{"cve":"CVE-2026-43025","nvd":{"published":"2026-05-01T15:16:46.903","modified":"2026-10-19T20:18:00.853","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ctnetlink: ignore explicit helper on new expectations\n\nUse the existing master conntrack helper, anything else is not really\nsupported and it just makes validation more complicated, so just ignore\nwhat helper userspace suggests for this expectation.\n\nThis was uncovered when validating CTA_EXPECT_CLASS via different helper\nprovided by userspace than the existing master conntrack helper:\n\n  BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0\n  Read of size 4 at addr ffff8880043fe408 by task poc/102\n  Call Trace:\n   nf_ct_expect_related_report+0x2479/0x27c0\n   ctnetlink_create_expect+0x22b/0x3b0\n   ctnetlink_new_expect+0x4bd/0x5c0\n   nfnetlink_rcv_msg+0x67a/0x950\n   netlink_rcv_skb+0x120/0x350\n\nAllowing to read kernel memory bytes off the expectation boundary.\n\nCTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace\nvia netlink dump.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H","score":7.3},"cwes":["CWE-125"],"references":["https://git.kernel.org/stable/c/0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cd","https://git.kernel.org/stable/c/187b6ec5229ea93cb04c4f6d3b52efc80f513d0d","https://git.kernel.org/stable/c/21a04c31db4057deec85fcd6cc63d720b38819c3","https://git.kernel.org/stable/c/2ea0f35f235f70c133ad61fe05ba013753b978c6","https://git.kernel.org/stable/c/917b61fa2042f11e2af4c428e43f08199586633a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-43025","score":0.00128,"percentile":0.02461,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}