CVE-2026-43025High· 7.3▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: netfilter: ctnetlink: ignore explicit helper on new expectations Use the existing master conntrack helper, anything else is not really supported and it just makes vali…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
netfilter: ctnetlink: ignore explicit helper on new expectations
Use the existing master conntrack helper, anything else is not really supported and it just makes validation more complicated, so just ignore what helper userspace suggests for this expectation.
This was uncovered when validating CTA_EXPECT_CLASS via different helper provided by userspace than the existing master conntrack helper:
BUG: KASAN: slab-out-of-bounds in nf_ct_expect_related_report+0x2479/0x27c0 Read of size 4 at addr ffff8880043fe408 by task poc/102 Call Trace: nf_ct_expect_related_report+0x2479/0x27c0 ctnetlink_create_expect+0x22b/0x3b0 ctnetlink_new_expect+0x4bd/0x5c0 nfnetlink_rcv_msg+0x67a/0x950 netlink_rcv_skb+0x120/0x350
Allowing to read kernel memory bytes off the expectation boundary.
CTA_EXPECT_HELP_NAME is still used to offer the helper name to userspace via netlink dump.
Linux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < e135f8e8212cbed12a03ab8dec77fa1247139897Linux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < 2ea0f35f235f70c133ad61fe05ba013753b978c6Linux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < 0f6c33697ccfac6499d0b7a4dbdec5d3a3a566cdLinux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < 187b6ec5229ea93cb04c4f6d3b52efc80f513d0dLinux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < 21a04c31db4057deec85fcd6cc63d720b38819c3Linux >= bd0779370588386e4a67ba5d0b176cfded8e6a53 < 917b61fa2042f11e2af4c428e43f08199586633aLinux 3.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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