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CVE-2026-99031— net: bridge: avoid recursive multicast port cleanup

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net: bridge: 避免递归清理多播端口 br_multicast_sg_del_exclude_ports() 函数通过调用 br_multicast_del_pg() 来移除自动添加的 STAR_EXCL 端口组。对于 (S,G) 条目，该删除操作会再次回调 br_multicast_sg_del_exclude_ports()。因此，当存在大量 STAR_EXCL 端口时，每个端口都会消耗一个内核栈帧，最终可能触及栈保护页（stack guard page）

AI Predicted 5.5 Difficulty: Hard EPSS 0.17% · P6 Updated Oct 23, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`8266a0491e92d39dc9af739e8380a0daa9b8836b< 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64`	affected
		`8266a0491e92d39dc9af739e8380a0daa9b8836b< 2fb87c6025f90191516bee3ce14b42eb3e1cfed7`	affected
		`8266a0491e92d39dc9af739e8380a0daa9b8836b< d109141ba14652146089ef78b32d5e4d5285ebad`	affected
		`8266a0491e92d39dc9af739e8380a0daa9b8836b< 7931fb9181421953f3133b408b0f2e2b8dd68b61`	affected
		`8266a0491e92d39dc9af739e8380a0daa9b8836b< 5158353121bae4f552cb677ce8c5c3ef52f93a0d`	affected
		`5.10`	affected
		`< 5.10`	unaffected
		`6.6.160≤ 6.6.*`	unaffected
… +4 more rows

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Vulnerability Information

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Vulnerability Title

net: bridge: avoid recursive multicast port cleanup

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: avoid recursive multicast port cleanup br_multicast_sg_del_exclude_ports() removes automatically added STAR_EXCL port groups by calling br_multicast_del_pg(). For S,G entries, that deletion calls back into br_multicast_sg_del_exclude_ports(), so a large number of STAR_EXCL ports consumes one kernel stack frame per port and can hit the stack guard page. Keep the complete port-group deletion path for cleanup, but suppress the S,G exclude-port cleanup while that helper is already walking the same entry. Normal deletion callers retain the existing behavior.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	8266a0491e92d39dc9af739e8380a0daa9b8836b ~ 695a5a4c69c922d9296b2d7ad5f1ce8c6858fc64	-
Linux	Linux	5.10	-

II. Public POCs for CVE-2026-99031

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99031

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Patches & Fixes for CVE-2026-99031 (5)

https://www.cve.org/CVERecord?id=CVE-2026-99031

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959	9.8 CRITICAL	btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988	8.8 HIGH	namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083	8.8 HIGH	ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082	8.8 HIGH	KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98870	8.8 HIGH	ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980	8.8 HIGH	namei: don't reveal overmounted entries in refwalk
CVE-2026-98981	8.8 HIGH	namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042	8.4 HIGH	io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978	8.4 HIGH	namespace: never expire a locked mount
CVE-2026-99064	8.1 HIGH	cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968	8.1 HIGH	amt: send the relay's General Query directly from the receive path
CVE-2026-98899	7.8 HIGH	netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99018	7.8 HIGH	riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99002	7.8 HIGH	drm/vmwgfx: validate pitch coming from userspace
CVE-2026-99016	7.8 HIGH	riscv: futex: untag the user pointer before the atomic access
CVE-2026-99051	7.8 HIGH	fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99032	7.8 HIGH	net/smc: protect clcsock lifetime in smc_getname
CVE-2026-98999	7.8 HIGH	drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin

Showing top 20 of 217 CVEs. View all on vendor page → →

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