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CVE-2026-99172— ipc: drop the mqueue mount with kern_unmount() on setup failure

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： ipc：在初始化失败时，使用卸载 mqueue 挂载点函数通过创建 mqueue 挂载点，因此其被设置为。随后，若在设置 mqueue 或 ipc 的 sysctl 参数时失败，或者执行失败，会调用普通的来释放该挂载点。由于已设置，会走的快速路径，导致引用计数降为零，但没有任何机制真正卸载该挂载点。最终，该挂载点及其对应的 mqueue 超级块（superblock）发生内存泄漏。提交 dc55e35f9e81（"ipc: Store mqueu

AI Predicted 5.5 Difficulty: Hard Updated Oct 28, 2026

Possible ATT&CK Techniques 3 AI

T1055 · Process Injection T1070 · Indicator Removal T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Linux	Linux	`dc55e35f9e810f23dd69cfdc91a3d636023f57a2< c0620b648321fff654173d238d4a85298ea16d05`	affected
		`dc55e35f9e810f23dd69cfdc91a3d636023f57a2< f0e48172a59e517e613b73f73cc35f24fd123aeb`	affected
		`5.19`	affected
		`< 5.19`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

ipc: drop the mqueue mount with kern_unmount() on setup failure

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ipc: drop the mqueue mount with kern_unmount() on setup failure mq_init_ns() creates the mqueue mount with fc_mount_longterm(), so its ->mnt_ns is MNT_NS_INTERNAL. When setting up the mqueue or ipc sysctls or msg_init_ns() fails afterwards, create_ipc_ns() drops it with a plain mntput(). With ->mnt_ns set that takes the fast path of mntput_no_expire(). The count drops to zero and nothing ever kills the mount, so the mount and the mqueue superblock are leaked. Commit dc55e35f9e81 ("ipc: Store mqueue sysctls in the ipc namespace") added the first failure path after mq_init_ns() and never dropped the mount. Commit 7229d74e5e8c ("ipc: create_ipc_ns: drop mqueue mount on sysctl setup failure") tried to fix that with a mntput() but that doesn't help for a long-term mount. Use kern_unmount(). free_ipc() open-codes the same thing for a namespace that made it.

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	dc55e35f9e810f23dd69cfdc91a3d636023f57a2 ~ c0620b648321fff654173d238d4a85298ea16d05	-
Linux	Linux	5.19	-

II. Public POCs for CVE-2026-99172

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99172

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Patches & Fixes for CVE-2026-99172 (1)

🔗 ipc: drop the mqueue mount with kern_unmount() on setup failure - kernel/git/stable/linux.git - Linux kernel stable tree Read full article

https://www.cve.org/CVERecord?id=CVE-2026-99172

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