modules: add ghostlock (CVE-2026-43499, "GhostLock" rtmutex/futex requeue-PI stack UAF)

Adds the ghostlock module for CVE-2026-43499 ("GhostLock", VEGA / Nebula
Security's "IonStack part II") — a ~15-year race UAF on kernel STACK memory in
the rtmutex/futex requeue-PI path (kernel/locking/rtmutex.c). On the -EDEADLK
deadlock-rollback, remove_waiter() runs against `current` instead of the waiter
task, so a concurrent sched_setattr()-driven PI-chain priority walk on another
CPU clears pi_blocked_on on the wrong task and leaves an on-stack rt_mutex_waiter
dangling. Reachable by any unprivileged user (CVSS 7.8, PR:L) — plain
futex(2) + sched_setattr(2), no userns/CONFIG beyond CONFIG_FUTEX_PI. The
corpus's first rtmutex/futex-PI module and first kernel-stack UAF (all others
are heap/slab).

Introduced 2.6.39; fixed 3bfdc63936dd (7.1-rc1), stable backports
7.0.4 / 6.18.27 / 6.12.86 / 6.6.140 / 6.1.175; 5.15/5.10/5.4/4.19 affected with
no upstream fix. CWE-416; not in KEV.

detect() is a pure version gate over the five-branch backport table. exploit()
forks an isolated child that (A) deterministically confirms the -EDEADLK
remove_waiter() rollback path is reachable (safe — no concurrent walk means no
dangling pointer; validated on real hardware) then (B) exercises the actual race
a hard-bounded 24 iters / 2s with a sibling-CPU sched_setattr(SCHED_BATCH) storm,
and stops. Deliberately under-driven: no copy_from_user widening, no stack-frame
spray/reoccupation, and the KernelSnitch leak -> forged-waiter ->
fops/ashmem/pipe R/W -> cred-patch chain (Android/Pixel-specific, per-build
offsets) is NOT bundled. Returns EXPLOIT_FAIL. Lowest --auto safety rank (11) —
a won race corrupts the kernel stack. Unlike most races it ships a real
detection signature (futex requeue-PI returning EDEADLK + sibling sched_setattr);
auditd/sigma anchor on sched_setattr, falco/eBPF on the EDEADLK tell; no yara.

Wired: registry, Makefile, safety rank 11, version 0.9.13, 9 detect() test rows
(incl. 6.13.0 -> VULNERABLE, the multi-branch "newer than all" case), CVE
metadata (CWE-416 / T1068 / not-KEV; cve_metadata.c + KEV_CROSSREF.md regenerated
-> 13 of 40), README + CVES.md + website counts (45 modules / 40 CVEs),
RELEASE_NOTES v0.9.13, verify-vm target. Also corrects pre-existing
docs/index.html drift left by v0.9.12 (body counts stuck at 43/38 and a missing
bad_epoll corpus pill). Tests: 33 kernel_range + 101 detect, all pass.

Credit: VEGA / Nebula Security (nebusec.ai, NebuSec/CyberMeowfia, Apache-2.0);
upstream fix 3bfdc63936dd (Keenan Dong / Thomas Gleixner).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KUq4DGXSPBmPkAyJ9WnM9n

README.md

@@ -5,7 +5,7 @@
 [![Modules](https://img.shields.io/badge/CVEs-28%20VM--verified%20%2F%2039-brightgreen.svg)](docs/VERIFICATIONS.jsonl)
 [![Platform: Linux](https://img.shields.io/badge/platform-linux-lightgrey.svg)](#)
 
-> **One curated binary. 44 Linux LPE modules covering 39 CVEs from 2016 → 2026.
+> **One curated binary. 45 Linux LPE modules covering 40 CVEs from 2016 → 2026.
 > Every year 2016 → 2026 covered. 28 confirmed end-to-end against real Linux
 > VMs via `tools/verify-vm/`. Detection rules in the box. One command picks
 > the safest one and runs it.**
@@ -45,9 +45,9 @@ for every CVE in the bundle — same project for red and blue teams.
 
