CIFSwitch — CIFS cifs.spnego key-origin LPE tracking site

Patch-status tracker for CIFSwitch, a Linux kernel local privilege escalation in the CIFS client: the kernel never validated that a cifs.spnego key description originated from kernel code, so an unprivileged user can forge one and steer the rootful cifs.upcall helper (from cifs-utils ≥ 6.14) into switching into an attacker-controlled namespace and loading an attacker-supplied NSS module — arbitrary code as root. Discovered by Asim Viladi Oglu Manizada and disclosed on 2026-05-27. Public PoC: https://github.com/manizada/CIFSwitch.

The canonical fix is Linux kernel mainline commit 3da1fdf4efbc, which adds a .vet_description hook that rejects forged key descriptions.

Tracked as CVE-2026-46243, assigned by the Linux kernel CNA on 2026-06-01.

The rendered site is published at https://kimmo.cloud/cifswitch/. Deployment plan and current setup state live in WEBSITE.md.

Source of truth

The tracker is a single Hugo page: site/content/_index.md. Edit that file; everything else is build infrastructure.

Local development

Requires Hugo extended (≥ 0.146.0) and Go (for Hugo Modules to fetch the PaperMod theme).

With Nix (recommended)

nix develop          # dev shell: hugo, go, git, resvg
cd site
hugo server          # local preview at http://localhost:1313/cifswitch/

If you use direnv, direnv allow once and the dev shell auto-activates whenever you cd into the repo.

Without Nix

Install Hugo extended ≥ 0.146.0 and Go ≥ 1.24 yourself, then:

cd site
hugo server          # http://localhost:1313/cifswitch/

Build and publish

make build       # local build into site/public/
make dist        # build, then rsync to haig:.www/sites/kimmo.cloud/htdocs/cifswitch/
make banner      # re-rasterise the social banner SVG → PNG (needs resvg + Roboto)

make dist runs make build first. make banner is only needed after editing site/assets/cifswitch-tracker.svg; the rendered PNG is committed.

Repo layout

.
├── flake.nix              # Nix dev environment (hugo, go, git, resvg + RPM tools)
├── .envrc                 # direnv hook → `use flake`
├── .gitignore
├── Makefile               # `make build`, `make dist`, `make banner`
├── LICENSE                # CC BY 4.0
├── README.md              # this file
├── CLAUDE.md              # project instructions for Claude Code
├── WEBSITE.md             # publication plan / decisions log
├── scripts/               # auto-update agent: prompt + driver
├── systemd/               # user-level timer + service units
└── site/                  # Hugo project
    ├── hugo.toml
    ├── content/
    │   └── _index.md      # the tracker (single page)
    ├── assets/css/extended/custom.css  # PaperMod CSS overrides
    ├── assets/cifswitch-tracker.svg    # social-banner source (→ make banner)
    ├── static/cifswitch-tracker.png    # rendered OpenGraph banner (committed)
    ├── layouts/partials/  # PaperMod overrides (post_meta, extend_footer)
    ├── go.mod, go.sum     # Hugo Modules — pulls PaperMod theme
    └── …                  # standard Hugo skeleton

License

CC BY 4.0 — share and adapt with attribution.