CVE-2026-43027None▾ SunlitIn 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…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · 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: 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 dereference the freed exp->helper, causing a use-after-free.
Pass the actual helper pointer so expectations referencing it are properly destroyed before the helper object is freed.
BUG: KASAN: slab-use-after-free in string+0x38f/0x430 Read of size 1 at addr ffff888003b14d20 by task poc/103 Call Trace: string+0x38f/0x430 vsnprintf+0x3cc/0x1170 seq_printf+0x17a/0x240 exp_seq_show+0x2e5/0x560 seq_read_iter+0x419/0x1280 proc_reg_read+0x1ac/0x270 vfs_read+0x179/0x930 ksys_read+0xef/0x1c0 Freed by task 103: The buggy address is located 32 bytes inside of freed 192-byte region [ffff888003b14d00, ffff888003b14dc0)
Linux >= ac7b848390036dadd4351899d2a23748075916bd < 5cf28d5c8dcbbe8af6d3b145babe491906d7bad1Linux >= ac7b848390036dadd4351899d2a23748075916bd < 504ba4168466c91210c45acdc332479cfd5f2da6Linux >= ac7b848390036dadd4351899d2a23748075916bd < dc1739eff48e34cc71d4e2f03715493fbcebd8afLinux >= ac7b848390036dadd4351899d2a23748075916bd < 2cf2737c85a2ba2b52024dafe68ffad2676f97beLinux >= ac7b848390036dadd4351899d2a23748075916bd < 2c16e4d64dd91227742dfe196a3e7b0568bef65aLinux >= ac7b848390036dadd4351899d2a23748075916bd < 620f3d14c1ef51d425060a3056ad8dbae8f998a3Linux >= ac7b848390036dadd4351899d2a23748075916bd < 90bd7e8501349db3006d21fbc09df9ffcb172965Linux >= ac7b848390036dadd4351899d2a23748075916bd < a242a9ae58aa46ff7dae51ce64150a93957abe65Linux 4.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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