 ## Corpus at a glance
 
-**44 modules covering 39 distinct CVEs** across the 2016 → 2026 LPE
-timeline. **28 of the 39 CVEs have been empirically verified** in real
-Linux VMs via `tools/verify-vm/`; the 11 still-pending entries are
+**45 modules covering 40 distinct CVEs** across the 2016 → 2026 LPE
+timeline. **28 of the 40 CVEs have been empirically verified** in real
+Linux VMs via `tools/verify-vm/`; the 12 still-pending entries are
 blocked by their target environment (legacy hypervisor, EOL kernel, or
 the t64-transition libc rollout) or are brand-new additions awaiting a
 VM sweep, not by missing code.
@@ -68,7 +68,7 @@ af_packet · af_packet2 · af_unix_gc · cls_route4 · fuse_legacy ·
 nf_tables · nft_set_uaf · nft_fwd_dup · nft_payload ·
 netfilter_xtcompat · stackrot · sudo_samedit · sequoia · vmwgfx
 
-### Empirical verification (28 of 39 CVEs)
+### Empirical verification (28 of 40 CVEs)
 
 Records in [`docs/VERIFICATIONS.jsonl`](docs/VERIFICATIONS.jsonl) prove
 each verdict against a known-target VM. Coverage:
@@ -81,7 +81,7 @@ each verdict against a known-target VM. Coverage:
 | Debian 11 (5.10 stock) | cgroup_release_agent · fuse_legacy · netfilter_xtcompat · nft_fwd_dup |
 | Debian 12 (6.1 stock + udisks2 / polkit allow rule) | pack2theroot · udisks_libblockdev |
 
-**Not yet verified (11):** `vmwgfx` (VMware-guest-only — no public Vagrant
+**Not yet verified (12):** `vmwgfx` (VMware-guest-only — no public Vagrant
 box), `dirty_cow` (needs ≤ 4.4 kernel — older than every supported box),
 `mutagen_astronomy` (mainline 4.14.70 kernel-panics on Ubuntu 18.04
 rootfs — needs CentOS 6 / Debian 7), `pintheft` & `vsock_uaf` (kernel
@@ -93,7 +93,9 @@ kernel .debs depend on the t64-transition libs from Ubuntu 24.04+/Debian
 pending), `cifswitch` (detect + `add_key` primitive VM-verified; full chain
 + patched-kernel discriminator pending), `nft_catchall` (reconstructed
 kernel-UAF trigger, not VM-verified), `bad_epoll` (reconstructed epoll
-race trigger — deliberately under-driven, not VM-verified). All eleven are
+race trigger — deliberately under-driven, not VM-verified), `ghostlock`
+(reconstructed rtmutex/futex-PI stack-UAF trigger — deliberately
+under-driven, not VM-verified). All twelve are
 flagged in
 [`tools/verify-vm/targets.yaml`](tools/verify-vm/targets.yaml) with rationale.
 
@@ -141,7 +143,7 @@ uid=1000(kara) gid=1000(kara) groups=1000(kara)
 $ skeletonkey --auto --i-know
 [*] auto: host=demo distro=ubuntu/24.04 kernel=5.15.0-56-generic arch=x86_64
 [*] auto: active probes enabled — brief /tmp file touches and fork-isolated namespace probes
-[*] auto: scanning 44 modules for vulnerabilities...
+[*] auto: scanning 45 modules for vulnerabilities...
 [+] auto: dirty_pipe             VULNERABLE (safety rank 90)
 [+] auto: cgroup_release_agent   VULNERABLE (safety rank 98)
 [+] auto: pwnkit                 VULNERABLE (safety rank 100)
@@ -210,24 +212,24 @@ also compile (modules with Linux-only headers stub out gracefully).
 
