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CVE

CVE-2026-87799

Arbitrary file write on LXD host via symlink in migration stream
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CVE

CVE-2026-87799

Arbitrary file write on LXD host via symlink in migration stream

Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client that can create instances or custom storage volumes in a project, or a malicious migration source server, to write attacker-controlled files to arbitrary paths on the target host as root, leading to full host compromise. The attacker does this with a crafted rsync or btrfs send stream that plants a symlink in the transferred volume, such as rootfs or root.img, and then writes through it.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87799.json, https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr, https://nvd.nist.gov/vuln/detail/CVE-2026-87799, https://github.com/canonical/lxd

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00407%
EPSS Percentile
0.34717%
Introduced Version
0,v7.0.0,v7.0.0-20260501231825-40dd4f151d52,v7.0.2-0.20260711002902-16ac4855c86c,v6.0.1,v6.0.1-0.20240405150957-bf519f9ab21a,v6.0.7-0.20260327180354-22250ad42e2c,v0.1.0,v0.0.0-20230930034430-d33cb2388a78,v0.0.0-20230929202955-5eab39f7d182,v0.0.0-20230809055229-78cea072e604,v0.0.0-20230809033550-59f049aad8e8,v0.0.0-20230731212712-ab0295afdd26,v0.0.0-20230731212529-7673a78986e4,v0.0.0-20230704205107-bfa9fa7c9331,v0.0.0-20200514135447-9cd32f57a619,v0.0.0-20200324144057-949aaf40b2fa,v0.0.0-20200313175654-b436bd011f65,v0.0.0-20200224090052-19134c978cc3,v0.0.0-20191220001319-dee5cc86bc6f,v0.0.0-20191009113843-341103d806bb,v0.0.0-20160210030205-24b651c310a4,v0.0.0-20150915214518-e63e9cd017cd,v0.0.0-20150306153812-376d699d334f
Fix Available
3c94d4fae7ff57e0ee79850135a277f53a18753c,v7.5.0,v7.4.1-0.20260924224850-b46c2b45f16f,v7.0.2-0.20260925005550-9afa3d58ef9f,v6.0.7-0.20260925034325-f380ea65bb76

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