PSA-2026-00082: Proxmox Virtual Environment: TOCTOU issue when mounting (running) containers on the host
This Proxmox advisory covers a security issue in Proxmox Virtual Environment.
Key facts
- Fixed in
- pve-container 6.1.15
- Advisory id
- PSA-2026-00082
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
The pct mount and pct fstrim tasks lacked protection against concurrent modifications to the container mountpoint hierarchy by a running container.
An attacker with access to a running container could win the race against the incomplete checks, resulting in mounting of attacker-controlled directories over arbitrary host paths, which could be chained into root-level code execution on the host. This issue was found internally.
Packages: pve-container.
Affected product named by the advisory: Proxmox Virtual Environment.
Text from the source record.
Fix and mitigation
Upgrade to a fixed release named by Proxmox:
- pve-container 6.1.15
Vendor guidance
- Update to the fixed package versions: pve-container >= 6.1.15.
Support dates for the fixed release lines
- Proxmox VE 6: support ended
More Proxmox advisories
PSA-2026-00095Nov 10, 2026Proxmox Virtual Environment: Broken privilege checks when modifying container NICsPSA-2026-00094Nov 10, 2026Proxmox Virtual Environment: OCI extraction path escapePSA-2026-00093Nov 10, 2026Proxmox Virtual Environment: FRR config injection issuesPSA-2026-00092Nov 10, 2026Proxmox Virtual Environment: Missing and incomplete ACL checks in the SDN APIPSA-2026-00089Nov 10, 2026Proxmox: Several issues in libpve-http-server-perlPSA-2026-00088Nov 10, 2026Proxmox Virtual Environment: Shell command injection via volume name
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