A flaw was found in KubeVirt's safepath package used by virt-handler. The OpenAtNoFollow function uses O_PATH|O_NOFOLLOW to obtain a file descriptor to a path leaf, but downstream operations resolve the path via /proc/self/fd/N using link-following syscalls. When the leaf is a symlink, the kernel dereferences it, defeating the intended no-follow protection. An attacker with access to a virt-launcher pod can exploit this to redirect virt-handler's IPC socket connections, including the notify socket used for VM domain lifecycle events. By hijacking this socket, the attacker can inject arbitrary domain events into virt-handler, causing it to take incorrect lifecycle actions, corrupt VM state in the Kubernetes API, or crash — resulting in sustained denial of VM management services for all virtual machines on the affected node. Additionally, the same symlink following flaw allows virt-handler to apply file ownership or permission changes to unintended host paths.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21590-1 advisory.

    Update to version 1.8.4.

    Security issues fixed:

    - CVE-2026-13201: virt-handler-rhel9: kubevirt: safepath `OpenAtNoFollow` symlink following via     `/proc/self/fd` allows       host file metadata modification (bsc#1269093).
    - CVE-2026-13622: virt-handler migration proxy follows symlinks and allows container escape to host     (bsc#1272840).
    - CVE-2026-25680, CVE-2026-25681, CVE-2026-27136, CVE-2026-42502, CVE-2026-42506: golang.org/x/net/html:
    multiple issues       when parsing HTML files (bsc#1267120).
    - CVE-2026-33814: golang.org/x/net/http2: processing of HTTP/2 SETTINGS frames with a crafted     `SETTINGS_MAX_FRAME_SIZE`       can lead to an infinite loop and a denial of service (bsc#1265736).
    - CVE-2026-35469: github.com/moby/spdystream: improper validation of attacker-controlled input in the     SPDY/3 frame       parser allows for a denial of service via crafted SPDY frames (bsc#1262265).
    - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for     validation       bypass and privilege escalation (bsc#1266575).
    - CVE-2026-39827, CVE-2026-39828, CVE-2026-39829, CVE-2026-39830, CVE-2026-39831, CVE-2026-39832,     CVE-2026-39833,       CVE-2026-39834, CVE-2026-39835, CVE-2026-42508, CVE-2026-46595, CVE-2026-46597, CVE-2026-46598:
      golang.org/x/crypto/ssh: multiple issues in `x/crypto/ssh` (bsc#1266151).
    - CVE-2026-46600: parsing of invalid SVCB or HTTPS RR when the size of a parameter value overflows the     message buffer       can lead to panic (bsc#1273606).
    - CVE-2026-56852: improper handling of truncated/invalid UTF-8 input can lead to an infinite loop     (bsc#1272011).

     Other updates and bugfixes:

    - Fix the release manifests' image references (bsc#1272604).
    - Add a `libguestfs-tools` subpackage.
    - Build with Go >= 1.25 (required by `golang.org/x/net` 0.55).
    - Version 1.8.4:
      * node-labeller: use new `libvirt` flags for full feature expansion.
      * Fix gRPC connection leak in `GetLauncherClient`; clean up ghost launcher record on connection setup     failure.
      * api: validate `VMI VSOCK CID` and checksum status fields as `uint32`.
      * virt-operator: refine canary flow to fully support out-of-band changes.
      * New `virt-api`/`virt-handler`/`virt-operator` ready and down metrics, alerts and recording rules.
    - Refresh `disks-images-provider.yaml` to the v1.8.4 image tag.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3630-1 advisory.

