CVE-2026-99172ipc: drop the mqueue mount with kern_unmount() on setup failure
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 13 days later
· 13 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected dc55e35f9e810f23dd69cfdc91a3d636023f57a2 – < 4dd36cf72d2c6c090958c0d7b542fa8211635d2d
- affected dc55e35f9e810f23dd69cfdc91a3d636023f57a2 – < 4aef6ceb4d6acacd53bc047ac4849677c3edbec1
- affected dc55e35f9e810f23dd69cfdc91a3d636023f57a2 – < c0620b648321fff654173d238d4a85298ea16d05
- affected dc55e35f9e810f23dd69cfdc91a3d636023f57a2 – < f0e48172a59e517e613b73f73cc35f24fd123aeb
- affected 5.19
- unaffected < 5.19
- unaffected 6.12.117 – ≤ 6.12.*
- unaffected 6.18.61 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References4
- https://git.kernel.org/stable/c/4dd36cf72d2c6c090958c0d7b542fa8211635d2d (opens in a new tab)
- https://git.kernel.org/stable/c/4aef6ceb4d6acacd53bc047ac4849677c3edbec1 (opens in a new tab)
- https://git.kernel.org/stable/c/c0620b648321fff654173d238d4a85298ea16d05 (opens in a new tab)
- https://git.kernel.org/stable/c/f0e48172a59e517e613b73f73cc35f24fd123aeb (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-111924 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-99172)Record last updated .