CVE-2026-43027

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_helper: pass helper to expect cleanup nf_conntrack_helper_unregister() calls nf_ct_expect_iterate_destroy() to remove expectations belonging to the helper being unregistered. However, it passes NULL instead of the helper pointer as the data argument, so expect_iter_me() never matches any expectation and all of them survive the cleanup. After unregister returns, nfnl_cthelper_del() frees the helper object immediately. Subsequent expectation dumps or packet-driven init_conntrack() calls then dereferenc...

Affected product and versions

Product

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

Affected versions

>= ac7b848390036dadd4351899d2a23748075916bd < 5cf28d5c8dcbbe8af6d3b145babe491906d7bad1, >= ac7b848390036dadd4351899d2a23748075916bd < 504ba4168466c91210c45acdc332479cfd5f2da6, >= ac7b848390036dadd4351899d2a23748075916bd < dc1739eff48e34cc71d4e2f03715493fbcebd8af, >= ac7b848390036dadd4351899d2a23748075916bd < 2cf2737c85a2ba2b52024dafe68ffad2676f97be, >= ac7b848390036dadd4351899d2a23748075916bd < 2c16e4d64dd91227742dfe196a3e7b0568bef65a, >= ac7b848390036dadd4351899d2a23748075916bd < 620f3d14c1ef51d425060a3056ad8dbae8f998a3, >= ac7b848390036dadd4351899d2a23748075916bd < 90bd7e8501349db3006d21fbc09df9ffcb172965, >= ac7b848390036dadd4351899d2a23748075916bd < a242a9ae58aa46ff7dae51ce64150a93957abe65, >= 4.14, >= V3.1.6, >= V3.1.5, >= 4.14 < 5.10.253, >= 5.11 < 5.15.203, >= 5.16 < 6.1.168, >= 6.2 < 6.6.134, >= 6.7 < 6.12.81, >= 6.13 < 6.18.22, >= 6.19 < 6.19.12, 7.0

Fixed versions

5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-416