it points to is already freed. This needs uses_rss. That is when pcpu_rx_stats exists. The full STA teardown frees the deflink stats only after synchronize_net(). The link removal path had no such barrier. The race is hard to win in practice, but the free should still wait for RCU. Free the link together with its data from a single RCU callback, so the percpu block is reclaimed only after readers drain.
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-2026-68409 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-68409 补丁与修复 (3)
同批安全公告 · Linux · 2026-08-10 · 共 345 条
| CVE-2026-68310 | mt76: mt7915驱动HE能力查询保护 | |
| CVE-2026-68320 | Linux内核SCTP协议栈认证列表容量检查漏洞 | |
| CVE-2026-68319 | pds_core 重置与移除死锁漏洞 | |
| CVE-2026-68318 | pds_core 工作队列移除时存在释放后使用漏洞 | |
| CVE-2026-68317 | pds_core 辅助设备添加/删除竞态漏洞 | |
| CVE-2026-68316 | 加速驱动 Ethos-U 命令流校验元素大小处理漏洞 | |
| CVE-2026-68315 | SCTP协议栈在sctp_process_strreset_inreq()中验证流数 | |
| CVE-2026-68314 | Linux内核mctp i3c驱动注册失败处理漏洞 | |
| CVE-2026-68313 | TIPC __tipc_nl_compat_dumpit无限循环漏洞 | |
| CVE-2026-68312 | CIFS：kmalloc失败时cifsFileInfo泄漏 | |
| CVE-2026-68311 | mt7925无线网卡解封装卸载时STA链路保护缺陷 | |
| CVE-2026-68305 | drm/xe/vf CCS读写缓冲区分离时添加设备守卫 | |
| CVE-2026-68300 | Linux SCTP 认证模块空指针检查漏洞 | |
| CVE-2026-68301 | HSR 从节点注销内存泄漏漏洞 | |
| CVE-2026-68302 | amt: 拉取后重新读取skb头指针 | |
| CVE-2026-68303 | Linux内核 DRM VC4 HVS/V3D 解除绑定空指针解引用漏洞 | |
| CVE-2026-68304 | brcmfmac Wi-Fi驱动 802.1X-SHA256调用跟踪警告漏洞 | |
| CVE-2026-68307 | mt7925 WiFi驱动重置链路重播崩溃漏洞 | |
| CVE-2026-68309 | mt76驱动BSS HE TLV处理空指针解引用漏洞 | |
| CVE-2026-68308 | mt76_connac_get_he_phy_cap()返回值未检查 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-68409
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