CVE-2026-80842— 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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于主VLAN的多播上下文存在释放后重用问题，可能导致系统崩溃或内存破坏。
影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 7b54aaaf53cb784411426c64482af0435f7c845e< 3afaaee2f972aec9059110953adb62fa3cf5c4bd |
affected |
7b54aaaf53cb784411426c64482af0435f7c845e< 22226a2c3b90f15b0925f1464470d3baa6c5677e |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< 7c54fd8cfbcf371a5ef50db5c53fe6e85fb76686 |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< 3a0ad4fcdfa0b7dba1876de14a12cb65c8b5ca50 |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< c069f29da72324697aa4b7cab5b3647a7d24a575 |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< 3f4752996735e0628af559aa8da1d872c2fac13b |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< 57f94d3f4dee8b54d63cefddf1112be4656ef9e6 |
affected | ||
7b54aaaf53cb784411426c64482af0435f7c845e< 50e5c6605cc9c2dd57bd2d1b3459674d19738983 |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2026-80842 基础信息
漏洞信息
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Vulnerability Title
net: bridge: mcast: fix use-after-free of a master VLAN's multicast context
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: mcast: fix use-after-free of a master VLAN's multicast context
br_multicast_toggle_one_vlan() clears BR_VLFLAG_MCAST_ENABLED under
br->multicast_lock before stopping a VLAN's multicast context. That is
the teardown handshake: lockless readers gate on the flag through
br_multicast_ctx_should_use() -> br_multicast_ctx_vlan_disabled(), so
once it is cleared under the lock no reader can arm the context again.
For a master VLAN the handshake never runs. __vlan_del() clears
BRIDGE_VLAN_INFO_BRENTRY before calling br_vlan_put_master(), so
br_multicast_toggle_one_vlan(masterv, false) returns early on
!br_vlan_is_brentry(vlan): the flag stays set and br->multicast_lock is
never taken. br_vlan_put_master() then drains the context in
br_multicast_ctx_deinit() and frees the VLAN through call_rcu(), while a
reader still inside rcu_read_lock() sees the context as enabled and
re-arms it. The port and port-VLAN branch of the function has no
br_vlan_is_brentry() test and flips the flag under br->multicast_lock,
so it is not affected.
The reader is the bridge transmit path. For a master VLAN
br_multicast_rcv() selects brmctx = &vlan->br_mcast_ctx with
pmctx = NULL, so IGMP sent to the bridge device re-arms the context's
timers after br_multicast_ctx_deinit() has already stopped them.
BUG: KASAN: slab-use-after-free in detach_if_pending+0x412/0x4a0
Write of size 8 at addr ffff88810ac39918 by task brmc/601
__mod_timer+0x51a/0xc50
br_multicast_host_join+0x25b/0x390
__br_multicast_add_group+0x468/0x530
br_ip4_multicast_add_group+0x1a0/0x260
br_multicast_rcv+0x2cda/0x61e0
br_dev_xmit+0x6c4/0x1540
Allocated by task 610:
br_vlan_add+0x111/0xb40
br_vlan_info+0x370/0x3e0
Freed by task 0:
kfree+0x1a7/0x4f0
rcu_core+0x7dc/0x10a0
Only test br_vlan_is_brentry() when enabling, like the
br_multicast_ctx_vlan_global_disabled() test next to it. Disabling then
always clears BR_VLFLAG_MCAST_ENABLED under br->multicast_lock before
br_multicast_ctx_deinit() drains the context.
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
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于主VLAN的多播上下文存在释放后重用问题，可能导致系统崩溃或内存破坏。
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-2026-80842 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80842 补丁与修复 (7)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
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CVE-2026-98428
ALSA: usb: 6fire: Avoid embedded URBs
Same vendor: Linux
-
CVE-2026-98431
RDMA/uverbs: Fix mmap_lock/disassociation_lock circular depe -
CVE-2026-98430
RDMA/efa: Keep admin queues alive while IRQ is registered -
CVE-2026-98429
RDMA/efa: Keep EQ resources alive while IRQ is registered -
CVE-2026-98427
net/sched: codel: bound the dropping loop per dequeue call -
CVE-2026-98428
ALSA: usb: 6fire: Avoid embedded URBs
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