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modules: add ptrace_pidfd (CVE-2026-46333, Qualys ptrace/pidfd_getfd cred-steal)

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New module for Qualys's 2026-05-20 disclosure: a __ptrace_may_access logic flaw leaves a process dropping privileges briefly reachable past its dumpable boundary; pidfd_getfd(2) steals root-opened fds / authenticated channels from it. Default-distro, no userns, arch-agnostic (fd-steal, no shellcode).

detect(): version-pinned, predates-gate at pidfd_getfd's 5.6 introduction; kernel_range from Debian backports (5.10.251/6.1.172/6.12.88/7.0.7), drift-check clean. exploit(): spawns a setuid victim, pidfd_open()s it, sweeps pidfd_getfd() over its fd table during the cred-drop window, reports any uid-0-owned fd captured from a non-root context. Honest EXPLOIT_FAIL without a euid-0 witness; not yet VM-verified. mitigate(): yama ptrace_scope=2; cleanup() reverts. auditd/sigma/falco rules, NOTICE.md (Qualys TRU credit) + MODULE.md, safety rank 84.

Wiring: registry, Makefile, cve_metadata (+JSON source), verify-vm/targets.yaml (ubuntu2204 + mainline 5.15.5 target, sweep pending). Docs: README + CVES.md + docs/index.html counts 39->40 modules / 34->35 CVEs; added to not-yet-verified lists + corpus pill.
This commit is contained in:
KaraZajac
2026-06-02 08:26:24 -04:00
parent 1663df69d1
commit bd63aabd64
14 changed files with 647 additions and 30 deletions
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tools/verify-vm/targets.yaml
+10
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@@ -284,3 +284,13 @@ nft_pipapo:
kernel_version: "5.15.5"
expect_detect: VULNERABLE
notes: "CVE-2024-26581; nft_pipapo destroy-race (Notselwyn II). Same mainline 5.15.5 target as nf_tables works here — 5.15.5 is below the 5.15.149 backport. (Switched from apt-pinned 5.15.0-43 after that package was removed from Ubuntu repos.) Userns gate must be open (sysctl kernel.unprivileged_userns_clone=1)."
# ── ptrace_pidfd (CVE-2026-46333) addition ──────────────────────────
ptrace_pidfd:
box: ubuntu2204
kernel_pkg: ""
mainline_version: "5.15.5" # >5.6 (has pidfd_getfd) and below every fix backport
kernel_version: "5.15.5"
expect_detect: VULNERABLE
notes: "CVE-2026-46333; __ptrace_may_access dumpable-race credential-fd theft via pidfd_getfd. Qualys disclosure 2026-05-20, fixed 2026-05-14 mainline (Debian backports 5.10.251 / 6.1.172 / 6.12.88 / 7.0.7). Mainline 5.15.5 carries the pidfd_getfd vector (added 5.6) and is below every fix backport, so detect() returns VULNERABLE; installed via kernel.ubuntu.com/mainline/v5.15.5/ (same box/kernel as nf_tables / af_unix_gc / nft_pipapo). Brand-new addition this cycle: exploit() fires the real pidfd_getfd steal primitive and reports a captured root-owned fd, but the full target-specific root-pop is not yet VM-verified — sweep pending."