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LXC doesn't currently have a syntax to hold a multi-line environment variable in its configuration. The use of multi-line environment variables leads to a corrupted configuration file and to a security issue where additional lines may be added by an unprivileged user to escalate their privileges. This fixes CVE-2026-23953. Reported-by: Rory McNamara <[email protected]> Signed-off-by: Stéphane Graber <[email protected]>
hallyn
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cyphar
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cyphar
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Jan 22, 2026
This fixes three security issues related to file templates: - The template target path could be made to be relative or gothrough symlinks in a way that could lead to arbitrary write to the host filesystem. - The template directory could be relative, allowing for arbitrary read from the host filesystem. - The template file itself could be made relative, allowing for arbitrary reads from the host filesystem. In the case of the template target path, the new logic makes use of the kernel's openat2 system call which brings a variety of flags that can be used to restrict path resolution and detect potential issues. For the template path itself, we now validate that it is a simple local file and that the template directory isn't a symlink. This fixes CVE-2026-23954 Reported-by: Rory McNamara <[email protected]> Signed-off-by: Stéphane Graber <[email protected]>
This was referenced Feb 3, 2026
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Based on lxc/incus#2848 Related to GHSA-x6jc-phwx-hp32 (CVE-2026-23953) This addresses a security issue that was responsibly disclosed to the Incus security team by Rory McNamara of snyk.io.
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Based on lxc/incus#2848 Related to GHSA-7f67-crqm-jgh7 (CVE-2026-23954) This addresses a security issue that was responsibly disclosed to the Incus security team by Rory McNamara of snyk.io.
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This addresses two security issues that were responsibly disclosed to the Incus security team by Rory McNamara of snyk.io.
They cover: