CVE-2026-40243
published 2026-05-06CVE-2026-40243: Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation logic in the OVN database connection logic can allow…
PriorityP427medium4.8CVSS 3.1
AVNACHPRNUINSUCLILAN
EPSS
0.17%
6.9th percentile
Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN client implementations disable Go standard TLS server verification and replace it with custom peer-certificate verification logic. That replacement verifier does not anchor trust in the configured CA certificate. Instead, it constructs the verification root set from certificates supplied by the peer during the handshake, so the configured CA is parsed but not used as the trust anchor for the final verification decision.
In OVN-enabled deployments that use these SSL database connection paths, an attacker able to impersonate or intercept the OVN endpoint on the management network can present a rogue self-signed certificate chain, and Incus will accept this certificate as valid. This issue defeats the intended CA-based trust model for OVN database connections and permits endpoint impersonation by an active attacker in a suitable network position. This issue is fixed in version 7.0.0.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| github.com | lxc_incus_v6_cmd_incusd | >= 0 < 7.0.0 | 7.0.0 |
| linuxcontainers | incus | < 7.0.0 | 7.0.0 |
| lxc | incus | < 7.0.0 | 7.0.0 |
CVSS provenance
nvdv3.14.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
nvdv4.02.3LOWCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat5.5MEDIUM
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Bugzilla
CVE-2026-52961 kernel: ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
bugzilla·2026-06-24
CVE-2026-52961 [MEDIUM] CVE-2026-52961 kernel: ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
CVE-2026-52961 kernel: ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
In the Linux kernel, the following vulnerability has been resolved:
ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
The generic/642 test-case can reproduce the kernel crash:
[40243.605254] ------------[ cut here ]------------
[40243.605956] kernel BUG at fs/ceph/xattr.c:918!
[40243.607142] Oops: invalid opcode: 0000 [#1] SMP PTI
[40243.608067] CPU: 7 UID: 0 PID: 498762 Comm: kworker/7:1 Not tainted 7.0.0-rc7+ #3 PREEMPT(full)
[40243.609700] Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[40243.611820] Workqueue: ceph-msgr ceph_con_workfn
[40243.612715] RIP: 0010:__ceph_build_xattrs_blob+0x1b8/0x1e0
[4024
Bugzilla
CVE-2026-40243 incus: Incus: Authentication bypass due to broken OVN TLS validation [fedora-all]
bugzilla·2026-05-15·CVSS 2.3
CVE-2026-40243 [LOW] CVE-2026-40243 incus: Incus: Authentication bypass due to broken OVN TLS validation [fedora-all]
CVE-2026-40243 incus: Incus: Authentication bypass due to broken OVN TLS validation [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-40243 github.com/lxc/incus: incus: Incus: Authentication bypass due to broken OVN TLS validation
bugzilla·2026-05-06·CVSS 2.3
CVE-2026-40243 [LOW] CVE-2026-40243 github.com/lxc/incus: incus: Incus: Authentication bypass due to broken OVN TLS validation
CVE-2026-40243 github.com/lxc/incus: incus: Incus: Authentication bypass due to broken OVN TLS validation
Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN client implementations disable Go standard TLS server verification and replace it with custom peer-certificate verification logic. That replacement verifier does not anchor trust in the configured CA certificate. Instead, it constructs the verification root set from certificates supplied by the peer during the handshake, so the configured CA is parsed but not used as the trust anchor for the final verification decision.
In OVN-enabled deployments that use these SSL database conn
https://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icnb.gohttps://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_icsb.gohttps://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_nb.gohttps://github.com/lxc/incus/blob/v6.22.0/internal/server/network/ovn/ovn_sb.gohttps://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3https://github.com/lxc/incus/security/advisories/GHSA-c839-4qxr-j4x3
2026-05-06
Published