 ## Status
 
-**v0.9.12 cut 2026-07-04.** 44 modules across 39 CVEs — **every
-year 2016 → 2026 now covered**. Newest: `bad_epoll` (CVE-2026-46242,
-Jaeyoung Chung's "Bad Epoll" — a race use-after-free in `fs/eventpoll.c`
-where `ep_remove()` clears `file->f_ep` under `f_lock` but keeps using the
-file while a concurrent `__fput()` frees the still-referenced
-`struct eventpoll`; reachable by **any unprivileged user with no user
-namespace**, weaponised via cross-cache + `/proc/self/fdinfo` arb-read;
-kernelCTF public PoC — shipped as a deliberately under-driven, reconstructed
-reachability trigger with the corpus's lowest `--auto` safety rank),
-`nft_catchall` (CVE-2026-23111,
-the nf_tables `nft_map_catchall_activate` abort-path UAF — an inverted
-condition frees a chain still referenced by a catch-all GOTO map element;
-public reproduction by FuzzingLabs), `cifswitch` (CVE-2026-46243,
-Asim Manizada's "CIFSwitch" — the `cifs.spnego` key type trusts
-userspace-forged authority fields, coercing the root `cifs.upcall` helper
-into loading an attacker NSS module as root), and `ptrace_pidfd`
-(CVE-2026-46333, Qualys's `__ptrace_may_access` / `pidfd_getfd`
-credential-steal).
+**v0.9.13 cut 2026-07-13.** 45 modules across 40 CVEs — **every
+year 2016 → 2026 now covered**. Newest: `ghostlock` (CVE-2026-43499,
+VEGA / Nebula Security's "GhostLock" — a ~15-year rtmutex/futex requeue-PI
+use-after-free on **kernel stack** memory where `remove_waiter()` clears
+`pi_blocked_on` on the wrong task during the `-EDEADLK` deadlock-rollback,
+raced by a sibling-CPU `sched_setattr()` priority walk; reachable by **any
+unprivileged user with no user namespace**; VEGA / Nebula kernelCTF public
+PoC ($92k, ~97% stable) — shipped as a deliberately under-driven,
+reconstructed trigger anchored on a safe `-EDEADLK` reachability witness
+with the corpus's lowest `--auto` safety rank), `bad_epoll` (CVE-2026-46242,
+Jaeyoung Chung's "Bad Epoll" — a race UAF in `fs/eventpoll.c` reachable by
+any unprivileged user with no user namespace; kernelCTF public PoC),
+`nft_catchall` (CVE-2026-23111, the nf_tables `nft_map_catchall_activate`
+abort-path UAF — an inverted condition frees a chain still referenced by a
+catch-all GOTO map element; public reproduction by FuzzingLabs), and
+`cifswitch` (CVE-2026-46243, Asim Manizada's "CIFSwitch" — the
+`cifs.spnego` key type trusts userspace-forged authority fields, coercing
+the root `cifs.upcall` helper into loading an attacker NSS module as root).
 v0.9.0 added 5 gap-fillers
 (`mutagen_astronomy` / `sudo_runas_neg1` / `tioscpgrp` / `vsock_uaf` /
 `nft_pipapo`); v0.8.0 added 3 (`sudo_chwoot` / `udisks_libblockdev` /
@@ -257,13 +259,13 @@ Reliability + accuracy work in v0.7.x:
   trace, OPSEC footprint, detection-rule coverage, verified-on
   records. Paste-into-ticket ready.
 - **CVE metadata pipeline** (`tools/refresh-cve-metadata.py`) — fetches
-  CISA KEV catalog + NVD CWE; 13 of 39 modules cover KEV-listed CVEs.
+  CISA KEV catalog + NVD CWE; 13 of 40 modules cover KEV-listed CVEs.
 - **151 detection rules** across auditd / sigma / yara / falco; one
   command exports the corpus to your SIEM.
 - `--auto` upgrades: per-detect 15s timeout, fork-isolated detect +
   exploit, structured verdict table, scan summary, `--dry-run`.
 
-Not yet verified (11 of 39 CVEs): `vmwgfx` (VMware-guest only),
+Not yet verified (12 of 40 CVEs): `vmwgfx` (VMware-guest only),
 `dirty_cow` (needs ≤ 4.4 kernel), `mutagen_astronomy` (mainline
 4.14.70 panics on Ubuntu 18.04 rootfs — needs CentOS 6 / Debian 7),
 `pintheft` + `vsock_uaf` (kernel modules not autoloaded on common
@@ -272,7 +274,9 @@ libs from Ubuntu 24.04+ / Debian 13+), `ptrace_pidfd` + `sudo_host`
 + `cifswitch` (cifswitch detect + primitive VM-verified; full chain
 pending) + `nft_catchall` (reconstructed kernel-UAF trigger, not
 VM-verified) + `bad_epoll` (reconstructed epoll race trigger,
-deliberately under-driven, not VM-verified). Rationale in
+deliberately under-driven, not VM-verified) + `ghostlock` (reconstructed
+rtmutex/futex-PI stack-UAF trigger, deliberately under-driven, not
+VM-verified). Rationale in
 [`tools/verify-vm/targets.yaml`](tools/verify-vm/targets.yaml).
 
 See [`ROADMAP.md`](ROADMAP.md) for the next planned modules and