    - CVE-2025-47911: golang.org/x/net/html: algorithms that have quadratic complexity when parsing HTML     documents allow       for denial of service (bsc#1251420).
    - CVE-2025-47914: golang.org/x/crypto/ssh/agent: no validation of message size when processing new     identity requests       can cause a panic due to an out-of-bounds read (bsc#1254014).
    - CVE-2025-58181: golang.org/x/crypto/ssh: no validation of number of mechanisms in GSSAPI authentication     requests can       cause unbounded memory consumption (bsc#1253935).
    - CVE-2025-58190: golang.org/x/net/html: excessive memory consumption by `html.ParseFragment` when     processing specially       crafted input can lead to a denial of service (bsc#1251615).
    - CVE-2026-13201: virt-handler-rhel9: kubevirt: safepath `OpenAtNoFollow` symlink following via     `/proc/self/fd` allows       host file metadata modification (bsc#1269093).
    - CVE-2026-13622: virt-handler migration proxy follows symlinks and allows container escape to host     (bsc#1272840).
    - CVE-2026-25680,CVE-2026-25681,CVE-2026-27136,CVE-2026-42502,CVE-2026-42506: golang.org/x/net/html:
    multiple issues       when parsing HTML files (bsc#1267120).
    - CVE-2026-33814: golang.org/x/net/http2: processing of HTTP/2 SETTINGS frames with a crafted     `SETTINGS_MAX_FRAME_SIZE`       can lead to an infinite loop and a denial of service (bsc#1265736).
    - CVE-2026-35469: github.com/moby/spdystream: improper validation of attacker-controlled input in the     SPDY/3 frame       parser allows for a denial of service via crafted SPDY frames (bsc#1262265).
    - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for     validation       bypass and privilege escalation (bsc#1266575).
    - CVE-2026-46600: parsing of invalid SVCB or HTTPS RR when the size of a parameter value overflows the     message buffer       can lead to panic (bsc#1273606).
    - CVE-2026-56852: improper handling of truncated/invalid UTF-8 input can lead to an infinite loop     (bsc#1272000).

    Other updates and bugfixes:

    - Fixed `printf`-style calls with non-constant format strings (`cmd/virt-chroot`, `tests/`) that fail     `go1.25`'s vet       (toolchain required by the `x/net` 0.55.0 re-vendor); rewritten with no behavior change.
    - Build with Go >= 1.25 (required by `golang.org/x/net` 0.55).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3480-1 advisory.

    - Security update correcting a CVE over-claim from the previous       update, verified by auditing the fix code actually present in the       vendored tree:

      * CVE-2026-39821 (bsc#1266575): the previous entry claimed this         fixed by the golang.org/x/net v0.55.0 re-vendor, but 0.55.0's         idna fix is compile-time gated on Unicode 16 tables, which only         exist for go1.27+ - it is inert in our go1.25 builds, so the         claim was incorrect. Re-vendor golang.org/x/net v0.55.0 ->         v0.57.0, whose idna package rejects all-ASCII Punycode labels         unconditionally; the CVE is now actually fixed.

    - Re-vendor golang.org/x/text v0.37.0 -> v0.40.0: CVE-2026-56852       (bsc#1271661), infinite loop on invalid input in unicode/norm.

    - golang.org/x/crypto v0.52.0 -> v0.54.0 (pulled in by x/net 0.57.0;
      no additional CVE claims, all previously listed x/crypto fixes       remain included).

    - CVE-2026-13201 (bsc#1269093), safepath resolves a path whose last       component is a symlink without detecting it, allowing metadata       operations via /proc/self/fd to act on the symlink target.
      Backports of upstream release-1.7 commits 9ecda4ad5e and       1494cee849.
    - x/net 0.57.0 also contains the fix for CVE-2026-46600       (bsc#1272415) in dns/dnsmessage; kubevirt does not vendor that       package (not affected), the bump merely rides past it.

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
338629	openSUSE 16: kubevirt1.8-container-disk / kubevirt1.8-libguestfs-tools / etc (openSUSE-SU-2026:21590-1)	Nessus	SuSE Local Security Checks	Local	high
337974	SUSE SLES15 Security Update : kubevirt-1.6, virt-api-container-1.6, virt-controller-container-1.6, virt-exportproxy-container-1.6, virt-exportserver-container-1.6, virt-handler-container-1.6, virt-launcher-container-1.6, virt-libguestfs-tools-container-1.6, virt-operator-container-1.6, virt-pr-helper-container-1.6, virt-synchronization-controller-container-1.6 (SUSE-SU-2026:3630-1)	Nessus	SuSE Local Security Checks	Local	high
332133	SUSE SLES15 Security Update : kubevirt (SUSE-SU-2026:3480-1)	Nessus	SuSE Local Security Checks	Local	high

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